SparkFun Load Cell Amplifier - HX711

The SparkFun Load Cell Amplifier - HX711 is a small breakout board that lets your microcontroller read a load cell, so you can build accurate digital scales and measure force or weight in your projects.

Load cells change their resistance by tiny amounts when weight is applied. The HX711's 24-bit analog-to-digital converter amplifies and measures these small changes from any standard four-wire Wheatstone bridge load cell, then passes the result to your microcontroller over a simple two-wire clock and data connection using ordinary GPIO pins. Arduino libraries make it quick to get readings.

The board keeps its analog and digital supplies separate and adds extra filtering on the digital side for cleaner, lower-noise readings. An optional YLW pin is provided for connecting a load cell's shield wire to help reduce electromagnetic interference.

Features

• HX711 24-bit ADC designed for weigh scales and load cells
• Works with standard four-wire Wheatstone bridge load cells
• Operating voltage: 2.7V to 5V
• Operating current: under 1.5mA
• Selectable 10SPS or 80SPS output data rate
• Simultaneous 50Hz and 60Hz supply rejection
• Simple two-wire clock/data interface on any GPIO pins
• Separate analog and digital supplies with extra digital filtering
• Optional YLW pin for shield grounding against EMI

Dimensions

Not specified by the manufacturer.

What's in the box?

1 x SparkFun Load Cell Amplifier - HX711

Resources

• Hookup Guide
• Schematic
• Get Started with Load Cells
• Datasheet (HX711)