If you are feeling the stress and strain of a Wheatstone bridge and you want to quantify it, this handy breakout will do the job, no sweat! The Adafruit HX711 Breakout contains a super-high-resolution 24-Bit differential ADC with extra gain circuitry that makes it perfect for measuring strain gauges / load cells or other sensors that have four wires that are connected in a Wheatstone bridge arrangement.

Each breakout comes with a HX711 ADC chip, plus some support circuitry, and 6 port terminal block that can be used to connect one or two 4-wire sensors. The E- pad connects to ground (often a black wire), the E+ pad connects to the power voltage supplied to the HX711 (often a red wire).

Then A- and A+ pads connect to the differential outputs from the bridge. For example, connecting to a strain gauge these tend to be the white and green wires. If you have a second gauge or voltage you want to measure, you can use the B- and B+ pads. On the A channel, you can select 64x or 128x gain. On the B channel, you have a fixed 32x gain.

This sensor uses a two-wire protocol, similar to SPI. If you want a similar sensor but I2C, check out the NAU7802 breakout we make. We based this design on the excellent Sparkfun HX711 breakout: incorporating their split analog/digital supply and digital supply filtering. We then made a few tweaks: pre-soldered terminal blocks, the second bridge exposed, and a slide switch to change between 10 SPS and 80 SPS rates.

This guide was first published on Jun 25, 2024. It was last updated on Jul 22, 2024.

This page (Overview) was last updated on Jun 25, 2024.

Text editor powered by tinymce.