Created
November 13, 2016 11:50
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| // Original: https://oscarliang.com/raspberry-pi-arduino-connected-i2c/ | |
| #include <Wire.h> | |
| #define SLAVE_ADDRESS 0x04 | |
| int number = 0; | |
| int state = 0; | |
| void setup() { | |
| pinMode(13, OUTPUT); | |
| Serial.begin(9600); // start serial for output | |
| // initialize i2c as slave | |
| Wire.begin(SLAVE_ADDRESS); | |
| // define callbacks for i2c communication | |
| Wire.onReceive(receiveData); | |
| Wire.onRequest(sendData); | |
| Serial.println("Ready!"); | |
| } | |
| void loop() { | |
| delay(100); | |
| } | |
| // callback for received data | |
| void receiveData(int byteCount) { | |
| while (Wire.available()) { | |
| number = Wire.read(); | |
| Serial.print("data received: "); | |
| Serial.println(number); | |
| if (number == 1) { | |
| if (state == 0) { | |
| digitalWrite(13, HIGH); // set the LED on | |
| state = 1; | |
| } | |
| else { | |
| digitalWrite(13, LOW); // set the LED off | |
| state = 0; | |
| } | |
| } | |
| } | |
| } | |
| // callback for sending data | |
| void sendData() { | |
| Wire.write(number); | |
| } |
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