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README.md

tests/drivers/srf04

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

Usage

Build, flash and start the application:

export BOARD=your_board
make flash term