HC_SR04_For_RPi

A C Macro for easy use and interfacing of the HC_SR04 Ultrasonic Distance sensor on the Raspberry Pi. This was built on the bcm2835 C library that allows access the Raspberry Pi's GPIO pins, internal clock, etc.

How to use Macro

1. Either turn on and open the terminal on your Pi or ssh into your Pi. Watch the video found here from time 1:30 to 5:00 for instructions on how to install the bcm2835 library.

2. Next download or copy the HC_SR04.c, HC_SR04.h, and the main.c files above into what ever directory you want to use on your raspberry pi.

3. Next compile them by running the command below:

   gcc -o example main.c HC_SR04.c -l bcm2835
   

4. Connect the trigger pin of the HC-SR04 sensor to Pin 11 (GPIO 17) on the raspberry pi and connect the echo pin on the sensor to Pin 15 (GPIO 22) on the pi. Also connect +5V and GND either from the pi or an external power supply.

5. To test this, just type:

   sudo ./example