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When it comes to precision weighing, load cells are an essential component in any weighing system. Load cells are transducers that convert force into an electrical signal, making them ideal for measuring weight accurately. In this article, we will discuss how to interface a 100kg load cell with an Arduino for precision weighing.
Before we delve into the technical details, it is important to understand the basics of a load cell. Load cells come in various shapes and sizes, depending on the application. In this case, we will be using a 100kg load cell, which is suitable for medium to heavy-duty weighing tasks. The load cell consists of a strain gauge bonded to a metal structure, which deforms under force. This deformation causes a change in resistance in the strain gauge, which is then measured as an electrical signal.
To interface a 100kg load cell with an Arduino, you will need the following components:
1. 100kg load cell
2. HX711 amplifier module
3. Arduino Uno
4. Breadboard and jumper wires
The HX711 amplifier module is a crucial component in this setup, as it amplifies the small signal from the load cell to a measurable level for the Arduino. The HX711 module also has built-in ADC (Analog-to-Digital Converter) to convert the analog signal from the load cell into a digital signal that the Arduino can process.
To begin, connect the load cell to the HX711 amplifier module as follows:
– Connect the black wire of the load cell to the E- terminal on the HX711 module.
– Connect the red wire of the load cell to the E+ terminal on the HX711 module.
– Connect the white wire of the load cell to the A- terminal on the HX711 module.
– Connect the green wire of the load cell to the A+ terminal on the HX711 module.
Next, connect the HX711 module to the Arduino Uno:
– Connect the DT pin on the HX711 module to digital pin 3 on the Arduino.
– Connect the SCK pin on the HX711 module to digital pin 2 on the Arduino.
– Connect the Vcc pin on the HX711 module to the 5V pin on the Arduino.
– Connect the GND pin on the HX711 module to the GND pin on the Arduino.
Now that the hardware is set up, you can start coding the Arduino. You will need to install the HX711 library for Arduino, which can be found online. Once the library is installed, you can upload the following code to the Arduino:
#include
const int DT_pin = 3;
const int SCK_pin = 2;
HX711 scale;
void setup() {
Serial.begin(9600);
scale.begin(DT_pin, SCK_pin);
}
void loop() {
Serial.println(scale.read());
delay(1000);
}
This code will continuously read the weight from the load cell and print it to the serial monitor. You can now place an object on the load cell and see the weight being displayed in real-time.
In conclusion, interfacing a 100kg load cell with an Arduino for precision weighing is a relatively simple process that can be achieved with the right components and basic coding knowledge. By following the steps outlined in this article, you can create your own accurate weighing system for a variety of applications.
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