Simple Wireless Keyboard for PC

Keyboard designed specifically for YouTube and Netflix on a PC. Works great with music players as well.

Mar 7, 2018

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entertainment system

remote control

hid

Components and supplies

SparkFun Transceiver Breakout - nRF24L01+

Arduino Pro Mini 328 - 5V/16MHz

Arduino Micro

Apps and platforms

Fusion 360

Arduino IDE

Project description

Code

Remote.ino

arduino

Code for the transmitter

1#include <SPI.h>
2#include <NRFLite.h>
3#include "Arduino.h"
4#include  <avr/sleep.h>
5#include <avr/power.h>
6#include "RF24.h"
7
8volatile bool  input = true;
9bool YTmode = true;
10long startTime;
11int lowBattery = 740;     //Low battery level (740 = 3.65V)
12
13const static uint8_t RADIO_ID = 21;             // Our radio's id.
14const static uint8_t DESTINATION_RADIO_ID = 7;  // Id of the radio we will transmit to.
15const static uint8_t PIN_RADIO_CE = 9;
16const  static uint8_t PIN_RADIO_CSN = 10;
17
18struct RadioPacket // Any packet up to  32 bytes can be sent.
19{
20    uint8_t FromRadioId;
21    uint32_t OnTimeMillis;
22    uint32_t FailedTxCount;
23};
24
25RF24 radio(9,10);
26NRFLite _radio;
27RadioPacket  _radioData;
28
29void setup()
30{
31    //Serial.begin(115200);
32
33    pinMode(2,  INPUT);            //interrupt
34    pinMode(3, INPUT);     //mode Button
35    pinMode(4,  INPUT);     //volume down button
36    pinMode(5, INPUT);     //volume up button
37    pinMode(6, INPUT);     //previous button
38    pinMode(7, INPUT);     //next  button
39    pinMode(8, INPUT);     //play button
40/*
41Radio    Arduino
42CE    -> 9
43CSN   -> 10 (Hardware SPI SS)
44MOSI  -> 11 (Hardware SPI MOSI)
45MISO  -> 12 (Hardware SPI MISO)
46SCK   -> 13 (Hardware SPI SCK)
47IRQ   -> No connection
48VCC   -> No more than 3.6 volts
49GND   -> GND
50*/
51    pinMode(14, INPUT);    //rewind  button
52    pinMode(15, INPUT);    //skip button
53    pinMode(16,OUTPUT);           //backlight  LED
54    pinMode(17,OUTPUT);           //blue LED
55    pinMode(18,OUTPUT);           //red  LED
56
57    checkBattery();                                               //checks  battery status
58    initRadio();                                                  //initialization  of radio
59    _radioData.FromRadioId = RADIO_ID;
60    sendButton(0);
61    modeStatus();
62    attachInterrupt(digitalPinToInterrupt(2), isr, FALLING);      //Interrupt setup
63}
64
65void  loop() {
66  if(input){          //only occurs during isr method which is interrupt
67    checkButtons(); 
68    delay(10);  
69  }
70  enterSleep();       //puts  arduino to sleep to save power
71}
72
73
74void checkButtons(){        //Scans  which button is pressed and sends message
75  startTime = millis();
76  digitalWrite(16,HIGH);    //backlight on
77  checkBattery();           //makes sure battery isn't low
78  modeStatus();             //Lights up the mode LEDs(youtube / media)
79  radio.powerUp();          //wakes up radio from sleep
80  int message = 0;          //message will  be send at the of the method
81  
82  while(millis()-startTime < 3000){  //runs  for 3 seconds
83    message = 0;
84    if(digitalRead(4)) {
85      delay(3);                   //debouncing
86      while(digitalRead(4)){}     //debouncing
87      delay(3);                   //debouncing
88      message = 4;                //sets  message that is going to be send
89      startTime = millis();       //resets timer
90    } else if
91    (digitalRead(5)) {
92      delay(3);
93      while(digitalRead(5)){}
94      delay(3);
95      message = 5;
96      startTime = millis();
97    }else  if (digitalRead(6)) {
98      delay(10);
99      while(digitalRead(6)){}
100      delay(10);
101      message = 6;
