Introduction

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CircuitPython library to support Honeywell MPRLS digital pressure sensors.

Dependencies

This driver depends on:

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Usage Example

import time
import board
import busio
import adafruit_mprls

i2c = busio.I2C(board.SCL, board.SDA)

# Simplest use, connect to default over I2C
mpr = adafruit_mprls.MPRLS(i2c, psi_min=0, psi_max=25)


while True:
    print((mpr.pressure,))
    time.sleep(1)

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Building locally

Zip release files

To build this library locally you’ll need to install the circuitpython-build-tools package.

python3 -m venv .env
source .env/bin/activate
pip install circuitpython-build-tools

Once installed, make sure you are in the virtual environment:

source .env/bin/activate

Then run the build:

circuitpython-build-bundles --filename_prefix adafruit-circuitpython-mprls --library_location .

Sphinx documentation

Sphinx is used to build the documentation based on rST files and comments in the code. First, install dependencies (feel free to reuse the virtual environment from above):

python3 -m venv .env
source .env/bin/activate
pip install Sphinx sphinx-rtd-theme

Now, once you have the virtual environment activated:

cd docs
sphinx-build -E -W -b html . _build/html

This will output the documentation to docs/_build/html. Open the index.html in your browser to view them. It will also (due to -W) error out on any warning like Travis will. This is a good way to locally verify it will pass.

Table of Contents

Simple test

Ensure your device works with this simple test.

examples/mprls_simpletest.py
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import time
import board
import busio
import adafruit_mprls

i2c = busio.I2C(board.SCL, board.SDA)

# Simplest use, connect to default over I2C
mpr = adafruit_mprls.MPRLS(i2c, psi_min=0, psi_max=25)

# You can also specify both reset and eoc pins
"""
import digitalio
reset = digitalio.DigitalInOut(board.D5)
eoc = digitalio.DigitalInOut(board.D6)
mpr = adafruit_mprls.MPRLS(i2c, eoc_pin=eoc, reset_pin=reset,
                           psi_min=0, psi_max=25)
"""

while True:
    print((mpr.pressure,))
    time.sleep(1)

adafruit_mprls

CircuitPython library to support Honeywell MPRLS digital pressure sensors

  • Author(s): ladyada

Implementation Notes

Hardware:

Software and Dependencies:

class adafruit_mprls.MPRLS(i2c_bus, *, addr=24, reset_pin=None, eoc_pin=None, psi_min=0, psi_max=25)

Driver base for the MPRLS pressure sensor :param i2c_bus: The busio.I2C object to use. This is the only required parameter. :param int addr: The optional I2C address, defaults to 0x18 :param microcontroller.Pin reset_pin: Optional digitalio pin for hardware resetting :param microcontroller.Pin eoc_pin: Optional digitalio pin for getting End Of Conversion signal :param float psi_min: The minimum pressure in PSI, defaults to 0 :param float psi_max: The maximum pressure in PSI, defaults to 25

pressure

The measured pressure, in hPa

Indices and tables