HX711 PURPLE
HX711 Load Cell Amplifier
The HX711 load cell amplifier is a small breakout board for the HX711 IC that allows you to 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, & 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 presense detection.
The HX711 uses a two-wire interface (clock & data) for communication.
Any microconotrller’s GPIO pins should work, & numerous libraries have been written, making it easy to read data from the HX711.
Load cells use a four-wire Wheatstone bridge to connect to the HX711.
These are commonly colour RED, BLK, WHT, GRN, and YLW.
Each colour corresponds to the conventional colour coding of load cells
Red (Excitation+ or VCC).
Black (Excitation- or GND).
White (Amplifier+, Signal+, or Output+).
Green (A-, S-, or O-).
Yellow (Shield).
The YLW pin acts as an optional input that not hook 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 variations in colour-coding.
Pinouts
Analog Side
E+: Excitation positive.
E-: Excitation negative.
A-: Channel A Negative Input.
A+: Channel A positive Input.
B-: Channel B Negative Input.
B+: Channel B positive Input.
Digital Side
GND: 0V / Ground Power Connection.
DT: Data IO Connection.
SCK: Serial Clock Input.
VCC: Power Input.
Specification
Two Selectable Differential Input Channels
On-Chip Active Low Noise PGA With Selectable Gain of 32, 64, & 128
On-Chip Power Supply Regulator For Load-Cell & ADC Analog Power Supply
On-Chip Oscillator Requiring No External Component With Optional External Crystal
On-Chip Power-On-Reset
Simple Digital Control & Serial Interface: Pin-Driven Controls, No Programming Needed
Selectable 10SPS Or 80SPS Output Data Rate
Simultaneous 50 & 60Hz Supply Rejection
Current Consumption Including On-Chip Analog Power Supply Regulator: Normal Operation < 1.5mA, Power Down < 1uA
Operation Supply Voltage Range: 2.7 ~ 5V
Operation Temperature Range: -40 ~ +85°C
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