Weight Load Cell Strain Gauge Sensor 50KG

Features:

• Capacity: Measures up to 50 kilograms
• High Accuracy: ±0.1% of rated capacity
• Microcontroller Compatible: Easily integrates with Arduino, Wemos, etc.
• Expandable: Multiple load cells can be combined for larger weight measurements

Specifications:

• Material: Aluminium
• Dimensions: 34 x 34 x 7 mm (L x W x H)
• Weighing Range: 50 Kg
• Rated Output: 1.0 ± 0.1 mV/V
• Non-Linearity: ± 0.03% F.S
• Hysteresis: 0.03% F.S
• Repeatability: 0.05% F.S
• Creep: ±0.15% F.S/3min
• Temp. Effect on Span: ±0.03% F.S/10℃
• Comprehensive Error: ±0.2% F.S
• Cable Length: 18 cm
• Insulation Resistance: 2000 MΩ
• Zero Balance: ± 0.3 mV/V
• Input Impedance: 1115 ± 10% Ω
• Output Impedance: 1000 ± 10% Ω

Applications:

• Weighing scales (home, lab, industrial)
• Industrial automation & quality control
• Force sensors for robotics
• Medical equipment (e.g., hospital beds, lifts)
• Agricultural tools (e.g., grain silos, feeders)

Pinout & Wiring

Sample Project: Digital Weighing Scale Using Arduino

Wiring Steps:

1. Mount 4 load cells to the corners of your platform using epoxy.
2. Wire the cells into a Wheatstone bridge configuration.
3. Connect to the HX711 amplifier board and interface with an Arduino.

Required Library:

• HX711 Arduino Library

Calibration Code:

#include "HX711.h"

#define LOADCELL_DOUT_PIN 3
#define LOADCELL_SCK_PIN 2

HX711 scale;
float calibration_factor = -7050;

void setup() {
  Serial.begin(9600);
  Serial.println("HX711 calibration sketch");
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale();
  scale.tare();
  long zero_factor = scale.read_average();
  Serial.print("Zero factor: ");
  Serial.println(zero_factor);
}

void loop() {
  scale.set_scale(calibration_factor);
  Serial.print("Reading: ");
  Serial.print(scale.get_units(), 1);
  Serial.print(" lbs");
  Serial.print(" calibration_factor: ");
  Serial.println(calibration_factor);

  if (Serial.available()) {
    char temp = Serial.read();
    if (temp == '+' || temp == 'a') calibration_factor += 10;
    else if (temp == '-' || temp == 'z') calibration_factor -= 10;
  }
}

Basic Output Code:

#include "HX711.h"

#define calibration_factor -7050.0
#define LOADCELL_DOUT_PIN 3
#define LOADCELL_SCK_PIN 2

HX711 scale;

void setup() {
  Serial.begin(9600);
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(calibration_factor);
  scale.tare();
  Serial.println("Readings:");
}

void loop() {
  Serial.print("Reading: ");
  Serial.print(scale.get_units(), 1);
  Serial.println(" lbs");
}

Images:

References:

• SparkFun HX711 GitHub
• Arduino Bathroom Scale Instructable
• StackExchange Wiring Guide