Design with SparkFun Load Cell Amplifier - HX711 in Cirkit DesignerThe SparkFun Load Cell Amplifier - HX711 is a small breakout board designed to interface directly with load cells. Load cells are transducers that convert force into an electrical signal, and 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. This module is ideal for applications such as measuring weight, creating scales, and industrial process control where accurate weight measurements are required.
This circuit consists of an Arduino Mega 2560 microcontroller interfaced with a SparkFun Load Cell Amplifier (HX711) and a load cell. The Arduino provides power to the HX711, which amplifies the signal from the load cell and sends the data to the Arduino for processing.
Open Project in Cirkit Designer
This circuit consists of an Arduino UNO connected to a SparkFun Load Cell Amplifier (HX711) and a load cell. The Arduino provides power to the HX711 and reads data from it, which in turn amplifies the signals from the load cell to measure weight or force.
Open Project in Cirkit Designer
This circuit is designed to measure force or weight using a load cell connected to a SparkFun Load Cell Amplifier (HX711), which amplifies and digitizes the signal from the load cell. The amplified signal is then read by an Arduino Mega 2560 microcontroller for processing. Additionally, the circuit includes a 12v power supply with a DC Buck Step-down converter to provide the appropriate voltage levels to the components, and a servo motor controlled by the Arduino, potentially to actuate a mechanism in response to the load cell's readings.
Open Project in Cirkit Designer
This circuit is designed to measure weight using a load cell. The load cell's signals are amplified by the HX711 and then read by an Arduino Nano for further processing and potential output to a display or storage system.
Open Project in Cirkit Designer| Pin Name | Description |
|---|---|
| VCC | Power supply (2.6V to 5.5V) |
| GND | Ground |
| DT | Data output from HX711 to microcontroller |
| SCK | Serial clock input |
| E+ | Excitation+ for load cell |
| E- | Excitation- for load cell |
| A+ | Channel A positive input |
| A- | Channel A negative input |
| B+ | Channel B positive input (optional use) |
| B- | Channel B negative input (optional use) |
Connecting the Load Cell:
Powering the Module:
Interfacing with a Microcontroller:
#include "HX711.h"
// HX711 circuit wiring
const int LOADCELL_DOUT_PIN = 3;
const int LOADCELL_SCK_PIN = 2;
HX711 scale;
void setup() {
Serial.begin(9600);
scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
}
void loop() {
if (scale.is_ready()) {
long reading = scale.read();
Serial.print("Reading: ");
Serial.println(reading);
} else {
Serial.println("HX711 not found.");
}
delay(1000);
}
Q: Can I use multiple load cells with one HX711? A: Yes, but all load cells must be identical and wired in parallel, effectively creating a single load cell.
Q: How do I calibrate my load cell? A: Apply known weights and adjust the calibration factor in your code until the readings match the applied weights.
Q: What is the maximum rate at which I can get readings? A: The HX711 can be set to 10 or 80 samples per second (SPS).
Q: Can I use the HX711 for applications other than weight measurement? A: Yes, the HX711 can be used for any application that requires precise measurement of a resistive bridge sensor, such as pressure sensors or strain gauges.