I'm trying to use multiple DS18b20 temperature sensors:

import gpio // Sensors
import ds18b20 show Ds18b20 // Temperatursensor


GPIO-PIN-NUM1 ::= 2 // Outside Temperature GPIO
GPIO-PIN-NUM2 ::= 5 // Inside top Temperature GPIO

main:
  temp1 := gpio.Pin GPIO-PIN-NUM1 --input --pull-up=true //Temperature-sensor Outside
  ds1 := Ds18b20 temp1
  temp2 := gpio.Pin GPIO-PIN-NUM2 --input --pull-up=true //Temperature-sensor Outside
  ds2 := Ds18b20 temp2


  temperatur1 := ds1.read-temperature // Outside
  temperatur2 := ds2.read-temperature // Inside top

  print "Temperatur 1: $temperatur1"
  print "Temperatur 2: $temperatur2"

I found this comment in the ds18b20.toit lib but i honestly don't know how to make use of it.

Assumes there is only one sensor connected to the given $pin.
  If there are multiple sensors, then the driver misbehaves. In that
    case use $(Ds18b20.constructor --id --bus) instead.

Given that you use two different pins, the sensors aren't on the same bus.

If I want to use my approach, how can I fix this error? https://cdn.discordapp.com/attachments/1275347316160598088/1275351289634492568/image.png?ex=66c592f2&is=66c44172&hm=3d6ee21bd2d4c0d5f34adcc979a55fe23b98f586ac6e9629a3b7023a745fd055&

On a standard esp32?

Yes

Esp32s3 or esp32?

casual esp32

The one-wire protocol (used by the ds18b20) uses the RMT peripheral underneath. There is only a limited number of them available on the device (4 iirc). I thought that 1-wire takes two for each bus, but maybe it needs more. I will check later when I have a device at hand.

Okay, thank you! lmk as soon as you have any updates

I can not reproduce so far.

No, just the casual jaguar container is running

I can reproduce now. Was just a user error... Investigating

Thanks a lot!

While I'm looking: in the worst case you can just allocate and close the device inside the loop.

import gpio // Sensors
import ds18b20 show Ds18b20 // Temperatursensor


GPIO-PIN-NUM1 ::= 2 // Outside Temperature GPIO
GPIO-PIN-NUM2 ::= 5 // Inside top Temperature GPIO

main:
  temp1 := gpio.Pin GPIO-PIN-NUM1 --input --pull-up=true //Temperature-sensor Outside
  ds1 := Ds18b20 temp1
  temperatur1 := ds1.read-temperature // Outside
  print "Temperatur 1: $temperatur1"
  ds1.close
  temp1.close

  temp2 := gpio.Pin GPIO-PIN-NUM2 --input --pull-up=true //Temperature-sensor Outside
  ds2 := Ds18b20 temp2
  temperatur2 := ds2.read-temperature // Inside top
  print "Temperatur 2: $temperatur2"
  ds2.close
  temp2.close

It works perfectly fine like this:

Exactly. But I'm still investigating why two buses aren't supported. My gut feeling was that two were fine and there weren't.

Okay, I'll just go with that solution for now, if you get the other one to work aswell i would prefer that. Thank you for your help

Found it. It's a regression with recent releases. (A one character typo...). The next (or maybe the one after) release will have this fixed.

Thank you for your support!

Thank you for letting us know. The bug could have lingered for a while without your report.