The Sparkfun load cell amplifier is a small breakout board for the IC HX711, with which you can easily read load cells for weight measurement. If you connect the amplifier to your microcontroller, you can read the changes in the resistance of the load cell and with some calibration you can get very precise weight measurements. This can be useful for creating your own industrial scale, process control or simple presence detection.
The HX711 uses a two-wire interface (Clock and Data) for communication. The GPIO pins of each microcontroller should work, and numerous libraries have been written that make it easy to read data from the HX711. See the connection instructions below for more information.
Load cells use a four-wire Wheatstone bridge configuration to connect to the HX711. These are usually available in RED, BLK, WHT, GRN and YLW. Each color corresponds to the conventional color coding of load cells:
The YLW pin acts as an optional input, which is not connected to the DMS, but is used for grounding and shielding against external EMI (electromagnetic interference). Please note that some load cells may have slight deviations in the color coding.
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