miekush / pico-fma-microforce-spi-mpy

Raspberry Pi Pico Honeywell FMA Microforce MicroPython Module

Raspberry Pi Pico Honeywell FMA Microforce SPI MicroPython Module

This is a Raspberry Pi Pico MicroPython module for the Honeywell FMA Microforce series force sensors using SPI interface

Example Usage

from machine import SPI, Pin
from microforce_spi import MicroForceSensor
import time

spi = SPI(0, 100000, sck=Pin(2), miso=Pin(4))

fma1 = MicroForceSensor(
    #pico spi pins
    spi, cs = 5,
    #25N
    force_range = 25,
    #20% -> 80%, see sensor datasheet
    transfer_func = 'C')

fma1.zero()

while 1: 
    status, force, temp = fma1.read()
    print("Status: " + status + ", Force: " + str(force) + " N, Temp: " + str(temp) + " °C")
    time.sleep(0.1)

Wiring

By default, Pico SPI instance 0 is used, however this can be changed in the constructor along with the MISO, SCK, and CS pins.

Breakout

To help with evaluation, I designed a simple breakout in KiCad that supports all variants of the FMA series. See the repo for design files and ordering info.

Installation

1. Clone repo to a folder of your choice
2. Copy the "microforce_spi.py" file to your Pico
3. Copy one of the example scripts or create your own following the example usage shown above
4. Enjoy! :)

License

MKE supports the open source hardware community by sharing hardware design files freely on GitHub!

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Designed by Mike Kushnerik (miekush)

Licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0

All text above must be included in any redistribution!