Gen7 thermistors not working

Hi

I'm so close to having my Gen7 2.0 complete and my printer working once again! Very exciting times. However both my thermistors are consistently reading 0, and not changing despite the hot end heating up very hot. I have checked for shorts and am pretty positive there aren't any. The thermistor is getting 3.3V as expected too. I may have missed something obvious in the config, but my old firmware had it set for an EPCOS 100k, as it is in Teacup. Any suggestions would be much appreciated

Excellent opportunity to start a thermistor troubleshooting wiki page! See [www.reprap-diy.com]

Type of thermistor doesn't matter too much. They all work by the same principle, just their readings vary somewhat (which matters later).

What do these pins read on your Gen7?

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Wow, thanks for that! They're both reading 3.3V with no thermistor, and then dropping slightly with one installed (though quite insignificantly, but my multimeter is rubbish) and then down to very low readings when heated by a lighter. So seeing as the hardware is pretty much as expected, I had another look at the software and it turns out that one pin is working correctly, but the other is reading low. Say, 2.5 when the thermistor is warmed slightly and 1 otherwise. Whereas the other is reading approx 25 degrees at room temperature, which was the old behaviour.

Quote
hglaeser
it turns out that one pin is working correctly, but the other is reading low. Say, 2.5 when the thermistor is warmed slightly and 1 otherwise. Whereas the other is reading approx 25 degrees at room temperature, which was the old behaviour.

D'oh, I just see that one commit [github.com] didn't make it to the master branch, yet. Some pins (one analog pin, but not the other) were shifted between the first prototype and the released Gen7.

Will fix this later today. Until then you can apply this commit manually or simply use the experimental branch: [github.com]

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Silence? Looks like it's working now. Fine. :-)

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Sorry, I haven't quite gotten around to updating the firmware. But the fix seems sensible and I'll try have a look at it tomorrow