DIY WiFi Light Sensor

The purpose of this project is to create an IoT device with Arduino which sends data to ThingSpeak overWiFi.

Jul 29, 2018

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Devices & Components

Li-Ion Battery 1000mAh

Resistor 1k ohm

Single RGB Led

Slide Switch

Photo resistor

Adafruit Feather HUZZAH with ESP8266 WiFi

Resistor 2.21k ohm

Software & Tools

Arduino IDE

Project description

Code

Code snippet #1

csharp

1// Light Sensor data transmitted to ThingSpeak via Wifi<br>// Inspired   from the Hackster project : https://www.hackster.io/glicmich/adafruit-feather-huzzah-with-esp8266-wifi-8009d2</p><p>//   Librairies</p><p>#include <ESP8266Wifi.h>
2#include <WifiClient.h>
3#include   <ESP8266WebServer.h>
4#include <ESP8266mDNS.h>
5#include <ThingSpeak.h>
6                                
7const char* ssid = "your_ssid_box";               //   Wireless SID
8const char* password = "your_wifi_password";                //   Wireless Passcode</p><p>ESP8266WebServer server(80); // http server</p><p>// what   digital pin we're connected to
9int led_r= 13; // red led connected to the digital   pin 13
10int led_g = 12; // green led connected to the digital pin 12
11int led_b   = 14; // blue led connected to the digital pin 14</p><p>int luminosity = A0; //   photoresistor connected to the INPUT (analog pin 0)</p><p>WiFiClient  client;
12unsigned   int myChannelNumber = 546348;           // Channel Number from   // ThingSpeak IoT
13const   char * myWriteAPIKey = "***********";     // Write API Key
14                                                
15void   handleRoot() 
16    {</p><p>    delay(1000);
17    server.send(200, "text/plain",   "Hello world !");</p><p>    delay(1000);
18    }</p><p>void handleNotFound()
19     {</p><p>    String message = "File Not Found\
20\
21";
22    message += "URI:   ";
23    message += server.uri();
24    message += "\
25Method: ";
26    message   += (server.method() == HTTP_GET)?"GET":"POST";
27    message += "\
28Arguments:   ";
29    message += server.args();
30    message += "\
31";
32   
33    for   (uint8_t i=0; i</p><p>void setup(void)
34    {
35    Serial.println("AM2302 test!");
36     pinMode(led_r,OUTPUT);
37    pinMode(led_g,OUTPUT);
38    pinMode(led_b,OUTPUT);
39     digitalWrite(led_r,LOW);
40    digitalWrite(led_g,LOW);
41    digitalWrite(led_b,LOW);
42     pinMode(luminosity,INPUT);</p><p>    Serial.begin(115200);
43    WiFi.begin(ssid,   password);
44    ThingSpeak.begin(client);
45    Serial.println("");</p><p>   // Wait for connection
46    while (WiFi.status() != WL_CONNECTED) 
47        {
48         delay(500);
49        Serial.print(".");
50        // RGB red light
51         digitalWrite(led_r,HIGH);
52        digitalWrite(led_g,LOW);
53        digitalWrite(led_b,LOW);
54         }
55  
56    Serial.println("");
57    Serial.print("Connected to   ");
58    Serial.println(ssid);
59    Serial.print("IP address: ");
60    Serial.println(WiFi.localIP());
61     
62    if (MDNS.begin("esp8266")) 
63        {
64        Serial.println("MDNS   responder started");
65        }</p><p>    server.on("/", handleRoot);</p><p>     server.on("/inline", [](){
66    server.send(200, "text/plain", "this   works as well");
67  });</p><p>    server.onNotFound(handleNotFound);</p><p>    server.begin();
68     Serial.println("HTTP server started");
69    }</p><p>void loop(void)
70     {
71    server.handleClient();
72    // Blink led from white to blue
73    digitalWrite(led_r,HIGH);
74     digitalWrite(led_g,HIGH);
75    digitalWrite(led_b,HIGH);
76    delay(300);
77     digitalWrite(led_r,LOW);
78    digitalWrite(led_g,LOW);
79    digitalWrite(led_b,HIGH);
80     delay(300);
81    digitalWrite(led_r,HIGH);
82    digitalWrite(led_g,HIGH);
83     digitalWrite(led_b,HIGH);
84    delay(300);
85    digitalWrite(led_r,LOW);
86     digitalWrite(led_g,LOW);
87    digitalWrite(led_b,HIGH);
88    delay(300);
89     digitalWrite(led_r,HIGH);
90    digitalWrite(led_g,HIGH);
91    digitalWrite(led_b,HIGH);
92     delay(300);
93    digitalWrite(led_r,LOW);
94    digitalWrite(led_g,LOW);
95     digitalWrite(led_b,HIGH);
96    // Sensor reading 
97    luminosity = analogRead(A0);
98     // Light sensor in % / reverse in order to have 0% for LOW light and 100% for   high light
99    luminosity = 100 - map(luminosity,0,1024,0,100);
100    Serial.print(luminosity);
101     Serial.println(" %");
102    ThingSpeak.setField(1, luminosity); // Field   1 , sending the variable luminosity
103    ThingSpeak.writeFields(myChannelNumber,   myWriteAPIKey);
104    }

