Boardoza HP303B Barometric Pressure and Temperature Sensor Breakout Board

The Boardoza HP303B Breakout Board is a compact and low-power digital barometric pressure and temperature sensor designed for applications requiring high accuracy and long-term stability. Based on a capacitive pressure sensing principle, the HP303B delivers precise measurements even under changing temperature conditions, making it suitable for demanding environmental sensing tasks.

Each HP303B sensor is individually calibrated at the factory and includes a 24-bit internal signal processor that converts raw sensor data into accurate pressure and temperature values. With support for both I²C and SPI communication, an integrated 32-sample FIFO, and optional interrupt functionality, this breakout board is ideal for IoT devices, wearables, mobile electronics, weather stations, altitude measurement systems, and battery-powered sensor nodes.

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Front Side	Back Side

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Key Features

• High-Accuracy Barometric Pressure Sensor: Designed for precise pressure and altitude measurements across a wide operating range.
• Integrated Temperature Measurement: Provides accurate ambient temperature data alongside pressure readings.
• Factory-Calibrated Sensor: Each HP303B device is individually calibrated, ensuring reliable and consistent output.
• Dual Communication Interface: Supports both I²C and SPI interfaces for flexible system integration.
• 32-Sample FIFO Buffer: Reduces host processor load by minimizing frequent data polling.
• Low Power Consumption: Optimized for battery-powered and low-energy applications such as wearables and IoT nodes.
• Interrupt Support: Optional interrupt signaling via the SDO pin for efficient event-driven designs.

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Technical Specifications

Model: HP303B
Manufacturer: Boardoza
Manufacturer IC: HOPERF
Functions: Digital Barometric Pressure and Temperature Sensor
Supply Voltage: 3.3 V – 5 V
Interface: I²C, SPI
Pressure Measurement Range: 300 hPa – 1200 hPa
Pressure Precision: ±0.005 hPa (high precision mode)
Relative Accuracy: ±0.06 hPa
Absolute Accuracy: ±1 hPa
Temperature Accuracy: ±0.5 °C
Pressure Temperature Sensitivity: 0.5 Pa/K
Measurement Time:

• Typical: 27.6 ms (standard mode, 16x)
• Minimum: 3.6 ms (low precision mode)

Average Current Consumption:

• Pressure Measurement: 1.7 µA @ 1 Hz
• Temperature Measurement: 1.5 µA @ 1 Hz
• Standby Mode: 0.5 µA

FIFO Buffer Depth: 32 samples
Operating Temperature: -40 °C to +85 °C
Board Dimensions: 20 mm x 20 mm

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Board Pinout

( J1 ) Main Connector

Pin Number	Pin Name	Description
1	3V3-5V	Positive Power Supply
2	SDO	I²C: Address LSB / Interrupt SPI: MISO / Interrupt
3	CSB	I²C: Not used (leave open) SPI: Chip Select
4	SDA	I²C: Serial Data SPI: MOSI (4-wire) / Data (3-wire)
5	SCL	I²C: Serial Clock SPI: Serial Clock
6	GND	Ground

Jumper Configuration

Jumper	Description
JP1, JP2	SPI mode: Open (default) I²C mode: Short
JP3	I²C Address 0x77: Open (default) I²C Address 0x76: Short

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Board Dimensions

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Step Files

Boardoza HP303B.step

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Datasheet

HP303B Datasheet

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Version History

• V1.0.0 – Initial Release

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Support

• If you have any questions or need support, please contact [email protected]

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License

This repository contains both hardware and software components:

Hardware Design

All hardware design files are licensed under Creative Commons Attribution-ShareAlike 4.0 International License.

Software/Firmware

All software and firmware are licensed under BSD 3-Clause License.