After printing a simple text value on the LCD, let's take a look at how to view the ultrasonic distance value on the LCD screen. The wiring connection of the HC-SR04 ultrasonic sensor, the 16x2 LCD, and the RPi are as follows:
The LCD connections to the RPi remain the same. The ultrasonic trigger pin is connected to wiringPi pin number 12 and the echo pin is connected to wiringPi pin number 13. Let's now take a look at the program. This program is called LCDdm.cpp (dm is short for distance measurement) and you can download it from the GitHub repository of Chapter04. The LCDdm.cpp program is a combination ...
