MicroPython Forum (Archive)

Will try and see if that helps, thanks. The reason for the extra delay time is that I wanted the frequency of the updates to be approximately every 15 seconds vs 750ms.

For some strange reason, when the temperature gets around -24C/-12F (monitoring the temperature of a freezer) I occasionally get an invalid 85C/185F reading (happens around every handful or so of hours.) I originally believed it to be an issue with the cable I made up, so I made another assembly wit...

I'm using a D1 board with the Arduino Uno form-factor and powering it with a 12V wall wart thru the barrel jack. I've also taken to opportunity to update the firmware to the latest version.

Just to clarify ... swap sensors and see if the problem moves to the other pin. Have you also tried setting up just one 1-wire pin and seeing if that specific sensor still faults? 4K7 pull-up and normal mode? Good luck! Yes to both 4K7 pull-up and normal mode. Up until recently I was just using one...

kevinkk525 wrote: ↑

Tue Mar 30, 2021 5:21 am

You might need to catch "onewire.OneWireError"

That works! Thanks!

IIRC I had the same issue when using another sensor some time ago before I swapped it out for the current one (think the reason for swapping was that I wanted a longer cable.)

With the catch-all exception handling? Nope, it handles failed reads without a problem (I'm triggering read failures by disconnecting a data lead running to a sensor as it can be quite some time for it occur on its own.) Here's what I get when I leave out the exception handling and trigger a read fa...

Might try putting the scan in the loop. I have each sensor on a different i/o pin.

I initially had the exception handling as a catch-all: But apparently, a major side-effect of that is that I can't kill it with CTRL+C.

I'm taking readings every 15 seconds. Anyways I'll go ahead and post the entire code if that's of help: def go(): import time import machine import urequests import network import onewire, ds18x20 sta_if = network.WLAN(network.STA_IF) dat = machine.Pin(12) ds = ds18x20.DS18X20(onewire.OneWire(dat)) ...

I do.