Problems with ds18b20

[rvinaso]

Hi my friends I am having a trouble with my sensor ds18b20 and my code, after a few measures, suddenly the program stops and shows:
File ds18x20.py, Line 40 in read_temp
File ds18x20.py, line 30 in read_scratch
Excetpion:crc error

[jimmo]

Hi my friends I am having a trouble with my sensor ds18b20 and my code, after a few measures, suddenly the program stops and shows:
File ds18x20.py, Line 40 in read_temp
File ds18x20.py, line 30 in read_scratch
Excetpion:crc error

This suggests that there is possibly a wiring issue and messages from the sensor are being corrupted (or possibly there's a timing issue decoding it).

If it only happens occasionally, then maybe just catch the exception and retry:

Code: Select all

try:
  sensor.read_temp()
except:
  ...handle error? Maybe retry?