AttoPilot Voltage and Current Sense Breakout - 90A

A compact voltage and current sense breakout board capable of measuring up to 51.8V and 89.4A. DC current is measured via a voltage drop across a pair of parallel 1 mΩ shunt resistors, converted to an analog output by the TI INA-169. Voltage sensing uses a precision resistor divider scaled to a 3.3V ADC range — ready to read directly with most microcontrollers.

The board is self-powered (no separate supply needed) and has very low zero-current offset for accurate readings. Supplied without leads or connectors — pad sizes accommodate up to 12-gauge wire, though smaller gauge wire is easier to solder without creating shorts.

Key Features

• High Current Capacity – Measures up to 89.4A DC
• High Voltage Range – Measures up to 51.8V DC
• 3.3V ADC Output – Analog output scaled for direct connection to 3.3V microcontrollers
• Self-Powered – No separate power supply required
• Low Zero Offset – Accurate readings at low current levels
• Compact Design – Just 4 × 15 × 19 mm

Specifications

• Max Voltage – 51.8V
• Max Current – 89.4A
• Current Sense IC – TI INA-169
• Shunt Resistors – 2× 1 mΩ in parallel
• Output – Analog, scaled for 3.3V ADC
• Dimensions – 4 × 15 × 19 mm

Ideal For

• Battery monitoring for drones and RC vehicles
• Power supply current and voltage logging
• Solar panel monitoring
• High-current motor load measurement

Package Contents

• 1× AttoPilot Voltage and Current Sense Breakout (90A)

Resources

• Datasheet (PDF)
• Example Arduino Sketch