GPIO Control

This Uses https://www.npmjs.com/package/onoff npm module to read input from GPIO

Hardware Connections on breadboard

Connect Pin1(3.3v) (or pin17) of raspberry pi to a 1k resistor.
From the 1k resistor take three wires and connect to three different switches
Connect from switches to pin 11(GPIO 17), pin 12(GPIO 18) and pin 13(GPIO 27).
Now the switch connected to
- pin11(gpio 17) acts as forward button if evince pdf reader is not running. If evince pdf reader is running then this switch acts as show next slide .
- pin12(gpio 18) acts as backward button if the evince pdf reader is not running. show previuos slide otherwise.
- pin13(gpio 27) acts as pause/play playlist button.