SparkFun
SparkFun Pressure Sensor - BMP581 (Qwiic)
The SparkFun Qwiic BMP581 Pressure Sensor is a standard-sized, 1in. by 1in. absolute pressure sensor breakout from Bosch Sensortec. The BMP581 boasts excepti...
The SparkFun Qwiic BMP581 Pressure Sensor is a standard-sized, 1in. by 1in. absolute pressure sensor breakout from Bosch Sensortec. The BMP581 boasts exceptional resolution (down to 1/64Pa) and accuracy while maintaining on-chip linearization and temperature compensation to provide true absolute data for pressure and temperature. The Qwiic Pressure Sensor communicates over I2C by default, utilizing our handy Qwiic Connect System so no soldering is required to connect it to the rest of your boards. However, we still routed the I2C signals out to a set of 0.1”-spaced pins for users who prefer a soldered connection. You can also configure the board to communicate over SPI using the same 0.1"-spaced pins.
The BMP581 has a wide pressure sensing range (30 to 125kPa) with excellent accuracy across the sensing range (± 0.5hPa (max)), as well as output data rates up to 622Hz (we have only regularly achieved 500Hz in testing, though). The sensor includes a configurable oversampling setting, FIFO buffer for storing up to 32 pressure samples, programmable low-pass filtering and even 6-bytes of user-programmable non-volatile memory. All of this allows you to customize the performance based on your application's requirements. Even without filtering, the BMP581 has very low noise (< 0.1Pa RMS).
The sensor has five operating modes: Normal, Forced, Continuous, Standby, and Deep Standby. Deep Standby consumes the least amount of current at just 1.5µA (typical) and peak current consumption by the sensor is 260µA.
The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.
Features:
- Supply Voltage Range: 1.71V - 3.6V
- Current Draw:
- 260µA - Max draw during measurements
- 1.3µA - at 1 Hz in Low Power Mode
- 0.55µA - Absolute minimum in Deep Standby mode
- Data Transfer Rates:
- I2C - 1MHz
- SPI - 12MHz
- 6-bytes of Non-Volatile Memory
- Pressure Sensing Range: 30 - 125kPa
- Pressure Data Resolution: 1/64Pa
- Absolute Pressure Accuracy: ±0.5hPa
- Temperature Sensing Range: -40 - 85 °C
- Output Data Rate: 0.125 - 240Hz (Normal Mode)
- Max Output Data Rate: 622Hz (Continuous Mode, 1x Oversampling)
- I2C Address: 0x47 (Default), 0x46 (Alternate)
- 2x Qwiic Connectors
Documents:
- Schematic
- Eagle Files
- Board Dimensions
- Hookup Guide
- Datasheet (BMP581)
- Qwiic Information Page
- Arduino Library
- GitHub Hardware Repo
Videos
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- FIFO
- FIFO stands for “first in, first out” and is a small memory buffer inside the sensor that stores recent readings in order. This matters because it can help capture motion data without the microcontroller needing to read the sensor every single instant.
- oversampling
- Taking many measurements and combining them to reduce noise and improve the stability of a reading. It matters when you want smoother current or power measurements, though it can make updates slower.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- RMS
- RMS is a way of describing the effective level of an AC signal, such as an audio output voltage. It helps compare audio output levels more meaningfully than a peak voltage number.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- Temperature compensation
- Temperature compensation means the sensor adjusts its readings to reduce errors caused by changes in water temperature. This matters for field monitoring because ponds, rivers, and tanks can vary in temperature throughout the day and across seasons.
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Sensors & Input
SparkFun BMP581 Qwiic Schematic
Schematic · 139.6 KB · Click any page to view full size
BMP581 Datasheet
Datasheet · 2.8 MB · Click any page to view full size
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