102      startTime = millis();
103    }else if (digitalRead(7))  {
104      delay(10);
105      while(digitalRead(7)){}
106      delay(10);
107      message  = 7;
108      startTime = millis();
109    }
110    else if (digitalRead(8)) {
111      delay(10);
112      while(digitalRead(8)){}
113      delay(10);
114      message  = 8;
115      startTime = millis();
116    }else if (digitalRead(14)) {
117      delay(10);
118      while(digitalRead(14)){}
119      delay(10);
120      message = 14;
121      startTime  = millis();
122    }else if (digitalRead(15)) {
123      delay(10);
124      while(digitalRead(15)){}
125      delay(10);
126      message = 15;
127      startTime = millis();
128    }else  if (digitalRead(3)) {
129      delay(10);
130      while(digitalRead(3)){}
131      delay(10);
132      changeMode();             //changes between youtube and media mode
133      startTime  = millis();
134    }
135
136    if(message == 0){}                  //checks if  there is any message
137    else if(YTmode)sendButton(message); //in youtube mode  message gets send normally
138    else sendButton(message + 100);     //in media  mode message is incremented by 100
139    delay(10);
140  }
141  digitalWrite(16,LOW);                 //turns off backlight
142  radio.powerDown();                    //Puts  radio to sleep
143  input =false;                         //prevents from looping
144}
145
146void  sendButton(int buttonIndex){     //send data over radio
147
148    _radioData.OnTimeMillis  = buttonIndex;
149
150    if (_radio.send(DESTINATION_RADIO_ID, &_radioData, sizeof(_radioData)))  // Note how '&' must be placed in front of the variable name.
151    {
152       //  Serial.println("...Success");
153    }
154    else
155    {
156       // Serial.println("...Failed");
157        _radioData.FailedTxCount++;
158    }
159}
160
161void isr(){                       //called  when interrupt happens which wakes up arduino from sleep
162  input = true;
163}
164
165void  enterSleep(){              //Puts arduino to sleep to save power
166  digitalWrite(16,LOW);   //Turns off all LEDs
167  digitalWrite(17,LOW);
168  digitalWrite(18,LOW);
169  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
170  sleep_enable();
171  sleep_mode();
172  //waits until woken up
173  sleep_disable();
174  power_all_enable();
175}
176
177void  changeMode(){            //Changes between youtube and media mode
178  delay(10);
179  while (digitalRead(3)){}
180  delay(10);
181  YTmode = !YTmode;
182  if(YTmode)  {
183    digitalWrite(17,LOW);
184    digitalWrite(18,HIGH);
185  }else{
186    digitalWrite(17,HIGH);
187    digitalWrite(18,LOW);
188  }
189}
190
191void initRadio(){     //initialization  of radio
192   if (!_radio.init(RADIO_ID, PIN_RADIO_CE, PIN_RADIO_CSN)) //if radio  can't be found turn on all LEDs and do nothing.
193    {
194        digitalWrite(16,HIGH);
195        digitalWrite(17,HIGH);
196        digitalWrite(18,HIGH); 
197        while  (1); // Wait here forever.
198    }
199}
200
201void modeStatus(){
202  if(YTmode)  {                        //setting the mode LED
203      digitalWrite(17,LOW);
204      digitalWrite(18,HIGH);
205    }else{
206      digitalWrite(17,HIGH);
207      digitalWrite(18,LOW);
208    }
209}
210
211void checkBattery(){                  //makes sure battery isn't  too low
212  if (analogRead(A5) < lowBattery){   //if battery is too low blink couple  of times
213    for(int i=0; i<=4; i++){
214      digitalWrite(16,LOW);
215      delay(200);
216      digitalWrite(16,HIGH);
217      delay(200);
218    }
219    detachInterrupt(0);           // detach interrupt and go to sleep. Arduino cannot be woken after this  point. only reset will make it work
220    enterSleep();
221  }
222}
223
224

