PCB will take 3.3V pro mini or 5V pro mini and connects to NRF24L01+ radio.

Version 2 Fixes

• fixes some orphaned Ground Planes
• Replaces the thru-hole resistors with SMD
• adds power “ports” for various things like relay, PIR, and Temp sensors

For 3.3V Battery powered Sensor:

• No place the AMS1117 regulator
• Tie 3v3,IN,and VCC together.
• Can also place Resistors R1 (1M) and R2 (470k), and C3 (0.01uF) to measure battery voltage on A0
• Should also place C2 (10uF to 47uF or whatever works best in your environment) for more stability on Radio.

For 5V powered sensor (like from USB charger):

• Place AMS1117 3.3V regulator.
• Place C1 and C2
• Tie VCC to VIN option.
• Do NOT place R1, R2, or C3 (no battery sensor).

Other Notes

• D8 – D3 have extra headers
• A3 – A1 have extra headers
• A7 – A4 have headers on pro mini itself.
• See mySensors.org for more information. This PCB is not officially affiliated with MySensors.