LOAD CELL SENSOR AMPLIFIER

DESCRIPTION

The Load Cell Amplifier HX711 modules allows you to easily read load cells to measure weight. By connecting the amplifier to your micro-controller such as an Arduino 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.

The HX711 uses a two-wire interface (Clock and Data) for communication. Any microcontroller’s GPIO pins should work, and numerous libraries have been written, making it easy to read data from the HX711. Check the hookup guide below for more information.

SPECIFICATION

• 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)
• Output Data Rate: 10/80 Hz
• Operation supply voltage range: 4.8 ~ 5.5V
• Operation supply Current: 1.6mA
• Operation temperature range: -20 ~ +85℃
• Dimension: Approx. 36mm x 21mm x 4mm

CONNECTION

Load Cell to HX711:

• E+ : RED
• E- : BLACK
• A- : WHITE
• A+ : GREEN

REFERENCE CODING

#include "HX711.h"

HX711 scale(A1, A0); // DOUT, SCK

void setup()
{
  Serial.begin(9600);
  scale.set_scale(2280.f); // this value is obtained by calibrating the scale with known weights
  scale.tare();
}

void loop()
{
  Serial.print("one reading:\t");
  Serial.print(scale.get_units(), 1);
  scale.power_down(); // put the ADC in sleep mode
  delay(5000);
  scale.power_up();
}