This is an adapter for reading the Range Dial probe directly. Range Dial probes do not have the circuitry to work with the microphone port anymore, hence this workaround. The adapter consists of two parts:

• server.py - a server that connects to the Dial over BLE and writes out temperature reading to a local file.
• reader.py - a reader that read the local file with temp reading and prints them in a format suitable for artisan (you can also do just cat <tempfile>)

This only works on Mac as the BLE library only works on Mac.

$ pip install pyobjc Adafruit_BluefruitLE

First start the server and wait for the device to connect:

$ ./server.py RangeWhite24 /tmp/artisan.log
INFO:root:searching for UART device RangeWhite24
INFO:root:connecting to RangeWhite24 [2d188e3c-a4cb-4a8b-9f86-bc4f813dc7fb]

The RangeWhite24 is the name of the BLE device (it can change) and /tmp/artisan.log is the file for temp readings. You can now print the current temperature in F:

$ cat /tmp/artisan.log
69.782

In Artisan go to Config > Device, select Prog, and put in cat /tmp/artisan.log. Artisan should now take temperature readings from the file. Don't forget to start the server.py before roasting. The server stops automatically when you disconnect the probe from Dial.

The Dial protocol isn't documented, but it's fairly easy to understand:

# The Range sends three types of messages.
# First byte defines the message types:
#  * 'D' is initialization message
#  * 'V' is some kind of control device followed by 2 bytes
#  * 'T' is temperature data followed by 4 bytes
# The Range dial has two ports for temperature sensors, upper and lower.
#  * When the upper port is used, the first two bytes will be set to '\x81\x0c'.
#  * When the lower port is used, the last two bytes will be set to '\x81\x0c'.
# The temperature is a fixed-point number in celsius, e.g. 2868 equals to 28.68 degrees C