Weight_Sensor_Module_SKU

Introduction

Digital Weight Sensor Module is based on HX711 module, which is a precision 24-bit analog-to-digital convertor designed for a weight scale. It also designed for industrial control applications to interface directly with a bridge sensor. Compared with other chips, HX711 not only has a few basic function, but also contains high integration, fast response, immunity, and other features. The chip is also a lower cost compared to other electrionic scales, and still improves on performance and reliability.

The input interface of this weight sensor module is compatible with Arduino I/O port. The output adopts a compact terminal that makes weight sensor module easier to connect the weight sensor. It's the best choice for electronic enthusiast for a tiny home scale.

The weight sensor module can be combined with weight sensor on the market. We can also help you to pick a small range weight sensor.

Specification

24-Bit Analog-to-Digital Converter for Weight Scales (HX711)

Two selectable differential input channels
On-chip active low noise PGA with selectable gain of 32, 64 and 128
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-rest
Simple digital control and serial interface: pin-driven controls, no programming needed
Selectable 10SPS or 80SPS output data rate
Simultaneous 50 and 60Hz supply rejection
Supply Voltage: 2.6V~5.5V
Current: <1.6mA
Working temperature: -40~85°C
16 pin SOP-16 package

Weight Sensor Module

Range:1kg
Excitation voltage: 5-15 V
Output sensitivity: 1.0±0.15mV/V
Synthetical error: 1 per thousand cent of full scale
Zero shift: 0.05/0.03 （30min）%F.S
Zero temperature shift: 0.05/0.03 %F.S/10°C
Zero output: ±0.1mV/V
Input impedance: 1055±15 Ω
Output impedance: 1000±5 Ω
Overload capability: 200 %F.S
Output: Analog output
Size: 33mm*38mm

Tutorial

The range of the weight scale is only 1kg. So, it's very appropriate for you to make a kitchen scale. we will bring you a step by step tutorial to make one and print the data by Arduino Serial Monitor.

Hardware Requirement

Note: The weighing platform will be made by yourself according to the weight sensor machine drawing. The following figure show the weight sensor machine drawing.

Connection Diagram

Software Requirement

Detail Steps

1. Install the Arduino library to your Arduino IDE. Upload the following codes.

#include <DFRobot_HX711.h>

DFRobot_HX711 MyScale(A2, A3);

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print(MyScale.readWeight(), 1);
  Serial.println(" g");
  delay(200);
}

2. Upload the sample code to UNO. When finished, you put the weight sensor horizontally, one end with four wires is fixed on the table, the other one suspended.

3. Open the Serial montior，and press the sensor according to the label direction.

Check the Serial monitor, when you press the sensor

Left image: Normal data. The date will have a growth process with different intensity of hand.

Right image:Abnormal data.

Possible Reasons: a. Forced direction is wrong. b. Maybe the connection isn't firm.

4. Install the weighing platform

5. The weight scale will be finished within one more step-- zero adjustment.

Open the DFRobot_HX711 library folder, and find the file DFRobot_HX711.h, open it. Locate the statement

void setCalibration(float base = 1992.f)

You only need to adjust the number 1992 to find the appropriate value for weight scale. Save the h file, and upload the above code again.

The structure of the weight sensor

Documents

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

Weight_Sensor_Module_SKU_SEN0160-DFRobot