// Light Sensor data transmitted to ThingSpeak via Wifi<br>// Inspired   from the Hackster project : https://www.hackster.io/glicmich/adafruit-feather-huzzah-with-esp8266-wifi-8009d2</p><p>//   Librairies</p><p>#include <ESP8266Wifi.h>
#include <WifiClient.h>
#include   <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <ThingSpeak.h>
                                
const char* ssid = "your_ssid_box";               //   Wireless SID
const char* password = "your_wifi_password";                //   Wireless Passcode</p><p>ESP8266WebServer server(80); // http server</p><p>// what   digital pin we're connected to
int led_r= 13; // red led connected to the digital   pin 13
int led_g = 12; // green led connected to the digital pin 12
int led_b   = 14; // blue led connected to the digital pin 14</p><p>int luminosity = A0; //   photoresistor connected to the INPUT (analog pin 0)</p><p>WiFiClient  client;
unsigned   int myChannelNumber = 546348;           // Channel Number from   // ThingSpeak IoT
const   char * myWriteAPIKey = "***********";     // Write API Key
                                                
void   handleRoot() 
    {</p><p>    delay(1000);
    server.send(200, "text/plain",   "Hello world !");</p><p>    delay(1000);
    }</p><p>void handleNotFound()
     {</p><p>    String message = "File Not Found\
\
";
    message += "URI:   ";
    message += server.uri();
    message += "\
Method: ";
    message   += (server.method() == HTTP_GET)?"GET":"POST";
    message += "\
Arguments:   ";
    message += server.args();
    message += "\
";
   
    for   (uint8_t i=0; i</p><p>void setup(void)
    {
    Serial.println("AM2302 test!");
     pinMode(led_r,OUTPUT);
    pinMode(led_g,OUTPUT);
    pinMode(led_b,OUTPUT);
     digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,LOW);
     pinMode(luminosity,INPUT);</p><p>    Serial.begin(115200);
    WiFi.begin(ssid,   password);
    ThingSpeak.begin(client);
    Serial.println("");</p><p>   // Wait for connection
    while (WiFi.status() != WL_CONNECTED) 
        {
         delay(500);
        Serial.print(".");
        // RGB red light
         digitalWrite(led_r,HIGH);
        digitalWrite(led_g,LOW);
        digitalWrite(led_b,LOW);
         }
  
    Serial.println("");
    Serial.print("Connected to   ");
    Serial.println(ssid);
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
     
    if (MDNS.begin("esp8266")) 
        {
        Serial.println("MDNS   responder started");
        }</p><p>    server.on("/", handleRoot);</p><p>     server.on("/inline", [](){
    server.send(200, "text/plain", "this   works as well");
  });</p><p>    server.onNotFound(handleNotFound);</p><p>    server.begin();
     Serial.println("HTTP server started");
    }</p><p>void loop(void)
     {
    server.handleClient();
    // Blink led from white to blue
    digitalWrite(led_r,HIGH);
     digitalWrite(led_g,HIGH);
    digitalWrite(led_b,HIGH);
    delay(300);
     digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,HIGH);
     delay(300);
    digitalWrite(led_r,HIGH);
    digitalWrite(led_g,HIGH);
     digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,LOW);
     digitalWrite(led_g,LOW);
    digitalWrite(led_b,HIGH);
    delay(300);
     digitalWrite(led_r,HIGH);
    digitalWrite(led_g,HIGH);
    digitalWrite(led_b,HIGH);
     delay(300);
    digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
     digitalWrite(led_b,HIGH);
    // Sensor reading 
    luminosity = analogRead(A0);
     // Light sensor in % / reverse in order to have 0% for LOW light and 100% for   high light
    luminosity = 100 - map(luminosity,0,1024,0,100);
    Serial.print(luminosity);
     Serial.println(" %");
    ThingSpeak.setField(1, luminosity); // Field   1 , sending the variable luminosity
    ThingSpeak.writeFields(myChannelNumber,   myWriteAPIKey);
    }

