Description
This module uses 24 high-precision A / D converter. This chip is designed for high-precision electronic scale and design, has two analog input channels, programmable gain of 128 integrated amplifier. The input circuit can be configured to provide a bridge voltage electrical bridge (such as pressure, load) sensor model is an ideal high-precision, low-cost sampling front-end module.
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)
Refresh Frequency: 10/80 Hz
Operation supply voltage range: 4.8 ~ 5.5V
Operation supply Current: 1.6mA
Operation temperature range: -20 ~ +85℃
Demension: Approx. 36mm x 21mm x 4mm / 1.42" x 0.83" x 0.16"
Communicating with the Balance Module requires a driver for the HX711 sensor. The simplest way to install the driver is to download the HX711 library. Download the ZIP file below > Open Zip File > Extract to your Arduino Uno Library folder. Refer the image above for your references.
Download the sample source code below, open and upload this sample source code into your Arduino IDE.
NOTE : You can change your calibration factor before uploading the code OR you can adjust it later in the serial monitor box since the code allow you to add and substract the value of calibration factor.
when the serial monitor give u a value for reading, it means that u has succesfully interface your load cell. Now, you can set your own calibration factor by adjusting the value using the '+' or 'a' to increase the value OR '-' or 'z' to decrease the value. You have to calibrate only once for each load cell.
NOTE : This tutorial only show you on how to interface HX711 with load cell. We did not use the correct calibration factor. You have to set your own calibration factor for your load cell. Check on this video and tutorial to learn on how to set the calibration factor for load cells. Remember that each load cell with different weight ie. load cell 20KG, 60Kg and 100KG have different value of calibration factor. Thus, you will have to set calibration factor for each load cell with different weight.
This video shows how to interface HX711 Balance Module with Load Cell.