HX710B Air Pressure 0-40 kPa Sensor Module

The HX710B Air Pressure Sensor Module offers a high-precision, low-cost solution for measuring small changes in air or gas pressure. This compact module typically integrates a piezoresistive pressure sensor with the HX710B high-precision 24-bit Analog-to-Digital Converter (ADC). The ADC is specifically designed for weighing scales and pressure measurement, providing an extremely accurate digital output proportional to the applied pressure. With a measurement range of 0 to 40 kPa, the HX710B is perfectly suited for differential pressure sensing, barometric pressure monitoring, and measuring fluid levels through hydrostatic pressure, making it a valuable component for engineers and hobbyists in various diagnostic and environmental projects.

Key Features:

• High-Resolution ADC: We incorporate the HX710B 24-bit ADC, which delivers exceptional resolution and stability, allowing you to detect minute pressure changes accurately.
• Wide Measurement Range: The sensor accurately measures pressure from 0 to 40 kPa (kilopascals), covering a substantial range for many non-invasive applications.
• Digital Output: The module provides a simple two-wire digital serial interface (Data and Clock), significantly simplifying communication with microcontrollers like Arduino or ESP32.
• Low Power Consumption: This efficient design makes the sensor ideal for battery-powered and portable devices, conserving power during operation and standby.
• Temperature Compensation: Built-in circuitry minimizes the impact of temperature variations on pressure readings, ensuring consistent performance across different environments.
• Onboard Signal Amplification: The integrated circuitry amplifies the small voltage signal from the pressure sensor bridge, providing a strong, clean signal to the ADC.

Technical Specifications:

• Sensor Type: Piezoresistive Pressure Sensor
• ADC Chip: HX710B
• Pressure Range: 0-40 kPa (approx. 0-5.8 PSI)
• Operating Voltage: 3.3V to 5V DC (varies by breakout board)
• Logic Level: Compatible with 3.3V and 5V microcontrollers
• Communication: 2-wire Serial Interface (Data/Clock)
• Resolution: 24-bit Analog-to-Digital Conversion

Mechanical Specifications:

• Port Type: Single barbed air inlet/outlet suitable for flexible tubing (typically 3mm or 5mm inner diameter).
• Mounting: Standard solder pads or pin headers for breadboard or PCB mounting.
• Design: Compact breakout PCB with the sensor and ADC chip.

Dimensions:

• Board Length: ~25 mm
• Board Width: ~15 mm
• Board Thickness: ~5 mm (excluding port height)

Pinout and Wiring:

• VCC: Power Supply Input (connect to 3.3V or 5V on the microcontroller).
• GND: Ground connection.
• CLK (SCK): Serial Clock input from the microcontroller.
• DATA (DOUT): Serial Data output to the microcontroller.
• Wiring Note: Connect VCC and GND for power. Link the DOUT pin to a digital input on your microcontroller and the SCK pin to a digital output, then use a specialized HX710B library to read the pressure values.

Datasheet Reference:

• Download HX710B Datasheet

Commonly Used in:

• Weather Stations: Monitoring barometric pressure for forecasting and environmental data collection.
• Medical Devices: Used in non-invasive pressure monitoring systems, like simple blood pressure meters.
• Aviation Projects: Building rudimentary altimeters or drone flight control systems that rely on atmospheric pressure.

Applications:

• Water/Liquid Level Sensing: Measure hydrostatic pressure at the bottom of a tank to determine liquid level.
• Differential Pressure Sensing: Detect pressure drops across filters or flow restrictions in HVAC or ventilation systems.
• Gas Flow Monitoring: Monitor low-pressure gas flows in laboratory or environmental setups.
• Altimeters: Calculate altitude changes based on atmospheric pressure variations.

Equivalent Models:

• MPX-series (e.g., MPX4115A): Analog pressure sensors from NXP that require an external ADC, offering a different trade-off in complexity and precision.
• BMP280/BME280: Digital barometric pressure sensors from Bosch, commonly used in altitude sensing, though typically with a higher maximum pressure range.

Package Includes:

• 1 x HX710B Air Pressure 0-40 kPa Sensor Module