Code snippet #1

csharp

1// Light Sensor data transmitted to ThingSpeak via Wifi<br>// Inspired  from the Hackster project : https://www.hackster.io/glicmich/adafruit-feather-huzzah-with-esp8266-wifi-8009d2</p><p>//  Librairies</p><p>#include <ESP8266Wifi.h>
2#include <WifiClient.h>
3#include  <ESP8266WebServer.h>
4#include <ESP8266mDNS.h>
5#include <ThingSpeak.h>
6                               
7const char* ssid = "your_ssid_box";               //  Wireless SID
8const char* password = "your_wifi_password";                //  Wireless Passcode</p><p>ESP8266WebServer server(80); // http server</p><p>// what  digital pin we're connected to
9int led_r= 13; // red led connected to the digital  pin 13
10int led_g = 12; // green led connected to the digital pin 12
11int led_b  = 14; // blue led connected to the digital pin 14</p><p>int luminosity = A0; //  photoresistor connected to the INPUT (analog pin 0)</p><p>WiFiClient  client;
12unsigned  int myChannelNumber = 546348;           // Channel Number from   // ThingSpeak IoT
13const  char * myWriteAPIKey = "***********";     // Write API Key
14                                                
15void  handleRoot() 
16    {</p><p>    delay(1000);
17    server.send(200, "text/plain",  "Hello world !");</p><p>    delay(1000);
18    }</p><p>void handleNotFound()
19    {</p><p>    String message = "File Not Found\
20\
21";
22    message += "URI:  ";
23    message += server.uri();
24    message += "\
25Method: ";
26    message  += (server.method() == HTTP_GET)?"GET":"POST";
27    message += "\
28Arguments:  ";
29    message += server.args();
30    message += "\
31";
32   
33    for  (uint8_t i=0; i</p><p>void setup(void)
34    {
35    Serial.println("AM2302 test!");
36    pinMode(led_r,OUTPUT);
37    pinMode(led_g,OUTPUT);
38    pinMode(led_b,OUTPUT);
39    digitalWrite(led_r,LOW);
40    digitalWrite(led_g,LOW);
41    digitalWrite(led_b,LOW);
42    pinMode(luminosity,INPUT);</p><p>    Serial.begin(115200);
43    WiFi.begin(ssid,  password);
44    ThingSpeak.begin(client);
45    Serial.println("");</p><p>  // Wait for connection
46    while (WiFi.status() != WL_CONNECTED) 
47        {
48        delay(500);
49        Serial.print(".");
50        // RGB red light
51        digitalWrite(led_r,HIGH);
52        digitalWrite(led_g,LOW);
53        digitalWrite(led_b,LOW);
54        }
55  
56    Serial.println("");
57    Serial.print("Connected to  ");
58    Serial.println(ssid);
59    Serial.print("IP address: ");
60    Serial.println(WiFi.localIP());
61    
62    if (MDNS.begin("esp8266")) 
63        {
64        Serial.println("MDNS  responder started");
65        }</p><p>    server.on("/", handleRoot);</p><p>    server.on("/inline", [](){
66    server.send(200, "text/plain", "this  works as well");
67  });</p><p>    server.onNotFound(handleNotFound);</p><p>    server.begin();
68    Serial.println("HTTP server started");
69    }</p><p>void loop(void)
70    {
71    server.handleClient();
72    // Blink led from white to blue
73    digitalWrite(led_r,HIGH);
74    digitalWrite(led_g,HIGH);
75    digitalWrite(led_b,HIGH);
76    delay(300);
77    digitalWrite(led_r,LOW);
78    digitalWrite(led_g,LOW);
79    digitalWrite(led_b,HIGH);
80    delay(300);
81    digitalWrite(led_r,HIGH);
82    digitalWrite(led_g,HIGH);
83    digitalWrite(led_b,HIGH);
84    delay(300);
85    digitalWrite(led_r,LOW);
86    digitalWrite(led_g,LOW);
87    digitalWrite(led_b,HIGH);
88    delay(300);
89    digitalWrite(led_r,HIGH);
90    digitalWrite(led_g,HIGH);
91    digitalWrite(led_b,HIGH);
92    delay(300);
93    digitalWrite(led_r,LOW);
94    digitalWrite(led_g,LOW);
95    digitalWrite(led_b,HIGH);
96    // Sensor reading 
97    luminosity = analogRead(A0);
98    // Light sensor in % / reverse in order to have 0% for LOW light and 100% for  high light
99    luminosity = 100 - map(luminosity,0,1024,0,100);
100    Serial.print(luminosity);
101    Serial.println(" %");
102    ThingSpeak.setField(1, luminosity); // Field  1 , sending the variable luminosity
103    ThingSpeak.writeFields(myChannelNumber,  myWriteAPIKey);
104    }

