The SparkFun OpenScale is an open-source weight measurement board designed for load cells. Simply connect a four-wire or five-wire load cell of any capacity, plug into USB, open a serial terminal at 9,600 bps, and you'll immediately see mass readings. A built-in serial menu lets you configure calibration values, sample rate, timestamps, and units of precision.

Designed for static and continuous weighing applications — such as monitoring systems, conveyor belts, and long-term data logging — the OpenScale can operate unattended for months. An on-board TMP102 temperature sensor records ambient temperature alongside weight data.

Key Features

• HX711 24-Bit ADC – High-resolution load cell amplifier for accurate weight measurement
• ATmega328P Microcontroller – Handles serial communication and configuration
• TMP102 Temperature Sensor – Records ambient temperature alongside weight data
• FT231 USB-to-Serial – Mini-USB connection for data output
• Configurable Baud Rate – 1,200 to 1,000,000 bps (default 9,600 bps 8-N-1)
• Serial Configuration Menu – Set calibration, sample rate, timestamps, and precision via terminal
• Multi-Cell Support – Works with single load cells or four sensors in Wheatstone bridge configuration

Ideal For

• DIY weigh scales and measurement systems
• Long-term unattended weight monitoring
• Industrial and conveyor belt weighing
• Data logging with OpenLog or similar serial loggers

Package Contents

• 1× SparkFun OpenScale Board

Resources

• OpenScale Applications & Hookup Guide