proteus iat and clt sensor drops temp when power apply

Hardware inside and outside of the ECU
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subzero
Posts: 12
Joined: Fri Mar 11, 2022 12:48 pm

proteus iat and clt sensor drops temp when power apply

Post by subzero »

hello on my build i use 2 bosch iat and clt sensors
with usb shows exact temp.when power is applied temp drops
Krakert
Posts: 38
Joined: Sat Jan 02, 2021 5:31 pm
Location: Heemskerk
Github Username: Krakert

Re: proteus iat and clt sensor drops temp when power apply

Post by Krakert »

I do have that same symptom on my Proteus as well, but readings are good when 12V is applied to the board
NickZ
Posts: 56
Joined: Sun Sep 01, 2019 9:44 pm

Re: proteus iat and clt sensor drops temp when power apply

Post by NickZ »

Im running my own hardware, but mine does the same. I've just calibrated to the correct value when the car is running. I would say its a firmware thing and maybe to do with the voltage conversion for the battery sense on the 12v
mck1117
running engine in first post
running engine in first post
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Location: Seattle-ish

Re: proteus iat and clt sensor drops temp when power apply

Post by mck1117 »

Calibrate while the board is supplied with 12v. It doesn't know that the sensors don't have an accurate 5v pullup when the 12v ignition supply isn't active, so it reads wrong. When powered over USB, the 5v rail is really more like 4.6 volts due to the diode drop in the protection circuitry.
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