Quantity   Component name
1 × Step Up Voltage Regulator https://www.pololu.com/product/2561
1 × AA battery Any brand, rechargble or not is fine
1 × AA battery holder
1 × Arduino Pro Micro / Seeeduino V4.2 Any Arduino that runs on 3.3V
1 × JDY-08 Breakout https://www.aliexpress.com/item/32908901875.html?
2 × MAX9938FEUK Amplifier and Linear ICs / Operational Amplifiers
2 × SOT23 Adaptor https://www.sparkfun.com/products/717
2 × 5 ohm resistors Precision Current Sense Resistors, 0805 package
4 × 1uF capacitors
2 × (Alternative) Current Sense Module https://www.adafruit.com/product/1164
1 × 0.1" male connectors 20 pins