Comments on: Connect DS18B20 temperature sensor to micro:bit

By: NAJIB

NAJIB — Tue, 09 May 2023 05:59:09 +0000

hi billy.. why i got data showed number of 4096..

what unit it use? is it degree celcius or else?

By: Juuso Lymy

Juuso Lymy — Mon, 16 Jan 2023 08:42:49 +0000

Sensors are Whadda (Velleman) WPSE324 and not fakes. Sensors are bought from a local store.

By: Bill

Bill — Thu, 04 Nov 2021 03:21:07 +0000

Hi — I’ve updated the extension and it now works with some of the sensors that hadn’t worked before. Can you try again with the newest version (v0.1.22 or later).

By: Bill

Bill — Thu, 30 Sep 2021 12:36:25 +0000

Thanks for sharing Ryan! I’m glad it’s working for someone. I haven’t gotten any samples of the non-working sensors, so I haven’t been able to try to identify what the problem is for all those who are having problems with it.

Bill

By: Juuso Lymy

Juuso Lymy — Sun, 12 Sep 2021 10:46:56 +0000

Micro:bit V1 works fine but V2 shows “infinity”. What could be wrong?

By: Ryan

Ryan — Fri, 10 Sep 2021 02:12:20 +0000

Hi all,

Extension works great!

I went through 4 different suppliers to find genuine DS18B20s. Some retailers were selling ‘genuine DS18B20′s’ which when tested using the Github link Bill provided, turned out to be fake.

By: Bill

Bill — Thu, 09 Sep 2021 13:28:27 +0000

@Juuso: The extension is very sensitive to timing. In my tests it has worked on the V2 with genuine Maxim sensors, but not with most of the “clones” that are sold as DS18B20s. If you let me know where you got your sensor, I may be able to identify what’s going wrong.

By: Juuso Lymy

Juuso Lymy — Sun, 05 Sep 2021 17:42:33 +0000

I have used ds18b20 tempsensor with Micro:bit V1 and it has work well with
a dstemp extension. The plot bar graph of temp p0 shows a temperature. But now I try to use Micro:bit V2 and can’t get it works. Only value is “Infinity”. No temperature. How can I make V2 works as well as V1?

By: shaby sheik

shaby sheik — Fri, 18 Jun 2021 22:30:56 +0000

Hi Bill
I get the – infinity, followed by “1 not connected”
This happens on a group of 10 external thermometers that I purchased via ebay (china I think).

By: Bill

Bill — Sat, 10 Apr 2021 22:35:47 +0000

Hi kim,

Did you get your sensor anywhere in North America? If so, can you let me know where so I can get one for debugging? (There are a lot of knockoffs that behave slightly differently. I may be able to fix the extension to work if I can do some testing with a non-working sensor)

You are also welcome to try to the “2 wire” version of the extension, which doesn’t use a resistor. Search for the “dstemp-2wire” extension in MakeCode. It’s a lot easier to connect in this mode. Directions are here: https://github.com/bsiever/microbit-dstemp-2wire. (That being said, if the normal, 3-wire approach didn’t work I doubt this one will either).