Power Module 4

Back side:

An "Arduino Nano 33 BLE Sense" shield that...

Supplies 5V (V+ pins) from a TSP61220 step-up converter,
- This voltage also powers the Arduino
Supplies 2.5V (Vref pins) from a voltage divider + LM321 opamp,
Is powered by a 1.2V AAA battery on "Keystone 82" battery clips,
Exposes 3 digital and 8 analog pass-through pins for the Arduino
Provides jumpers for
- Enabling the reference voltage circuit
- Connecting Arduino's A7 to the + terminal of the battery to measure the battery level
- Two software-configurable pins that you can ground with a jumper
- Five jumpers that connect each of the five screw mounting points with Vref, to turn them into ground electrode(s) if desired
Is based on Power Module 3, with the following changes:
- Separated I/O pins from power pins
- Added a third set of power pins
- Added screw mounting places which are optionally connected to Vref
- Added holes for rubber bands for connection to other boards like Electrode Module 3
Dimensions: 89.98mm x 32.58mm