If you are feeling the stress and strain of modern life 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 an HX711 ADC chip, plus some support circuitry, and a 6 port terminal block that can be used to connect one or two 4-wire sensors. The E-pad connects to the ground (often a black wire), and 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, when 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.
Specifications
HX711 Specifications
Two selectable differential input channels
On-chip active low noise PGA with gains of 32 (B), and 64 or 128 (A)
On-chip power supply regulator for load-cell and ADC analogue power supply
On-chip oscillator requiring no external component with optional external crystal
On-chip power-on-reset
Simple digital control and serial interface
Selectable 10SPS or 80SPS output data rate
Simultaneous 50 and 60Hz supply rejection
Current consumption including on-chip analogue power supply regulator: normal operation < 1.5mA, power down < 1uA
Operation supply voltage range: 2.6 ~ 5.5V
Dimensions: 25.5mm x 23.0mm x 12.1mm
Weight: 3.9g
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