HX711 24-Bit Precision Dual-Channel Module For Load Cell

HX711 24-Bit Precision Dual-Channel Module for Load Cell is a dedicated analog-to-digital converter (ADC) module engineered specifically for high-accuracy electronic weighing and force measurement applications. This module integrates the Avia Semiconductor HX711 chip, which directly interfaces with wheatstone bridge-based sensors, such as load cells and pressure sensors. Consequently, it eliminates the need for external signal conditioning and amplification stages, greatly simplifying your design. The HX711 offers a remarkable 24-bit resolution, enabling developers to capture minute changes in weight or force with exceptional precision. Therefore, utilize this module to build accurate digital scales, industrial weight measurement systems, and other sensitive instrumentation.

Key Features:

• 24-Bit High Resolution: Provides a massive dynamic range and fine granularity, capturing highly accurate weight data with ≥ 1,000,000 counts of resolution.
• Dual Selectable Differential Channels: Features two analog input channels (A and B). Channel A offers selectable gains of 128 or 64, while Channel B has a fixed gain of 32 for battery voltage measurement or secondary inputs.
• Integrated Low-Noise PGA: The built-in Programmable Gain Amplifier (PGA) provides high-gain amplification specifically optimized for the low-level differential output of load cells.
• Simple Digital Interface: Uses a compact, two-wire serial interface (Clock and Data) for easy communication with microcontrollers like Arduino, minimizing required GPIO pins.
• Power-Down Mode: Supports a power-down mode, which significantly reduces current draw during periods of inactivity, making it suitable for battery-powered devices.

Technical Specifications:

• ADC Resolution: 24 Bits (No missing codes)
• Input Channels: 2 Differential Inputs (Channel A and Channel B)
• Selectable Gain (Channel A): 64 or 128
• Fixed Gain (Channel B): 32
• Output Data Rate: Selectable between 10 Hz and 80 Hz (Default 10 Hz)
• Operating Supply Voltage: 2.6 V to 5.5 V DC
• Interface Type: 2-Wire Serial (SCK, DOUT)
• Operating Current: ≈ 1.5 mA (Typical)

Mechanical Specifications:

• Main IC: Avia Semiconductor HX711
• Package Type: Small PCB module with breakout pins.
• Connection: Standard 2.54 mm (0.1 in) pin headers for easy interfacing.
• Mounting: Includes mounting holes for secure installation within an enclosure.

Dimensions:

• Module Length: ≈ 38 mm
• Module Width: ≈ 21 mm
• Pin Pitch: 2.54 mm (0.1 in)
• Weight: ≈ 4 g (Extremely lightweight)

Pinout and Wiring:

• VCC/VDD: Connect to the 5 V or 3.3 V positive power supply.
• GND: Connect to the circuit ground reference.
• SCK (Serial Clock): Input clock signal provided by the microcontroller to retrieve data.
• DOUT (Data Output): Output data signal from the HX711 to the microcontroller.
• E+/E-: Excitation Voltage for the load cell (Positive and Negative connection).
• A+/A-: Analog Input Channel A (Positive and Negative signal wires from the load cell).
• Wiring Note: Connect the load cell’s four or six wires (Excitation and Signal) directly to the corresponding E and A pins on the module.

Datasheet Reference:

• Download Avia Semiconductor HX711 Datasheet

Commonly Used in:

• DIY Digital Scales: The preferred interface for building highly accurate kitchen, postal, or platform scales with Arduino or ESP32.
• Industrial Weighing Systems: Integrated into low-cost industrial monitoring equipment for hopper or tank weight measurement.
• Force Sensing Projects: Used with pressure sensors or strain gauges to measure compression or tension forces in robotics and testing.

Applications:

• Laboratory Instruments: Provides precise measurement for laboratory balances and material testing setups.
• Smart Bins and Inventory Systems: Automatically track the weight of contents in bins or shelves for inventory management.
• Human-Machine Interfaces: Capturing force data from joysticks or hand grips for custom control applications.

Equivalent Models:

• AD7799 (Analog Devices): A highly precise, low-noise 24-bit ADC often used for load cell interfaces, however, it typically requires more complex external components than the pre-integrated HX711 module.
• NAU7802 (Nuvoton): A modern, ultra-low-power 24-bit ADC for weigh scales, offering competitive performance and smaller package size.
• SGM706-24 (SGMicro): Another 24-bit solution designed specifically for weigh scale applications, furthermore, it is pin-compatible with some competing solutions.

Package Includes:

• 1 x HX711 24-Bit Precision Dual-Channel Load Cell Module