09 May 2024


Are you looking to build a weight sensor with Arduino that can handle up to 200kg? Look no further, as we have put together a step-by-step guide to help you create your very own weight sensor with Arduino.

For this project, you will need the following materials:

– Arduino Uno
– HX711 load cell amplifier
– Load cell sensor capable of handling up to 200kg
– 10kg calibration weight
– Jumper wires
– Breadboard
– Resistor (between 1k to 10k ohms)
– Soldering iron and solder
– Screwdriver

Step 1: Connect the HX711 Load Cell Amplifier to the Arduino
Start by connecting the HX711 load cell amplifier to the Arduino. Connect VCC to 5V, GND to GND, DT to pin 2 on the Arduino, and SCK to pin 3 on the Arduino.

Step 2: Connect the Load Cell Sensor to the HX711 Load Cell Amplifier
Next, connect the load cell sensor to the HX711 load cell amplifier. The load cell sensor should have four wires – red, black, white, and green. Connect red to E+, black to E-, white to A+, and green to A- on the HX711 board.

Step 3: Connect the Resistor
Connect the resistor between E+ and A+ on the HX711 board. This will help stabilize the reading.

Step 4: Connect the Calibration Weight
Place the 10kg calibration weight on the load cell sensor. This will help calibrate the weight sensor.

Step 5: Upload the Code
Upload the following code to the Arduino:

#include “HX711.h”
#define DOUT 2
#define CLK 3

HX711 scale(DOUT, CLK);

void setup() {
Serial.begin(9600);
scale.set_scale();
scale.tare();
}

void loop() {
Serial.println(scale.get_units(10));
delay(500);
}

Step 6: Calibrate the Weight Sensor
Open the serial monitor on the Arduino IDE and observe the readings. Adjust the calibration factor in the code until the readings are accurate.

And there you have it, a 200kg weight sensor built with Arduino. You can now use this sensor for various applications such as monitoring the weight of objects, creating a smart scale, or even building a DIY weightlifting set. Have fun experimenting with your new weight sensor!

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