HX711 

HX711 Key Features

1. High Precision ADC: The heart of the HX711 is its 24-bit sigma-delta ADC, which allows for extremely high resolution in digital weight readings. This level of precision makes the HX711 suitable for applications where even small weight variations need to be detected and measured.

2. Programmable Gain Amplifier (PGA): The HX711 includes a PGA with selectable gain levels of 32, 64, and 128. This feature enables users to adjust the amplifier’s gain based on the characteristics of their sensors, optimizing the measurement range and sensitivity.

3. Two Differential Input Channels: The HX711 is designed to interface with load cells or strain gauges through its two differential input channels. This allows for the measurement of both positive and negative signals, enhancing the flexibility of the device.

4. Digital Output: The HX711 communicates with external microcontrollers or processors through a two-wire serial interface. This digital output simplifies integration into various projects and facilitates communication with popular platforms such as Arduino.

5. Low Noise and Drift: To ensure accurate and stable readings, the HX711 is designed with low noise and low drift characteristics. This is crucial for applications where long-term stability and precision are paramount.

Connecting the HX711

The HX711 is typically connected to a microcontroller or a development board like Arduino. The wiring involves connecting the HX711’s power and ground pins, as well as the data and clock lines, to the corresponding pins on the microcontroller. Additionally, the load cells or strain gauges are connected to the amplifier’s input channels.

Library Support:

To facilitate the integration of the HX711 with popular development platforms, various libraries have been developed. These libraries provide functions to initialize the amplifier, read data, and handle calibration. Arduino, in particular, has a well-established HX711 library that simplifies the implementation of weight measurement applications.

Calibration and Tare

Calibrating the HX711 is a crucial step to ensure accurate weight measurements. This involves determining the scale factor by weighing known masses and adjusting the system accordingly. Tare functionality is also essential for zeroing out any offsets caused by the weight of containers or other non-measurable components.

Applications

1. Load Cells and Scales: The HX711 is commonly used in load cells and scales for applications such as industrial weighing, kitchen scales, and medical equipment.

2. Force and Pressure Sensors: By integrating the HX711 with appropriate sensors, it can be used to measure force and pressure in applications like material testing or industrial automation.

3. IoT and Embedded Systems: The HX711’s digital output and compatibility with microcontrollers make it suitable for integration into IoT devices and embedded systems that require precise weight measurements.

4. Data Logging: In combination with a microcontroller and data storage, the HX711 can be used for continuous weight monitoring and data logging in various environments.

HX711 Data Sheet

Please contact us to download the HX711 Datasheet file.

Electrical Characteristics:

1. Input Voltage Range:

   • Typically, the HX711 operates from 2.6V to 5.5V.

2. Low Noise Programmable Gain Amplifier:

   • Programmable gains of 32, 64, and 128.

3. ADC Resolution:

   • 24 bits.

4. Selectable Data Rate:

   • The HX711 supports two data rates: 10 Hz and 80 Hz.

5. Operating Current:

   • The operating current is typically around 1.6 mA.

HX711 Datasheet Features:

1. On-Chip Voltage Regulator:

   • The HX711 has an on-chip regulator that stabilizes the supply voltage for the ADC.

2. Digital Interface:

   • The data is read serially via a two-wire interface (Clock and Data).

3. Selectable Channel A or B:

   • The HX711 has two differential input channels, A and B.

4. Tare Function:

   • The Tare function allows the subtraction of a known weight value from the measurement.

5. On-Chip Oscillator:

   • The HX711 includes an internal oscillator.

6. Zero Drift:

   • The ADC has minimal zero-drift.

Pin Configuration:

1. Digital Input/Output Pins:

   • DT (Data) and SCK (Clock) are the digital pins used for communication.

2. Analog Input Pins:

   • E+ and E- are the inputs for the bridge sensor.

3. Power Supply Pins:

   • VCC and GND are the power supply pins.