Waterproof 3xAA Battery Holder w/ On/Off Switch soldering flux You may use this with

You may use this with Raspberry Pi

What does the ECG Heart Pulse Sensor Module AD8232 measure

1 × DFRobot Gravity Analog Signal Isolator - 1-Channel Voltage

and machine monitoring

it's convenient for your DIY design

Waterproof 3xAA Battery Holder w/ On/Off Switch soldering flux You may use this withWaterproof 3AA Battery Holder with switch The Waterproof 3AA Battery Holder with switch holds batteries and provides a convenient Wire leads + switch (waterproof) output for connecting to your project. Pair with AA or AAA batteries (rechargeable NiMH recommended for motor projects). Technical specifications Output Voltage 4. 5V (3AA) Cells 3 Output Wire leads + switch (waterproof)