Reference circuit diagram of an Arduino-compatible LCD backpack is shown below. What follows next is information on how to use one of these inexpensive backpacks to interface with a microcontroller in ...

I2C is actually the most limited of the serial peripheral modes due to the requirement for the I2C ... The arduino R3 pinout includes an IORef pin which will be 5v on a 5v arduino but 3.3v on a 3 ...

To communicate with each LCD via I2C, two TCA9548A I2C multiplexers are connected to an Arduino, along with an RTC to keep track of the time and date itself.