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I redid everything. Cabling, connectors, etc. Now it works without hiccups so far. Probably some interference from a poor mains connection.

The sensor is hooked up in normal-mode and shouldn't be a parasitic-mode type. And no, unfortunately I don't own an oscilloscope nor have access to one. :( But what I thought to try next is to hook up something else behind the SSR and then troubleshoot the mains wiring in the kettle. Shouldn't...

Yeah, the sensor is directly connected to the GPIO and draws its power from the GPIO. I got three sensors and all have the same problem. I guess I'll just try out some other pi and re-do the installation to see if there is any help. If not, then I'll walk to the electronics store to get new...

Hi all, For some reason all my temperature readings freeze when the SSR for the heater is switched on. Any idea what could be wrong here? I'm using the Raspberry Pi 3 with the latest distro and DS18B20 sensors with a 4.7k pull-up. I've re-done all connections multiple times, tried changing...