Take a temperature reading from a TEMPer Gold USB thermometer/temperature sensor

tempergold.py

#!/usr/bin/env python3
import os
import select
import struct

DEV = '/dev/hidraw1'

def read_temperature(device_path=DEV):
    # Credit to https://github.com/urwen/temper for this byte sequence
    QUERY = struct.pack('8B', 0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00)
    
    # Open the device and return a file descriptor (needed for poll later)
    f = os.open(device_path, os.O_RDWR)
    
    # Write the "fetch temperature" query to the device
    os.write(f, QUERY)
    
    # Wait for the device to have data to read by polling the file descriptor
    poll = select.poll()
    poll.register(f, select.POLLIN)
    
    # This call blocks until data is ready
    poll.poll()
    poll.unregister(f)
    
    # Tempergold sends 16 bytes of data, read it and close the file
    data = os.read(f, 16)
    os.close(f)
    
    # Temperature is encoded as a big-endian (>) 2 byte integer (h)
    # https://docs.python.org/3/library/struct.html#format-characters
    # The encoded value represents degrees in c * 100
    return struct.unpack_from('>h', data, 2)[0] / 100

if __name__ == "__main__":
    print(read_temperature())

z_readme.md

tempergold.py

(Linux only)

Take a temperature reading from a TEMPer Gold USB device:

https://thepihut.com/products/temper-gold-original-usb-temperature-sensor

Usage:

Run from the shell with python3 tempergold.py

Use in your own scripts by placing your own script in a folder with this file:

import tempergold
# Read from the default device
print(read_temperature())
# Read from a specific device, useful if you have multiple
print(read_temperature('/path/to/your/device')

Note:

This script was written for Python 3, but should be compatible with Python 2. You may notice only whole integer temperatures are available for Python 2, where 2 decimal places are reported in Python 3. This is due to the differences in division between python 2 and 3

It is great, but I divided by 256 isted of 100 in order to show correct temperature.

@NotBobTheBuilder I like your means of data retrieval -- can I use it in temper.py? This is for ccweink/temper, which is a fork and continuation of urwen/temper. It's not very active, but it's more active than urwen/temper.

Of course - very happy you can make use of it!