#include <SPI.h>
#include <NRFLite.h>
#include "Arduino.h"
#include  <avr/sleep.h>
#include <avr/power.h>
#include "RF24.h"

volatile bool  input = true;
bool YTmode = true;
long startTime;
int lowBattery = 740;     //Low battery level (740 = 3.65V)

const static uint8_t RADIO_ID = 21;             // Our radio's id.
const static uint8_t DESTINATION_RADIO_ID = 7;  // Id of the radio we will transmit to.
const static uint8_t PIN_RADIO_CE = 9;
const  static uint8_t PIN_RADIO_CSN = 10;

struct RadioPacket // Any packet up to  32 bytes can be sent.
{
    uint8_t FromRadioId;
    uint32_t OnTimeMillis;
    uint32_t FailedTxCount;
};

RF24 radio(9,10);
NRFLite _radio;
RadioPacket  _radioData;

void setup()
{
    //Serial.begin(115200);

    pinMode(2,  INPUT);            //interrupt
    pinMode(3, INPUT);     //mode Button
    pinMode(4,  INPUT);     //volume down button
    pinMode(5, INPUT);     //volume up button
    pinMode(6, INPUT);     //previous button
    pinMode(7, INPUT);     //next  button
    pinMode(8, INPUT);     //play button
/*
Radio    Arduino
CE    -> 9
CSN   -> 10 (Hardware SPI SS)
MOSI  -> 11 (Hardware SPI MOSI)
MISO  -> 12 (Hardware SPI MISO)
SCK   -> 13 (Hardware SPI SCK)
IRQ   -> No connection
VCC   -> No more than 3.6 volts
GND   -> GND
*/
    pinMode(14, INPUT);    //rewind  button
    pinMode(15, INPUT);    //skip button
    pinMode(16,OUTPUT);           //backlight  LED
    pinMode(17,OUTPUT);           //blue LED
    pinMode(18,OUTPUT);           //red  LED

    checkBattery();                                               //checks  battery status
    initRadio();                                                  //initialization  of radio
    _radioData.FromRadioId = RADIO_ID;
    sendButton(0);
    modeStatus();
    attachInterrupt(digitalPinToInterrupt(2), isr, FALLING);      //Interrupt setup
}

void  loop() {
  if(input){          //only occurs during isr method which is interrupt
    checkButtons(); 
    delay(10);  
  }
  enterSleep();       //puts  arduino to sleep to save power
}


void checkButtons(){        //Scans  which button is pressed and sends message
  startTime = millis();
  digitalWrite(16,HIGH);    //backlight on
  checkBattery();           //makes sure battery isn't low
  modeStatus();             //Lights up the mode LEDs(youtube / media)
  radio.powerUp();          //wakes up radio from sleep
  int message = 0;          //message will  be send at the of the method
  
  while(millis()-startTime < 3000){  //runs  for 3 seconds
    message = 0;
    if(digitalRead(4)) {
      delay(3);                   //debouncing
      while(digitalRead(4)){}     //debouncing
      delay(3);                   //debouncing
      message = 4;                //sets  message that is going to be send
      startTime = millis();       //resets timer
    } else if
    (digitalRead(5)) {
      delay(3);
      while(digitalRead(5)){}
      delay(3);
      message = 5;
      startTime = millis();
    }else  if (digitalRead(6)) {
      delay(10);
      while(digitalRead(6)){}
      delay(10);
      message = 6;
      startTime = millis();
    }else if (digitalRead(7))  {
      delay(10);
      while(digitalRead(7)){}
      delay(10);
      message  = 7;
      startTime = millis();
    }
    else if (digitalRead(8)) {
      delay(10);
      while(digitalRead(8)){}
      delay(10);
      message  = 8;
      startTime = millis();
    }else if (digitalRead(14)) {
      delay(10);
      while(digitalRead(14)){}
      delay(10);
      message = 14;
      startTime  = millis();
    }else if (digitalRead(15)) {
      delay(10);
      while(digitalRead(15)){}
      delay(10);
      message = 15;
      startTime = millis();
    }else  if (digitalRead(3)) {
      delay(10);
      while(digitalRead(3)){}
      delay(10);
      changeMode();             //changes between youtube and media mode
      startTime  = millis();
    }

    if(message == 0){}                  //checks if  there is any message
    else if(YTmode)sendButton(message); //in youtube mode  message gets send normally
    else sendButton(message + 100);     //in media  mode message is incremented by 100
    delay(10);
  }
  digitalWrite(16,LOW);                 //turns off backlight
  radio.powerDown();                    //Puts  radio to sleep
  input =false;                         //prevents from looping
}

void  sendButton(int buttonIndex){     //send data over radio

    _radioData.OnTimeMillis  = buttonIndex;

    if (_radio.send(DESTINATION_RADIO_ID, &_radioData, sizeof(_radioData)))  // Note how '&' must be placed in front of the variable name.
    {
       //  Serial.println("...Success");
    }
    else
    {
       // Serial.println("...Failed");
        _radioData.FailedTxCount++;
    }
}

void isr(){                       //called  when interrupt happens which wakes up arduino from sleep
  input = true;
}

void  enterSleep(){              //Puts arduino to sleep to save power
  digitalWrite(16,LOW);   //Turns off all LEDs
  digitalWrite(17,LOW);
  digitalWrite(18,LOW);
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  sleep_enable();
  sleep_mode();
  //waits until woken up
  sleep_disable();
  power_all_enable();
}

