`mitutoyo`: A library for the Mitutoyo Digimatic (SPC) protocol.¶

CircuitPython implementation of the Mitutoyo Digimatic SPC interface.

Dependencies¶

This driver depends on:

Adafruit CircuitPython

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

Installing from PyPI¶

Note

This library is not available on PyPI yet. Install documentation is included as a standard element. Stay tuned for PyPI availability!

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install circuitpython-mitutoyo

To install system-wide (this may be required in some cases):

sudo pip3 install circuitpython-mitutoyo

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install circuitpython-mitutoyo

Usage Example¶

import board
import mitutoyo

instrument = mitutoyo.Digimatic(req=board.D0, clock=board.D1, data=board.D2)

reading = instrument.read()
print(reading)  # human formatted
print("Reading in %s: %f" %(reading.unit, reading.value))

Contributing¶

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

Table of Contents¶

Mitutoyo Caliper Readout¶

This example prints a connected Caliper’s value on the push of the ready button on the instrument.

examples/mitutoyo_caliper_readout.py¶

# This is a quick example how to read values from Mitutoyo Calipers.
# Assuming a Serpente board, with `req`, `clock`, `data` and `ready` connected to
# D0, D1, D2 and D3, respectively.

import time
import board
import digitalio
import mitutoyo

pin_ready = digitalio.DigitalInOut(board.D3)
pin_ready.direction = digitalio.Direction.INPUT
pin_ready.pull = digitalio.Pull.UP

print("Hello! Press the read button on the Calipers to print the value!")

meter = mitutoyo.Digimatic(req=board.D0, clock=board.D1, data=board.D2)

while True:
    # wait until ready goes low
    while pin_ready.value:
        time.sleep(0.1)

    reading = meter.read()
    if reading:
        print(reading)

    # wait until ready goes up again to just get a single reading per press
    while not pin_ready.value:
        time.sleep(0.1)

Mitutoyo Caliper USB CAD entry¶

This example types out the reading of a connected Caliper’s value on the push of the ready button on the instrument.

examples/mitutoyo_usb_cad_entry.py¶

# Direct CAD entry for Mitutoyo calipers via USB HID emulation.
# Assuming a Serpente board, with `req`, `clock`, `data` and `ready` connected to
# D0, D1, D2 and D3, respectively.

import time
import board
import digitalio
import mitutoyo

import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS

# I/O
pin_ready = digitalio.DigitalInOut(board.D3)
pin_ready.direction = digitalio.Direction.INPUT
pin_ready.pull = digitalio.Pull.UP

meter = mitutoyo.Digimatic(req=board.D0, clock=board.D1, data=board.D2)

# USB HID keyboard emulation.
time.sleep(1)
kbd = Keyboard(usb_hid.devices)
layout = KeyboardLayoutUS(kbd)

print("Ready.")

while True:
    # wait until ready goes low
    while pin_ready.value:
        time.sleep(0.1)

    reading = meter.read()
    if reading:
        print("Typing %s." % reading)
        layout.write(str(reading) + "\n")

    # wait until ready goes up again to just get a single reading per press
    while not pin_ready.value:
        time.sleep(0.1)