Raspberry Pi + Arduino i2c communication, Wire.wri.display number of bytes and cmd received, as bytes set up the LCD's number of columns and rows: initialize the library with the numbers of the interface pins R = raw_input('Enter something, "q" to quit"') #have to run 'sudo apt-get install python-smbus'īytesToSend = ConvertStringToBytes("Hello Uno")īus.write_i2c_block_data(i2c_address, i2c_cmd_write, bytesToSend) The first byte echo from Arduino is the number of byte to sent, then echo the data in reversed sequency. Then call number of bus.read_byte() to trigger requestEvent in Arduino. In Raspberry Pi, i2c master, it send block of data to Arduino Uno, i2c slave, by calling bus.write_i2c_block_data(), to trigger receiveEvent in Arduino. In this post show how to echo multi-byte from Arduino in requestEvent, by calling Wire.write(). Last exercise show Raspberry Pi master + Arduino slave i2c communication, write block of data from Pi to Arduino Uno, and read a single byte from Arduino Uno.
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