void  changeMode(){            //Changes between youtube and media mode
  delay(10);
  while (digitalRead(3)){}
  delay(10);
  YTmode = !YTmode;
  if(YTmode)  {
    digitalWrite(17,LOW);
    digitalWrite(18,HIGH);
  }else{
    digitalWrite(17,HIGH);
    digitalWrite(18,LOW);
  }
}

void initRadio(){     //initialization  of radio
   if (!_radio.init(RADIO_ID, PIN_RADIO_CE, PIN_RADIO_CSN)) //if radio  can't be found turn on all LEDs and do nothing.
    {
        digitalWrite(16,HIGH);
        digitalWrite(17,HIGH);
        digitalWrite(18,HIGH); 
        while  (1); // Wait here forever.
    }
}

void modeStatus(){
  if(YTmode)  {                        //setting the mode LED
      digitalWrite(17,LOW);
      digitalWrite(18,HIGH);
    }else{
      digitalWrite(17,HIGH);
      digitalWrite(18,LOW);
    }
}

void checkBattery(){                  //makes sure battery isn't  too low
  if (analogRead(A5) < lowBattery){   //if battery is too low blink couple  of times
    for(int i=0; i<=4; i++){
      digitalWrite(16,LOW);
      delay(200);
      digitalWrite(16,HIGH);
      delay(200);
    }
    detachInterrupt(0);           // detach interrupt and go to sleep. Arduino cannot be woken after this  point. only reset will make it work
    enterSleep();
  }
}

