Setting up the software
In this project, the software is really simple, since we just need a procedure that periodically reads the distance and then turn on and off the LEDs accordingly; however, some issues must be pointed out, especially about how to manage the LEDs and the differences between the two setups of the ultrasonic sensor.
Managing the LEDs
Despite of what was presented in the previous chapter about the GPIO's management, it's important to point out that the Linux kernel has several kinds of devices, each one dedicated to a well-defined usage, and one of these special devices are the led devices, which is a particular type of devices that can be used to manage an LED with different triggers. A trigger is a sort of manager of the LED ...
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