- Easily read load cells to measure weight
- Handy for creating your own industrial scale, process control or simple presence detection
- Separated analog and digital supply
- Added 3.3uH inductor and a 0.1uF filter capacitor for digital supply
The SparkFun Load Cell Amplifier is a small breakout board for the HX711 IC that allows you to easily read load cells to measure weight. By connecting the amplifier to your microcontroller you will be able to read the changes in the resistance of the load cell, and with some calibration you’ll be able to get very accurate weight measurements. This version of the SparkFun Load Cell Amplifier features a separated analog and digital supply, as well as added a 3.3uH inductor and a 0.1uF filter capacitor for digital supply.
The HX711 uses a two-wire interface (Clock and Data) for communication. Any microcontroller’s GPIO pins should work, and numerous libraries have been written, making it easy to read data from the HX711. Check the hookup guide below for more information.Load cells use a four-wire Wheatstone bridge configuration to connect to the HX711. These are commonly colored RED(Excitation+ or VCC), (Excitation- or GND), WHT(Amplifier-, Signal- or Output-), GRN(A+, S+ or O+) and YLW(Shield). The YLW pin acts as an optional input that is not hooked up to the strain gauge but is utilized to ground and shield against outside EMI (electromagnetic interference). Please keep in mind that some load cells might have slight variations in color coding.
Operation Voltage: 2.7V--5V
Operation Current: < 1.5mA
Selectable 10SPS or 80SPS output data rate
Simultaneous 50 and 60Hz supply rejection