Remote.ino

arduino

Code for the transmitter

1#include <SPI.h>
2#include <NRFLite.h>
3#include "Arduino.h"
4#include
5  <avr/sleep.h>
6#include <avr/power.h>
7#include "RF24.h"
8
9volatile bool
10  input = true;
11bool YTmode = true;
12long startTime;
13int lowBattery = 740;
14     //Low battery level (740 = 3.65V)
15
16const static uint8_t RADIO_ID = 21;
17             // Our radio's id.
18const static uint8_t DESTINATION_RADIO_ID = 7;
19  // Id of the radio we will transmit to.
20const static uint8_t PIN_RADIO_CE = 9;
21const
22  static uint8_t PIN_RADIO_CSN = 10;
23
24struct RadioPacket // Any packet up to
25  32 bytes can be sent.
26{
27    uint8_t FromRadioId;
28    uint32_t OnTimeMillis;
29
30    uint32_t FailedTxCount;
31};
32
33RF24 radio(9,10);
34NRFLite _radio;
35RadioPacket
36  _radioData;
37
38void setup()
39{
40    //Serial.begin(115200);
41
42    pinMode(2,
43  INPUT);            //interrupt
44    pinMode(3, INPUT);     //mode Button
45    pinMode(4,
46  INPUT);     //volume down button
47    pinMode(5, INPUT);     //volume up button
48
49    pinMode(6, INPUT);     //previous button
50    pinMode(7, INPUT);     //next
51  button
52    pinMode(8, INPUT);     //play button
53/*
54Radio    Arduino
55CE
56    -> 9
57CSN   -> 10 (Hardware SPI SS)
58MOSI  -> 11 (Hardware SPI MOSI)
59MISO
60  -> 12 (Hardware SPI MISO)
61SCK   -> 13 (Hardware SPI SCK)
62IRQ   -> No connection
63VCC
64   -> No more than 3.6 volts
65GND   -> GND
66*/
67    pinMode(14, INPUT);    //rewind
68  button
69    pinMode(15, INPUT);    //skip button
70    pinMode(16,OUTPUT);           //backlight
71  LED
72    pinMode(17,OUTPUT);           //blue LED
73    pinMode(18,OUTPUT);           //red
74  LED
75
76    checkBattery();                                               //checks
77  battery status
78    initRadio();                                                  //initialization
79  of radio
80    _radioData.FromRadioId = RADIO_ID;
81    sendButton(0);
82    modeStatus();
83
84    attachInterrupt(digitalPinToInterrupt(2), isr, FALLING);      //Interrupt setup
85}
86
87void
88  loop() {
89  if(input){          //only occurs during isr method which is interrupt
90
91    checkButtons(); 
92    delay(10);  
93  }
94  enterSleep();       //puts
95  arduino to sleep to save power
96}
97
98
99void checkButtons(){        //Scans
100  which button is pressed and sends message
101  startTime = millis();
102  digitalWrite(16,HIGH);
103    //backlight on
104  checkBattery();           //makes sure battery isn't low
105
106  modeStatus();             //Lights up the mode LEDs(youtube / media)
107  radio.powerUp();
108          //wakes up radio from sleep
109  int message = 0;          //message will
110  be send at the of the method
111  
112  while(millis()-startTime < 3000){  //runs
113  for 3 seconds
114    message = 0;
115    if(digitalRead(4)) {
116      delay(3);
117                   //debouncing
118      while(digitalRead(4)){}     //debouncing
119
120      delay(3);                   //debouncing
121      message = 4;                //sets
122  message that is going to be send
123      startTime = millis();       //resets timer
124
125    } else if
126    (digitalRead(5)) {
127      delay(3);
128      while(digitalRead(5)){}
129
130      delay(3);
131      message = 5;
132      startTime = millis();
133    }else
134  if (digitalRead(6)) {
135      delay(10);
136      while(digitalRead(6)){}
137      delay(10);
138
139      message = 6;
140      startTime = millis();
141    }else if (digitalRead(7))
142  {
143      delay(10);
144      while(digitalRead(7)){}
145      delay(10);
146      message
147  = 7;
148      startTime = millis();
149    }
150    else if (digitalRead(8)) {
151
152      delay(10);
153      while(digitalRead(8)){}
154      delay(10);
155      message
156  = 8;
157      startTime = millis();
158    }else if (digitalRead(14)) {
159      delay(10);
160
161      while(digitalRead(14)){}
162      delay(10);
163      message = 14;
164      startTime
165  = millis();
166    }else if (digitalRead(15)) {
167      delay(10);
168      while(digitalRead(15)){}
169
170      delay(10);
171      message = 15;
172      startTime = millis();
173    }else
174  if (digitalRead(3)) {
175      delay(10);
176      while(digitalRead(3)){}
177      delay(10);
178
179      changeMode();             //changes between youtube and media mode
180      startTime
181  = millis();
182    }
183
184    if(message == 0){}                  //checks if
185  there is any message
186    else if(YTmode)sendButton(message); //in youtube mode
187  message gets send normally
188    else sendButton(message + 100);     //in media
189  mode message is incremented by 100
190    delay(10);
191  }
192  digitalWrite(16,LOW);
193                 //turns off backlight
194  radio.powerDown();                    //Puts
195  radio to sleep
196  input =false;                         //prevents from looping
197}
198
199void
200  sendButton(int buttonIndex){     //send data over radio
201
202    _radioData.OnTimeMillis
203  = buttonIndex;
204
205    if (_radio.send(DESTINATION_RADIO_ID, &_radioData, sizeof(_radioData)))
206  // Note how '&' must be placed in front of the variable name.
207    {
208       //
209  Serial.println("...Success");
210    }
211    else
212    {
213       // Serial.println("...Failed");
214
215        _radioData.FailedTxCount++;
216    }
217}
218
219void isr(){                       //called
220  when interrupt happens which wakes up arduino from sleep
221  input = true;
222}
223
224void
225  enterSleep(){              //Puts arduino to sleep to save power
226  digitalWrite(16,LOW);
227   //Turns off all LEDs
228  digitalWrite(17,LOW);
229  digitalWrite(18,LOW);
230
231  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
232  sleep_enable();
233  sleep_mode();
234
235  //waits until woken up
236  sleep_disable();
237  power_all_enable();
238}
239
240void
241  changeMode(){            //Changes between youtube and media mode
242  delay(10);
243
244  while (digitalRead(3)){}
245  delay(10);
246  YTmode = !YTmode;
247  if(YTmode)
248  {
249    digitalWrite(17,LOW);
250    digitalWrite(18,HIGH);
251  }else{
252    digitalWrite(17,HIGH);
253
254    digitalWrite(18,LOW);
255  }
256}
257
258void initRadio(){     //initialization
259  of radio
260   if (!_radio.init(RADIO_ID, PIN_RADIO_CE, PIN_RADIO_CSN)) //if radio
261  can't be found turn on all LEDs and do nothing.
262    {
263        digitalWrite(16,HIGH);
264
265        digitalWrite(17,HIGH);
266        digitalWrite(18,HIGH); 
267        while
268  (1); // Wait here forever.
269    }
270}
271
272void modeStatus(){
273  if(YTmode)
274  {                        //setting the mode LED
275      digitalWrite(17,LOW);
276
277      digitalWrite(18,HIGH);
278    }else{
279      digitalWrite(17,HIGH);
280      digitalWrite(18,LOW);
281
282    }
283}
284
285void checkBattery(){                  //makes sure battery isn't
286  too low
287  if (analogRead(A5) < lowBattery){   //if battery is too low blink couple
288  of times
289    for(int i=0; i<=4; i++){
290      digitalWrite(16,LOW);
291      delay(200);
292
293      digitalWrite(16,HIGH);
294      delay(200);
295    }
296    detachInterrupt(0);
297           // detach interrupt and go to sleep. Arduino cannot be woken after this
298  point. only reset will make it work
299    enterSleep();
300  }
301}
302
303

