Adding LEDs To The SO2R Mini – WORK IN PROGRESS
Several users have enquired about adding indicator LEDs to the SO2R Mini. The good news is that the SO2R Mini was designed with LEDs in mind. On the circuit board, you’ll find a header labeled H4, which is designed for adding four LEDs external to the SO2R Mini, two for TX status, and two for RX status.
A schematic for wiring the LEDs can be found here.
The needed Arduino sketch to enable the functionality can be found here.