Scaling help

Discuss which Sensors work best with these ECUs and share how you are using inputs and outputs
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Tim
Posts: 81
Joined: Tue Sep 13, 2016 9:06 am
ECU Model: S80 Pro

Scaling help

Post by Tim »

Hi,

I have a couple of these sensors for fluid temp: https://www.efi-parts.co.uk/index.php?productID=125

I also have one of these for air temp: https://www.efi-parts.co.uk/index.php?productID=181

I think I understand the calculation to get valid data for my ECU Vout=(R1/R1+R2)*Vin

R1 = Sensor Resistance
R2 = 1000
Vin = 5

I then multiply that number by 1000 to get mv.

But the thing I'm struggling with is temperatures greater and less than those listed in the tables. Is there a further calculation I need for this, or something else I need to do?

Many Thanks

Tim
Rob Stevens
Posts: 1247
Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: Scaling help

Post by Rob Stevens »

With water temp I undertake a practical test by using iced water through to boiling, do a rough graph and estimate the below freezing and above boiling points based on extending the graph
Tim
Posts: 81
Joined: Tue Sep 13, 2016 9:06 am
ECU Model: S80 Pro

Re: Scaling help

Post by Tim »

Thanks. I figured it would come down to taking my own measurements, I'll have a look at thermocouples today and get setup to do this one evening.

I've also emailed Chris to see if he can shed any light, but again qualified the email by suggesting that I'm happy to take readings myself.
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: Scaling help

Post by Alex DTA »

I'll ping over a spreadsheet shortly
Tim
Posts: 81
Joined: Tue Sep 13, 2016 9:06 am
ECU Model: S80 Pro

Re: Scaling help

Post by Tim »

Alex DTA wrote:I'll ping over a spreadsheet shortly
Ah brilliant! Thanks Alex.
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