#include <SPI.h>
#include <NRFLite.h>
#include "Arduino.h"
#include
  <avr/sleep.h>
#include <avr/power.h>
#include "RF24.h"

volatile bool
  input = true;
bool YTmode = true;
long startTime;
int lowBattery = 740;
     //Low battery level (740 = 3.65V)

const static uint8_t RADIO_ID = 21;
             // Our radio's id.
const static uint8_t DESTINATION_RADIO_ID = 7;
  // Id of the radio we will transmit to.
const static uint8_t PIN_RADIO_CE = 9;
const
  static uint8_t PIN_RADIO_CSN = 10;

struct RadioPacket // Any packet up to
  32 bytes can be sent.
{
    uint8_t FromRadioId;
    uint32_t OnTimeMillis;

    uint32_t FailedTxCount;
};

RF24 radio(9,10);
NRFLite _radio;
RadioPacket
  _radioData;

void setup()
{
    //Serial.begin(115200);

    pinMode(2,
  INPUT);            //interrupt
    pinMode(3, INPUT);     //mode Button
    pinMode(4,
  INPUT);     //volume down button
    pinMode(5, INPUT);     //volume up button

    pinMode(6, INPUT);     //previous button
    pinMode(7, INPUT);     //next
  button
    pinMode(8, INPUT);     //play button
/*
Radio    Arduino
CE
    -> 9
CSN   -> 10 (Hardware SPI SS)
MOSI  -> 11 (Hardware SPI MOSI)
MISO
  -> 12 (Hardware SPI MISO)
SCK   -> 13 (Hardware SPI SCK)
IRQ   -> No connection
VCC
   -> No more than 3.6 volts
GND   -> GND
*/
    pinMode(14, INPUT);    //rewind
  button
    pinMode(15, INPUT);    //skip button
    pinMode(16,OUTPUT);           //backlight
  LED
    pinMode(17,OUTPUT);           //blue LED
    pinMode(18,OUTPUT);           //red
  LED

    checkBattery();                                               //checks
  battery status
    initRadio();                                                  //initialization
  of radio
    _radioData.FromRadioId = RADIO_ID;
    sendButton(0);
    modeStatus();

    attachInterrupt(digitalPinToInterrupt(2), isr, FALLING);      //Interrupt setup
}

void
  loop() {
  if(input){          //only occurs during isr method which is interrupt

    checkButtons(); 
    delay(10);  
  }
  enterSleep();       //puts
  arduino to sleep to save power
}


void checkButtons(){        //Scans
  which button is pressed and sends message
  startTime = millis();
  digitalWrite(16,HIGH);
    //backlight on
  checkBattery();           //makes sure battery isn't low

  modeStatus();             //Lights up the mode LEDs(youtube / media)
  radio.powerUp();
          //wakes up radio from sleep
  int message = 0;          //message will
  be send at the of the method
  
  while(millis()-startTime < 3000){  //runs
  for 3 seconds
    message = 0;
    if(digitalRead(4)) {
      delay(3);
                   //debouncing
      while(digitalRead(4)){}     //debouncing

      delay(3);                   //debouncing
      message = 4;                //sets
  message that is going to be send
      startTime = millis();       //resets timer

    } else if
    (digitalRead(5)) {
      delay(3);
      while(digitalRead(5)){}

      delay(3);
      message = 5;
      startTime = millis();
    }else
  if (digitalRead(6)) {
      delay(10);
      while(digitalRead(6)){}
      delay(10);

      message = 6;
      startTime = millis();
    }else if (digitalRead(7))
  {
      delay(10);
      while(digitalRead(7)){}
      delay(10);
      message
  = 7;
      startTime = millis();
    }
    else if (digitalRead(8)) {

      delay(10);
      while(digitalRead(8)){}
      delay(10);
      message
  = 8;
      startTime = millis();
    }else if (digitalRead(14)) {
      delay(10);

