This page outlines a simple way to add indicator lights to the front panel of a CM108 based Allstar node.
The blue LED is the PTT indicator and the green one is the blinking ” keep alive ” LED.
The black wire goes to ground on the body of the Rpi.
This setup is particularly suited to my Classic CM108 based Allstar Node Design. : LINK
Be aware that it is also possible to connect Tx and Rx indicator lights on the Raspberry Pi itself via the GPOI pins. This, however, does demand quite a high degree of coding ability and so is outwith the scope of this Allstar for beginners website.