So I just found out why my Ultimaker temp measurements are off. Turns out some idiot thought referencing the ADC to USB +5V was a good idea.
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Replying to @marcan42
Typical arduino coder: why use the built-in accurate voltage reference when you can use USB VBUS? Yeah, let's do that.
7 replies 6 retweets 35 likes -
Replying to @marcan42
I can't believe I'm the first one to notice this. Way to put a fancy thermocouple and preamp IC and then completely *destroy* accuracy.
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Replying to @marcan42
Yea, the +5V from Usb is super noisy! I once neeed it and had to use big inductors/caps to filter it.
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You should in any case use a (LDO) voltage regulator. It's already there on the Arduino boards anyway.
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Replying to @hennichodernich @JoeRohd
I wound up jumpering +12V to VIN to power the Arduino from the main power supply. Apparently there's a jumper for this on newer boards.
1:40 PM - 13 Jun 2017
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