      while(digitalRead(14)){}
      delay(10);
      message = 14;
      startTime
  = millis();
    }else if (digitalRead(15)) {
      delay(10);
      while(digitalRead(15)){}

      delay(10);
      message = 15;
      startTime = millis();
    }else
  if (digitalRead(3)) {
      delay(10);
      while(digitalRead(3)){}
      delay(10);

      changeMode();             //changes between youtube and media mode
      startTime
  = millis();
    }

    if(message == 0){}                  //checks if
  there is any message
    else if(YTmode)sendButton(message); //in youtube mode
  message gets send normally
    else sendButton(message + 100);     //in media
  mode message is incremented by 100
    delay(10);
  }
  digitalWrite(16,LOW);
                 //turns off backlight
  radio.powerDown();                    //Puts
  radio to sleep
  input =false;                         //prevents from looping
}

void
  sendButton(int buttonIndex){     //send data over radio

    _radioData.OnTimeMillis
  = buttonIndex;

    if (_radio.send(DESTINATION_RADIO_ID, &_radioData, sizeof(_radioData)))
  // Note how '&' must be placed in front of the variable name.
    {
       //
  Serial.println("...Success");
    }
    else
    {
       // Serial.println("...Failed");

        _radioData.FailedTxCount++;
    }
}

void isr(){                       //called
  when interrupt happens which wakes up arduino from sleep
  input = true;
}

void
  enterSleep(){              //Puts arduino to sleep to save power
  digitalWrite(16,LOW);
   //Turns off all LEDs
  digitalWrite(17,LOW);
  digitalWrite(18,LOW);

  set_sleep_mode(SLEEP_MODE_PWR_DOWN);
  sleep_enable();
  sleep_mode();

  //waits until woken up
  sleep_disable();
  power_all_enable();
}

void
  changeMode(){            //Changes between youtube and media mode
  delay(10);

  while (digitalRead(3)){}
  delay(10);
  YTmode = !YTmode;
  if(YTmode)
  {
    digitalWrite(17,LOW);
    digitalWrite(18,HIGH);
  }else{
    digitalWrite(17,HIGH);

    digitalWrite(18,LOW);
  }
}

void initRadio(){     //initialization
  of radio
   if (!_radio.init(RADIO_ID, PIN_RADIO_CE, PIN_RADIO_CSN)) //if radio
  can't be found turn on all LEDs and do nothing.
    {
        digitalWrite(16,HIGH);

        digitalWrite(17,HIGH);
        digitalWrite(18,HIGH); 
        while
  (1); // Wait here forever.
    }
}

void modeStatus(){
  if(YTmode)
  {                        //setting the mode LED
      digitalWrite(17,LOW);

      digitalWrite(18,HIGH);
    }else{
      digitalWrite(17,HIGH);
      digitalWrite(18,LOW);

    }
}

void checkBattery(){                  //makes sure battery isn't
  too low
  if (analogRead(A5) < lowBattery){   //if battery is too low blink couple
  of times
    for(int i=0; i<=4; i++){
      digitalWrite(16,LOW);
      delay(200);

      digitalWrite(16,HIGH);
      delay(200);
    }
    detachInterrupt(0);
           // detach interrupt and go to sleep. Arduino cannot be woken after this
  point. only reset will make it work
    enterSleep();
  }
}

