30 May 2024

If you’re working on a project that requires interfacing a load cell amplifier with a Raspberry Pi, then you’re in the right place. In this article, we will guide you through the process of interfacing an HX711 load cell amplifier with a Raspberry Pi using Python programming language.

The HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weigh scales and industrial control applications to interface directly with a bridge sensor. It provides extremely accurate and stable measurements and can also be used with various load cells to measure weight.

To interface the HX711 with a Raspberry Pi, you will need the following components:

  1. Raspberry Pi (any model)
  2. HX711 load cell amplifier module
  3. Load cell (such as a strain gauge)
  4. Breadboard and jumper wires
  5. Python IDE (such as Thonny or IDLE)

Once you have all the necessary components, follow these steps to interface the HX711 load cell amplifier with the Raspberry Pi:

Step 1: Connect the HX711 module to the Raspberry Pi

  • Connect VCC pin of the HX711 module to a 3.3V pin on the Raspberry Pi
  • Connect GND pin of the HX711 module to a GND pin on the Raspberry Pi
  • Connect DT pin of the HX711 module to GPIO pin 5 on the Raspberry Pi
  • Connect SCK pin of the HX711 module to GPIO pin 6 on the Raspberry Pi

Step 2: Install the Python library for HX711

  • Open the terminal on the Raspberry Pi
  • Run the following command to install the Python library for HX711:
    pip install hx711

Step 3: Write the Python code to read the load cell values

  • Open your Python IDE and create a new Python script
  • Import the hx711 library and instantiate an HX711 object
  • Set the reference unit and offset values for the load cell
  • Initialize the HX711 module and start reading the load cell values
  • Print the weight values on the console

Here is a sample Python code to read the load cell values using the HX711 module:

from hx711 import HX711

hx = HX711(dout_pin=5, pd_sck_pin=6)
hx.set_reference_unit(92.5)
hx.reset()
hx.tare()
reading = hx.get_weight(5)
print(f"Weight: {reading} grams")

Step 4: Run the Python script

  • Save the Python script and run it on the Raspberry Pi
  • You should see the weight values printed on the console in grams

By following these simple steps, you can easily interface an HX711 load cell amplifier with a Raspberry Pi using Python programming language. This setup can be used in various applications such as weighing scales, industrial control systems, and data logging projects.

If you need further assistance or have any questions, feel free to reach out to Sharp Electronics Pune for expert guidance and support. Happy interfacing!

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