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Description
- The Weight Sensor Kit 10KG - Load Cell Amplifier HX711 is a kit that allows you to measure weight with high precision. It consists of a 10kg load cell, which converts force into an electrical signal that can be measured. This electrical signal varies depending on the applied force.
- The kit also includes an ADC amp module that uses a 24 high-precision A/D converter chip HX711. The module is designed for high-precision electrical scale applications and has two analog channel inputs, as well as an internal programmable amplifier with a gain of 128. The input circuit can be configured to provide an electrical bridge voltage, such as for pressure and weight sensors.
Features:
- Internal 24bit ADC amplifier
- 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
- Output sensing range depends on the input voltage
- The higher the pressure force, the higher the output analog voltage.
Specification:
- Load Cell
- Material: Aluminium Alloy
- Capacity: 10kg
- To measure the weight of the item
- Operating Voltage: 2.6 to 5.5V
- Operation Temperature: -20 to 85 Deg C
- Thread Hole: M4 Screw
- Dimension: 13 x 13 x 80 Mm (L x W x H)
- HX711 Amplifier
- Converter chip: 24-bit A/D
- Measurement Resolution: 24 bit
- Selectable differential input channels: 2
- Output data rate: Selectable 10Hz / 80Hz
- 2 wire communication: Clock and Data
- Dimension: 24 x 15 x 1 Mm (L x W x H)
- Weight: 33g
Applications:
- Industrial weight measurement systems: The high precision and low-cost nature of the kit make it ideal for use in various industrial weight measurement systems. For example, it can be used to measure the weight of raw materials in a production process or to monitor the weight of finished products.
- Home automation: The kit can be used in home automation projects to monitor the weight of various household items. For example, it can be used to monitor the weight of a pet's food bowl to ensure that the pet is getting the right amount of food.
- Health and fitness: The kit can be used in health and fitness applications to monitor weight, such as in smart bathroom scales or fitness tracking devices.
- Agricultural applications: The kit can be used in various agricultural applications, such as in livestock feeders, to monitor the weight of feed and ensure that the animals are getting the right amount of nutrition.
Pin Connections:
- Weight Sensor:
| Wire Color | Connection |
|---|---|
| Red | E+ |
| Black | E- |
| Green | A+ |
| White | A- |
- HX711 Module:
Package Includes:
- 1 x HX711 Module
- 1 x Load Cell 10Kg
Sample Project:
Circuit:
Library:
- The HX711 library is available here: https://github.com/bogde/HX711
- See this link on the Arduino website for instructions on how to add the library to your Arduino IDE: https://www.arduino.cc/en/Guide/Libraries
- Sparkfun has great Arduino programs to run the scale. The most up to date versions are available on GitHub and reprinted below: https://github.com/sparkfun/HX711-Load-Cell-Amplifier
Code:
- The first software step is to determine calibration factors for the scale. To do this, run this code:
/*
Example using the SparkFun HX711 breakout board with a scale
This is the calibration sketch. Use it to determine the calibration_factor that the main example uses. It also
outputs the zero_factor useful for projects that have a permanent mass on the scale in between power cycles.
Setup your scale and start the sketch WITHOUT a weight on the scale
Once readings are displayed place the weight on the scale
Press +/- or a/z to adjust the calibration_factor until the output readings match the known weight
Use this calibration_factor on the example sketch
This example assumes pounds (lbs). If you prefer kilograms, change the Serial.print(" lbs"); line to kg. The
calibration factor will be significantly different but it will be linearly related to lbs (1 lbs = 0.453592 kg).
Your calibration factor may be very positive or very negative. It all depends on the setup of your scale system
and the direction the sensors deflect from zero state
This example code uses bogde's excellent library:"https://github.com/bogde/HX711"
bogde's library is released under a GNU GENERAL PUBLIC LICENSE
Arduino pin 2 -> HX711 CLK
3 -> DOUT
5V -> VCC
GND -> GND
Most any pin on the Arduino Uno will be compatible with DOUT/CLK.
The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.
*/
#include "HX711.h"
#define LOADCELL_DOUT_PIN 3
#define LOADCELL_SCK_PIN 2
HX711 scale;
float calibration_factor = -7050; //-7050 worked for my 440lb max scale setup
void setup()
{
Serial.begin(9600);
Serial.println("HX711 calibration sketch");
Serial.println("Remove all weight from scale");
Serial.println("After readings begin, place known weight on scale");
Serial.println("Press + or a to increase calibration factor");
Serial.println("Press - or z to decrease calibration factor");
scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
scale.set_scale();
scale.tare(); //Reset the scale to 0
long zero_factor = scale.read_average(); //Get a baseline reading
Serial.print("Zero factor: "); //This can be used to remove the need to tare the scale. Useful in permanent scale projects.
Serial.println(zero_factor);
}
void loop()
{
scale.set_scale(calibration_factor); //Adjust to this calibration factor
Serial.print("Reading: ");
Serial.print(scale.get_units(), 1);
Serial.print(" lbs"); //Change this to kg and re-adjust the calibration factor if you follow SI units like a sane person
Serial.print(" calibration_factor: ");
Serial.print(calibration_factor);
Serial.println();
if(Serial.available())
{
char temp = Serial.read();
if(temp == '+' || temp == 'a')
calibration_factor += 10;
else if(temp == '-' || temp == 'z')
calibration_factor -= 10;
}
}
- After calibrating the scale, you can run this sample program, then hack it up for your own purposes:
/*
Example using the SparkFun HX711 breakout board with a scale
This example demonstrates basic scale output. See the calibration sketch to get the calibration_factor for your
specific load cell setup.
This example code uses bogde's excellent library:"https://github.com/bogde/HX711"
bogde's library is released under a GNU GENERAL PUBLIC LICENSE
The HX711 does one thing well: read load cells. The breakout board is compatible with any wheat-stone bridge
based load cell which should allow a user to measure everything from a few grams to tens of tons.
Arduino pin 2 -> HX711 CLK
3 -> DAT
5V -> VCC
GND -> GND
The HX711 board can be powered from 2.7V to 5V so the Arduino 5V power should be fine.
*/
#include "HX711.h"
#define calibration_factor -7050.0 //This value is obtained using the SparkFun_HX711_Calibration sketch
#define LOADCELL_DOUT_PIN 3
#define LOADCELL_SCK_PIN 2
HX711 scale;
void setup()
{
Serial.begin(9600);
Serial.println("HX711 scale demo");
scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
scale.set_scale(calibration_factor); //This value is obtained by using the SparkFun_HX711_Calibration sketch
scale.tare(); //Assuming there is no weight on the scale at start up, reset the scale to 0
Serial.println("Readings:");
}
void loop()
{
Serial.print("Reading: ");
Serial.print(scale.get_units(), 1); //scale.get_units() returns a float
Serial.print(" lbs"); //You can change this to kg but you'll need to refactor the calibration_factor
Serial.println();
}