Receiver.ino

arduino

Code for the receiver

1#include <SPI.h>
2#include <NRFLite.h>
3#include "HID-Project.h"
4
5
6const  static uint8_t RADIO_ID = 7;       // Our radio's id.  The transmitter will send  to this id.
7const static uint8_t PIN_RADIO_CE = 9;
8const static uint8_t PIN_RADIO_CSN  = 10;
9
10struct RadioPacket // Any packet up to 32 bytes can be sent.
11{
12    uint8_t FromRadioId;
13    uint32_t OnTimeMillis;
14    uint32_t FailedTxCount;
15};
16
17NRFLite  _radio;
18RadioPacket _radioData;
19
20void setup()
21{
22    if (!_radio.init(RADIO_ID,  PIN_RADIO_CE, PIN_RADIO_CSN))  //Checks if radio is connected
23    {
24        while  (1); // Wait here forever.
25    }
26    Consumer.begin();       //initialization  of keyboard. Arduino will act as HID
27    pinMode(LED_BUILTIN, OUTPUT);
28}
29
30void  loop()
31{
32    while (_radio.hasData())          //when data is received over  radio
33    {
34        digitalWrite(LED_BUILTIN,HIGH);
35        _radio.readData(&_radioData);
36        int msg = _radioData.OnTimeMillis;    //saves received data in msg
37        bool  YTflag = true;                   //Determines youtube or media mode
38        if  (msg > 100) {                      //checks if the remote is in youtube or media  mode
39          YTflag = false;
40          msg -= 100;
41        }
42        switch(msg){                        //Outputs appropriate key presses as keyboard
43          case  4:
44          Consumer.write(MEDIA_VOLUME_DOWN);
45          break;
46          case  5:
47          Consumer.write(MEDIA_VOLUME_UP);
48          break;
49          case  6:
50          if (YTflag){
51            Keyboard.print("f");
52          }
53          else Consumer.write(MEDIA_PREVIOUS);
54          break;
55          case  7:
56          if (YTflag ){
57            Keyboard.press(KEY_LEFT_SHIFT);
58            Keyboard.press('n');
59            delay(50);
60            Keyboard.releaseAll();
61          }
62          else Consumer.write(MEDIA_NEXT);
63          break;
64          case 8:
65          if (YTflag) Keyboard.print("k");
66          else  {
67                //Consumer.write(MEDIA_PLAY_PAUSE);
68                Keyboard.print("  ");
69          }
70          break;
71          case 14:
72          if (YTflag)  Keyboard.print("j");
73          else Consumer.write(MEDIA_REWIND);
74          break;
75          case 15:
76          if (YTflag) Keyboard.print("l");
77          else  Consumer.write(MEDIA_FAST_FORWARD);
78          break;
79        }
80        digitalWrite(LED_BUILTIN,LOW);
81    }
82}
83

#include <SPI.h>
#include <NRFLite.h>
#include "HID-Project.h"


const  static uint8_t RADIO_ID = 7;       // Our radio's id.  The transmitter will send  to this id.
const static uint8_t PIN_RADIO_CE = 9;
const static uint8_t PIN_RADIO_CSN  = 10;

struct RadioPacket // Any packet up to 32 bytes can be sent.
{
    uint8_t FromRadioId;
    uint32_t OnTimeMillis;
    uint32_t FailedTxCount;
};

NRFLite  _radio;
RadioPacket _radioData;

void setup()
{
    if (!_radio.init(RADIO_ID,  PIN_RADIO_CE, PIN_RADIO_CSN))  //Checks if radio is connected
    {
        while  (1); // Wait here forever.
    }
    Consumer.begin();       //initialization  of keyboard. Arduino will act as HID
    pinMode(LED_BUILTIN, OUTPUT);
}

void  loop()
{
    while (_radio.hasData())          //when data is received over  radio
    {
        digitalWrite(LED_BUILTIN,HIGH);
        _radio.readData(&_radioData);
        int msg = _radioData.OnTimeMillis;    //saves received data in msg
        bool  YTflag = true;                   //Determines youtube or media mode
        if  (msg > 100) {                      //checks if the remote is in youtube or media  mode
          YTflag = false;
          msg -= 100;
        }
        switch(msg){                        //Outputs appropriate key presses as keyboard
          case  4:
          Consumer.write(MEDIA_VOLUME_DOWN);
          break;
          case  5:
          Consumer.write(MEDIA_VOLUME_UP);
          break;
          case  6:
          if (YTflag){
            Keyboard.print("f");
          }
          else Consumer.write(MEDIA_PREVIOUS);
          break;
          case  7:
          if (YTflag ){
            Keyboard.press(KEY_LEFT_SHIFT);
            Keyboard.press('n');
            delay(50);
            Keyboard.releaseAll();
          }
          else Consumer.write(MEDIA_NEXT);
          break;
          case 8:
          if (YTflag) Keyboard.print("k");
          else  {
                //Consumer.write(MEDIA_PLAY_PAUSE);
                Keyboard.print("  ");
          }
          break;
          case 14:
          if (YTflag)  Keyboard.print("j");
          else Consumer.write(MEDIA_REWIND);
          break;
          case 15:
          if (YTflag) Keyboard.print("l");
          else  Consumer.write(MEDIA_FAST_FORWARD);
          break;
        }
        digitalWrite(LED_BUILTIN,LOW);
    }
}

Downloadable files

Recevier

Schematic for the receiver. Fritzing file

Recevier

Transmitter

Schematic for the transmitter. Fritzing file

Transmitter

Recevier

Schematic for the receiver. Fritzing file

Recevier

Transmitter

Schematic for the transmitter. Fritzing file

Transmitter

Documentation

3D models

STL files of all parts

3D models

STL files of all parts

3D models

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