tuckie / max31855 Goto Github PK

I just posted a comment in the thread on the Raspberry Pi forums outlining this (http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=18125) but the readme in V2.0 does not specifically state that the pin number you select must be the GPIO labeling.

I'm struggling with getting the test code to work. I'm just using the initial code which is as follows:

from max31855 import MAX31855, MAX31855Error

cs_pin=24
clock_pin=23
data_pin=22
unit="f"
thermocouple1=MAX31855(cs_pin, clock_pin, data_pin, units)
print(thermocouple.get())
thermocouple.cleanup()

When I run this code on my RPi using Idle I get the following error:

NameError: name 'thermocouple' is not defined...

I looked in MAX31855.py for a function or class defined as 'thermocouple' and do not see one. Can anyone tell me what simple thing I am doing wrong here?

Thanks in advance.

After a fresh install of Raspbian and the required dependencies, user 'pi' does not have access to /dev/spidev0.1, even though it is shown in /dev/.

All references of the print command must have parenthesis added to them, as quick2wire seems to have changed to python3.

Hi

I'm trying to install your max31855's module to use two "k thermocouples" on a Raspberry pi 3 under Raspbian 10.0.
The installation seems to be ok...
When I call it in Python 3 :

>>> import max31855
>>>

I don't have any error message.

Here is the python script that I use to check the sensor :

   # from max31855 import MAX31855, MAX31855Error
    import max31855

    cs_pin=24
    clock_pin=23
    data_pin=22
    unit="f"
    thermocouple1=MAX31855(cs_pin, clock_pin, data_pin, units)
    print(thermocouple.get())
    thermocouple.cleanup()

Any time, I have the same message error :

Traceback (most recent call last):
  File "Essai_MAX31855_V1.py", line 8, in <module>
    thermocouple1=MAX31855(cs_pin, clock_pin, data_pin, units)
NameError: name 'MAX31855' is not defined

Do you have any idea ?

Thank you :-)

To cope with universal clock pins, the clock needs to be initialised low, otherwise the first bit is lost and all bits are offset by one.

Recommend after initialising self.cs HIGH to add:
# Initialise clock low
GPIO.output(self.clock_pin, GPIO.LOW)

Trying to make the max6675 module work on a Raspberry Pi 1. I needed to add a small sleep between init and get.
time.sleep(0.2)
is sufficient. If I do not sleep, I just read 0 or rather the last value successfully read. Until I first added the sleep I read 0, if I remove it now, I read the last value read.