This example shows the usage of an srf04 module. The application uses a timer and two gpio pins. The module is an ultrasonic range finder with a small protocol [1]:
- trigger pin is raised high for 10 us by calling trigger function
- after a sample period of 50 ms the value can be read out
[1] www.robot-electronics.co.uk/htm/srf04tech.htm
Build, flash and start the application:
export BOARD=your_board
make flash term