// Light Sensor data transmitted to ThingSpeak via Wifi<br>// Inspired  from the Hackster project : https://www.hackster.io/glicmich/adafruit-feather-huzzah-with-esp8266-wifi-8009d2</p><p>//  Librairies</p><p>#include <ESP8266Wifi.h>
#include <WifiClient.h>
#include  <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <ThingSpeak.h>
                               
const char* ssid = "your_ssid_box";               //  Wireless SID
const char* password = "your_wifi_password";                //  Wireless Passcode</p><p>ESP8266WebServer server(80); // http server</p><p>// what  digital pin we're connected to
int led_r= 13; // red led connected to the digital  pin 13
int led_g = 12; // green led connected to the digital pin 12
int led_b  = 14; // blue led connected to the digital pin 14</p><p>int luminosity = A0; //  photoresistor connected to the INPUT (analog pin 0)</p><p>WiFiClient  client;
unsigned  int myChannelNumber = 546348;           // Channel Number from   // ThingSpeak IoT
const  char * myWriteAPIKey = "***********";     // Write API Key
                                                
void  handleRoot() 
    {</p><p>    delay(1000);
    server.send(200, "text/plain",  "Hello world !");</p><p>    delay(1000);
    }</p><p>void handleNotFound()
    {</p><p>    String message = "File Not Found\
\
";
    message += "URI:  ";
    message += server.uri();
    message += "\
Method: ";
    message  += (server.method() == HTTP_GET)?"GET":"POST";
    message += "\
Arguments:  ";
    message += server.args();
    message += "\
";
   
    for  (uint8_t i=0; i</p><p>void setup(void)
    {
    Serial.println("AM2302 test!");
    pinMode(led_r,OUTPUT);
    pinMode(led_g,OUTPUT);
    pinMode(led_b,OUTPUT);
    digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,LOW);
    pinMode(luminosity,INPUT);</p><p>    Serial.begin(115200);
    WiFi.begin(ssid,  password);
    ThingSpeak.begin(client);
    Serial.println("");</p><p>  // Wait for connection
    while (WiFi.status() != WL_CONNECTED) 
        {
        delay(500);
        Serial.print(".");
        // RGB red light
        digitalWrite(led_r,HIGH);
        digitalWrite(led_g,LOW);
        digitalWrite(led_b,LOW);
        }
  
    Serial.println("");
    Serial.print("Connected to  ");
    Serial.println(ssid);
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    
    if (MDNS.begin("esp8266")) 
        {
        Serial.println("MDNS  responder started");
        }</p><p>    server.on("/", handleRoot);</p><p>    server.on("/inline", [](){
    server.send(200, "text/plain", "this  works as well");
  });</p><p>    server.onNotFound(handleNotFound);</p><p>    server.begin();
    Serial.println("HTTP server started");
    }</p><p>void loop(void)
    {
    server.handleClient();
    // Blink led from white to blue
    digitalWrite(led_r,HIGH);
    digitalWrite(led_g,HIGH);
    digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,HIGH);
    digitalWrite(led_g,HIGH);
    digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,HIGH);
    digitalWrite(led_g,HIGH);
    digitalWrite(led_b,HIGH);
    delay(300);
    digitalWrite(led_r,LOW);
    digitalWrite(led_g,LOW);
    digitalWrite(led_b,HIGH);
    // Sensor reading 
    luminosity = analogRead(A0);
    // Light sensor in % / reverse in order to have 0% for LOW light and 100% for  high light
    luminosity = 100 - map(luminosity,0,1024,0,100);
    Serial.print(luminosity);
    Serial.println(" %");
    ThingSpeak.setField(1, luminosity); // Field  1 , sending the variable luminosity
    ThingSpeak.writeFields(myChannelNumber,  myWriteAPIKey);
    }

Downloadable files

Light Sensor - Fritzing

Documentation

Pi_C3_A8ce1+2.5mm+epaisseur.STL

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