Hi, I am having problems in communication between Wemos D1 mini and Wemos XI via I2C.
Whenever I send I2C packet from D1 to XI, the program on XI gets stucked.
I'm using this example to test it:
// Wire Slave Receiver
// by Nicholas Zambetti <http://www.zambetti.com>
// Demonstrates use of the Wire library
// Receives data as an I2C/TWI slave device
// Refer to the "Wire Master Writer" example for use with this
// Created 29 March 2006
// This example code is in the public domain.
Wire.begin(0x7F); // join i2c bus with address #8
Wire.onReceive(receiveEvent); // register event
Serial.begin(9600); // start serial for output
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
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
And get this output:
I'm having D1, D2 and A4, A5 (+GNDs), connected with pullups 4k7 to 3V3.
The documentation for XI is shit as it doesn't exists No schematics, no API