Install & Setup for RaspPi GPIO Pendant: cncjs-pendant-raspi-gpio

Gracefully shutdown the Raspberry Pi using a hardware button.

• http://www.banggood.com/Power-Symbol-Latching-Switch-LED-Light-Push-Button-SPST-p-1064278.html
• https://cad.onshape.com/documents/94796d1c35c5a20444b82aa2/w/23a4445409a14a7f19bbd918/e/306a16744c5d0f265eb26f3c

NOTE: Jumping pins 5 & 6 (grounding GPIO3) will power on the RPi. So I altered the script to use GPIO3, rather than pin 40. Now I can use the same button to turn on and off the Pi!

See RaspPi GPIO Pendant: cncjs-pendant-raspi-gpio