MAX31855 Driver

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deshipu
Posts: 1384
Joined: Thu May 28, 2015 5:54 pm

MAX31855 Driver

Post by deshipu » Wed Feb 08, 2017 11:19 pm

I made a driver for the MAX31855 thermocouple amplifier. The code is at https://bitbucket.org/thesheep/micropython-max31855

Primesty
Posts: 38
Joined: Sun Jun 28, 2020 11:06 pm

Re: MAX31855 Driver

Post by Primesty » Fri Sep 25, 2020 3:14 pm

Hey deshipu the link for the max31855 driver is not working anymore. Does anyone happen to have the raw .py driver file they’d be willing to share with me and/or are aware of another driver that works for the adafruit max31855 thermocouple breakout?

I’d appreciate it!

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mcauser
Posts: 490
Joined: Mon Jun 15, 2015 8:03 am

Re: MAX31855 Driver

Post by mcauser » Sun Sep 27, 2020 11:58 am

Deshipu's bitbucket is missing heaps of repositories, now that Atlassian has dropped mercurial support.
https://bitbucket.org/blog/sunsetting-m ... -bitbucket

Hi @deshipu, I cloned heaps of your repos, so if you've lost anything, I may have a copy that I can zip and send back.

Primesty
Posts: 38
Joined: Sun Jun 28, 2020 11:06 pm

Re: MAX31855 Driver

Post by Primesty » Sun Sep 27, 2020 2:19 pm

Hi guys,

Thanks for all the input here. I'll def check it out.

I was actually to get it to work without a 'real' driver on my ESP31 (MicroPython v1.13) based on this old adafruit document:

https://cdn-learn.adafruit.com/download ... evices.pdf

Code: Select all


from machine import Pin, SPI
import time

cs = Pin(13, Pin.OUT)

spi = SPI(-1, baudrate=5000000, polarity=0, phase=0, sck=Pin(5), mosi = Pin(10), miso=Pin(4))
# MOSI has to be defined BUT is not needed to read data


def read_temp(cs, spi):
    while True:
        try:
            data = bytearray(4)
            cs.value(0)
            spi.readinto(data)
            cs.value(1)
            print(data)
            temp = data[0] << 8 | data[1]
            if temp & 0x0001:
                return float('NaN')
            temp >>= 2
            if temp & 0x2000:
                temp -= 16384
            print(temp * 0.25)
        except:
            pass
        time.sleep(1)

read_temp(cs, spi)

This works surprisingly well even when I run it in an async application with uasyncio.

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deshipu
Posts: 1384
Joined: Thu May 28, 2015 5:54 pm

Re: MAX31855 Driver

Post by deshipu » Mon Sep 28, 2020 7:50 am

By the way, all the deleted Bitbucket repos have been archived by Software Heritage, for example: https://bitbucket-archive.softwareherit ... 31855.html

Corruptsector
Posts: 4
Joined: Mon Nov 02, 2020 9:12 am

Re: MAX31855 Driver

Post by Corruptsector » Mon Nov 02, 2020 9:15 am

Does anyone have a copy of these files. I got the archive version but its made it a py.l file and it looks like a binary. Sorry if this is a stupid question but does anyone know how to use the archive file at https://bitbucket-archive.softwareherit ... ory.tar.gz

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pythoncoder
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Location: UK
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Re: MAX31855 Driver

Post by pythoncoder » Mon Nov 02, 2020 9:28 am

I think you've downloaded the wrong file. I can't open this file.

In general under Linux you can just browse to the file with your favourite file manager, double-click on it and it will be opened using archive manager. But it doesn't work for this file which appears empty. I can't answer for Windows or OSX.
Peter Hinch

Corruptsector
Posts: 4
Joined: Mon Nov 02, 2020 9:12 am

Re: MAX31855 Driver

Post by Corruptsector » Mon Nov 02, 2020 9:36 am

Thanks for the quick reply. But if i click on the link provided by deshipu and download the repo, thats the file i get. A tar.gz that when i extact has all sorts of off files in it. I think maybe its a Mercurial thing, but not sure how to get the driver out of that file.

Any help appreciated. It looks like all links to this driver are dead.

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pythoncoder
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Re: MAX31855 Driver

Post by pythoncoder » Mon Nov 02, 2020 9:42 am

That's a puzzler. I can open other tar.gz files with no problem, but not the one you linked which appears empty.

As for the driver I haven't used it. Hopefully someone who has will chip in.
Peter Hinch

Corruptsector
Posts: 4
Joined: Mon Nov 02, 2020 9:12 am

Re: MAX31855 Driver

Post by Corruptsector » Mon Nov 02, 2020 9:46 am

Thanks Peter. there is a .hg folder which might be hidden in linux.

Then under .hg\store\data there is max31855.py.i but no idea what next.

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