I am trying to get my ESP8266's connect and send messages over an i2c bus. I am using a NodeMcu Development Board. Pins D1,D2 and GND are connected to each other.
The code on my master is :
#include <Wire.h>
void setup() {
Wire.begin(D1,D2); // join i2c bus (address optional for master)
Serial.begin(115200);
}
byte x = 0;
void loop() {
Wire.beginTransmission(8);
Wire.write(x); // sends one byte
Wire.endTransmission(); // stop transmitting
Serial.println("Transmitted");
x++;
delay(500);
}
And the code on my slave ESP is:
#include <Wire.h>
void setup() {
Wire.begin(8); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(115200); // start serial for output
}
void loop() {
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
Serial.println("Received..");
/*
while (1 < Wire.available()) { // loop through all but the last
char c = Wire.read(); // receive byte as a character
Serial.print(c); // print the character
}
*/
int x = Wire.read(); // receive byte as an integer
Serial.println(x); // print the integer
}
Running this gives no output on the receiver chip.
