HX711 uses 24 high-precision A / D converter. This chip is designed for high-precision electronic scale and design, has two analog input channels, programmable gain of 128 integrated amplifier. The input circuit can be configured to provide a bridge voltage electrical bridge (such as pressure, load) sensor model is an ideal high-precision, low-cost sampling front-end module.
Specification of HX711
- Two selectable differential input channels
- On-chip power supply regulator for load-cell and ADC analog power supply
- On-chip oscillator requiring no external component with optional external crystal
- On-chip power-on-reset
- Data Accuracy: 24 bit (24 bit analog-to-digital converter chip)
- Refresh Frequency: 10/80 Hz
- Operation supply voltage range: 4.8 ~ 5.5V
- Operation supply Current: 1.6mA
- Operation temperature range: -20 ~ +85℃
- Demension: Approx. 36mm x 21mm x 4mm / 1.42″ x 0.83″ x 0.16″
The four wires coming out from the wheatstone bridge on the load cell are usually :
- Excitation+ (E+) or VCC is red
- Excitation- (E-) or ground is black
- Output+ (O+), Signal+ (S+)+ or Amplifier+ (A+) is white
- Output- (O-), Signal- (S-)+ or Amplifier- (A-) is green
HX711 to Arduino Uno :
- VCC to 5V
- GND TO GND
- SCK to D5
- DT TO D6
Load Cell to HX711
- E+ : RED
- E- : BLACK
- A- : WHITE
- A+ : GREEN
