# SparkFun Load Cell Amplifier - HX711 ## Description 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 can be handy for creating your own industrial scale, process control or simple presence detection. ## Project Details - **Owner:** adrian95 - **Created:** 6/23/2022 - **Last Updated:** 2/8/2023 - **Visibility:** Public - **Stars:** 2 - **Forks:** 77 - **Copies:** 1 ## Key Components ### J1 — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical~cas.md) - Part Type: Connector **Pins:** - 1 - 2 - 3 - 4 - 5 ### J2 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/pin-header-01x02-254mm-vertical~4uy.md) - Part Type: Connector **Pins:** - P1 - P2 ### J4 — [Pin Header 01x05 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x05-254mm-vertical~cas.md) - Part Type: Connector **Pins:** - 1 - 2 - 3 - 4 - 5 ### JP1 — [Solder Jumper 2 Open](https://www.flux.ai/adrian95/solder-jumper-2-open~zgc.md) - Manufacturer Part Number: Jumper_2_Open **Pins:** - A - B ### Q1 — [MMBT4403](https://www.flux.ai/adrian95/mmbt4403~nvf.md) - Manufacturer Part Number: MMBT4403 - Part Type: Transistor - Manufacturer Name: onsemi - Datasheet URL: https://www.snapeda.com/parts/MMBT4403/ON%20Semiconductor/datasheet/ **Pins:** - B [pin B] - C [pin C] - E [pin E] ### U1 — [HX711](https://www.flux.ai/adrian95/hx711~8y6.md) - Datasheet URL: https://www.snapeda.com/parts/HX711/AVIA%20SEMICONDUCTOR/datasheet/ - Manufacturer Part Number: HX711 - Part Type: Integrated Circuit - Manufacturer Name: Avia Semiconductor **Pins:** - AGND - AVDD - BASE - DOUT - DVDD - INA- - INA+ - INB- - INB+ - PD_SCK - RATE - VBG - VFB - VSUP - XI - XO *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/adrian95/sparkfun-load-cell-amplifier-hx711~5rm](https://www.flux.ai/adrian95/sparkfun-load-cell-amplifier-hx711~5rm).* --- *Generated from [https://www.flux.ai/adrian95/sparkfun-load-cell-amplifier-hx711~5rm](https://www.flux.ai/adrian95/sparkfun-load-cell-amplifier-hx711~5rm)*