As of Arduino 1.0, the library inherits from the Stream functions, making it consistent with other. On the Arduino Mega, SDA is digital pin 20 and SCL is 21. On most Arduino boards, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5. The address is the I2C address of the slave device we need to. I have read registers from 0-20 and several write registers however I'm only interested in the read registers.Īny help would be much appreciated and please ask any questions you might have. This library allows you to communicate with I2C / TWI devices. The complete syntax to request data from a slave device is Wire.requestFrom(address, quantity). uint16t buf Wire.readBytes( (uint8t)&buf, 2) // Print register value. delay(5) // Wait for data to be available. I just don't know if I am supposed to write to a read register and the two bytes are 0x00 and 0x01, or use Wire.request to request two bytes. Wire.endTransmission() Wire.requestFrom(SLAVEI2CADDRESS, 2) // This register is 16 bits 2 bytes long. This is my first time using the protocol. I'm having some trouble understanding I2C.

Wire library read from