Technical > Wiring & Sensors

Air and Coolant temp sensor scaling

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Sprocket:
I am tryig to configure the coolant and air temp sensors, and again im finding it difficult to understand the process. Can anyone help please.

The coolant sensor measures aproximately 2050 ohms at 25c and the air temp also measures roughly 2050 at 25c. These are standard Rover sensors.

What do i need to do? I know the coolant temp is not reading right :-\

rob@vems.co.uk:
Have you tried tempsensor_upload?

If not :-
In a command window in the root directory of the the VEMS firmware type:

download-config
tempsensor_upload 2252 2252 256

Then take a look at how your values are looking.

Sprocket:
I'll give that a go ;D

Sprocket:
I have as well as uploading the 2252 airX and 2252 clt hex files, i have upgraded to 1.0.73 firmware from 1.0.71.

However, the temperature still reads out the same amount, so, it would appear that the 2252 hex files were already in use.

After reading the Easytherm http://www.vems.hu/wiki/index.php?page=EasyTherm pages, (still a little confusing) i found this line near the bottom of the page

'For the classic 2057 Ohm (@T=+25C) NTC type sensor (often closer to 2063 Ohm in practice though difference is negligable), 2063/263 (or 256 or 268) is best match'

This is what i need!! the sensors read 2050 at 25c. Only problem is that the 2063 hex files do not exist on my computer, i have searched, i have also searched the Wiki, and cant find it anywhere.

Note also on the Easytherm sensor table page http://www.vems.hu/wiki/index.php?page=EasyTherm%2FSensorTable , that there is no link to a list as suggested see this line 'Here are a list of temp calibration files for different cars'

Can some one  help ???

Sprocket:
Scratch that, I found it here http://www.vems.hu/files/Firmware/release/ntc_ptc_hexpatch.zip


I suspect im only interested in the 256 files ???

I'll give it a go shortly ;D

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