Using Rotary Encoders with Arduino interrupts

Tutorial showing how to use Rotary Encoders and making you realise how different they are from Rotary potentiometers

Oct 16, 2022

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rotary encoder

Components and supplies

Custom 7 seg display

Arduino Nano R3

Rotary Encoder

Apps and platforms

Arduino IDE

Project description

Code

Controlling custom 7 segment display (shift register driven) with Rotary encoder

arduino

1int DS1_pin = 6;
2int STCP1_pin =9;
3int SHCP1_pin = 8 ;
4int DT_pin  = 5;
5
6int counter=0;
7unsigned long last_run=0;
8
9int digits [10][8]{
10  {0,1,1,1,1,1,1,0}, // digit 0
11  {0,0,1,1,0,0,0,0}, // digit 1
12  {0,1,1,0,1,1,0,1},  // digit 2
13  {0,1,1,1,1,0,0,1}, // digit 3
14  {0,0,1,1,0,0,1,1}, // digit 4
15  {0,1,0,1,1,0,1,1}, // digit 5
16  {0,1,0,1,1,1,1,1}, // digit 6
17  {0,1,1,1,0,0,0,0},  // digit 7
18  {0,1,1,1,1,1,1,1}, // digit 8
19  {0,1,1,1,1,0,1,1}  // digit 9
20};
21
22
23void  DisplayDigit(int Digit)
24{
25    digitalWrite(STCP1_pin,LOW);
26    for (int  i = 7; i>=0; i--)
27   {
28    digitalWrite(SHCP1_pin,LOW);
29    if (digits[Digit][i]==1)  digitalWrite(DS1_pin, LOW); 
30    if (digits[Digit][i]==0) digitalWrite(DS1_pin,  HIGH);
31    digitalWrite(SHCP1_pin,HIGH);
32   }
33   digitalWrite(STCP1_pin,  HIGH); 
34}
35
36void shaft_moved(){
37  if (millis()-last_run>5){
38    if  (digitalRead(4)==1){
39      if (counter<9) counter++; 
40    }
41    if (digitalRead(4)==0){
42      if(counter>0) counter--; 
43    }
44  last_run=millis();
45  }
46}
47
48void  reset_to_0(){
49  counter=0;
50}
51
52void setup() {  
53  pinMode(DS1_pin,  OUTPUT);
54  pinMode(STCP1_pin, OUTPUT);
55  pinMode(SHCP1_pin, OUTPUT);
56  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, LOW);
57  attachInterrupt(digitalPinToInterrupt(2), reset_to_0, FALLING);
58  pinMode(2,INPUT_PULLUP);
59  pinMode(DT_pin,INPUT);
60}
61
62void loop() {  
63  DisplayDigit(counter);  
64}

int DS1_pin = 6;
int STCP1_pin =9;
int SHCP1_pin = 8 ;
int DT_pin  = 5;

int counter=0;
unsigned long last_run=0;

int digits [10][8]{
  {0,1,1,1,1,1,1,0}, // digit 0
  {0,0,1,1,0,0,0,0}, // digit 1
  {0,1,1,0,1,1,0,1},  // digit 2
  {0,1,1,1,1,0,0,1}, // digit 3
  {0,0,1,1,0,0,1,1}, // digit 4
  {0,1,0,1,1,0,1,1}, // digit 5
  {0,1,0,1,1,1,1,1}, // digit 6
  {0,1,1,1,0,0,0,0},  // digit 7
  {0,1,1,1,1,1,1,1}, // digit 8
  {0,1,1,1,1,0,1,1}  // digit 9
};


void  DisplayDigit(int Digit)
{
    digitalWrite(STCP1_pin,LOW);
    for (int  i = 7; i>=0; i--)
   {
    digitalWrite(SHCP1_pin,LOW);
    if (digits[Digit][i]==1)  digitalWrite(DS1_pin, LOW); 
    if (digits[Digit][i]==0) digitalWrite(DS1_pin,  HIGH);
    digitalWrite(SHCP1_pin,HIGH);
   }
   digitalWrite(STCP1_pin,  HIGH); 
}

void shaft_moved(){
  if (millis()-last_run>5){
    if  (digitalRead(4)==1){
      if (counter<9) counter++; 
    }
    if (digitalRead(4)==0){
      if(counter>0) counter--; 
    }
  last_run=millis();
  }
}

void  reset_to_0(){
  counter=0;
}

void setup() {  
  pinMode(DS1_pin,  OUTPUT);
  pinMode(STCP1_pin, OUTPUT);
  pinMode(SHCP1_pin, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, LOW);
  attachInterrupt(digitalPinToInterrupt(2), reset_to_0, FALLING);
  pinMode(2,INPUT_PULLUP);
  pinMode(DT_pin,INPUT);
}

void loop() {  
  DisplayDigit(counter);  
}

Rotary encoder. Limiting the counter range to 5 to 10.

arduino

1int counter=5;
2String dir="";
3unsigned long last_run=0;
4
5
6void  setup() {
7  Serial.begin(9600);
8  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, FALLING);
9  pinMode(4,INPUT);
10}
11
12void shaft_moved(){
13  if (millis()-last_run>5){
14    if (digitalRead(4)==1){
15      if(counter<10)  counter++;
16      dir="CW";
17      }
18    if (digitalRead(4)==0){
19      if  (counter>5) counter--; 
20      dir="CCW";}
21    last_run=millis();
22  }
23}
24
25void  loop() {
26  Serial.print("counter : ");
27  Serial.print(counter);
28  Serial.print("  direction : ");
29  Serial.println(dir);  
30}

int counter=5;
String dir="";
unsigned long last_run=0;


void  setup() {
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, FALLING);
  pinMode(4,INPUT);
}

void shaft_moved(){
  if (millis()-last_run>5){
    if (digitalRead(4)==1){
      if(counter<10)  counter++;
      dir="CW";
      }
    if (digitalRead(4)==0){
      if  (counter>5) counter--; 
      dir="CCW";}
    last_run=millis();
  }
}

void  loop() {
  Serial.print("counter : ");
  Serial.print(counter);
  Serial.print("  direction : ");
  Serial.println(dir);  
}

Recognising position and direction of the Rotary Encoder and displaying it in Serial Monitor

arduino

1int counter=0;
2String dir="";
3unsigned long last_run=0;
4
5
6void  setup() {
7  Serial.begin(9600);
8  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, FALLING);
9  pinMode(4,INPUT);
10}
11
12void shaft_moved(){
13  if (millis()-last_run>5){
14    if (digitalRead(4)==1){
15      counter++;
16      dir="CW";
17      }
18    if (digitalRead(4)==0){
19      counter--;  
20      dir="CCW";}
21    last_run=millis();
22  }
23}
24
25void loop()  {
26  Serial.print("counter : ");
27  Serial.print(counter);
28  Serial.print("  direction : ");
29  Serial.println(dir);  
30}

int counter=0;
String dir="";
unsigned long last_run=0;


void  setup() {
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(3),  shaft_moved, FALLING);
  pinMode(4,INPUT);
}

void shaft_moved(){
  if (millis()-last_run>5){
    if (digitalRead(4)==1){
      counter++;
      dir="CW";
      }
    if (digitalRead(4)==0){
      counter--;  
      dir="CCW";}
    last_run=millis();
  }
}

void loop()  {
  Serial.print("counter : ");
  Serial.print(counter);
  Serial.print("  direction : ");
  Serial.println(dir);  
}

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