Automate Your Home Using Go: (page 58) temperature values fluctuating between negative and positive values

Pragmatic Bookshelf PragProg Customers
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1

I have created the example temperature polling application on a Raspberry Pico W and it is working, however, the reported temperature switches between positive and negative values like this:

```
❯ curl http://192.168.1.241
{“tempC”:31.351,“tempF”:88.4318}%
❯ curl http://192.168.1.241
{“tempC”:-31.845,“tempF”:-25.321000000000005}%
```

At first I thought maybe this was because of a flaky sensor, but I get the same behaviour when I flash the application to another Raspberry Pico.

Any idea why this would happen?

2

From what I read the onboard sensor on the Pico is not very reliable, so I added an external sensor (DHT11) to the Pico and changed the source code to use that one instead of the onboard sensor. Now things are much better (and I have a humidity reading as well as the temperature).