Arduino Raspberry Pi Interface with LCD Display

by Lewis Loflin

For an explanation on the operation of the LCD part of this page see Connect a Serial LCD Display to Raspberry Pi

For an explanation of how to read 16-bit code from Arduino without the use of I2C see Serial Read from Arduino to Raspberry Pi

The Arduino sketch is arduino_ds18b20X2.ino.

This program is a combination of the above two programs. Arduino operates any number of sensors while Raspberry Pi reads the integer results, does any conversions, and displays the result on a serial LCD display.

The program will reset Arduino and the sensor routines/calls are in the Arduino setup section. The return value is stored in a variable and read back by Raspberry Pi.

Arduino is programmed to operate as a 16-bit TLC548 ADC.

The Python code is rpi_arduino3.txt.

The GPIO connections are as follows:

GPIO.setmode(GPIO.BCM)

CS = 18
CLK =23
dataBit = 24
Reset = 25

This is a collection of programs and hardware hacks related to mainly Raspberry Pi and Debian Linux.