Oil temp sensor...

GROPIUS
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Joined: Mon Feb 18, 2013 9:03 pm
Location: Southend-On-Sea
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Oil temp sensor...

Postby GROPIUS » Wed May 07, 2014 7:57 pm

I've found an oil temp sensor but only have the RESISTANCE with the relevant Celsius...
for example...
20 deg C = 2.115 K ohm..
30 deg C = 1.375
40 deg C = 0.915
50 deg C = 0.621
60 deg C = 0.430
70 deg C = 0.303
80 deg C = 0.218
90 deg C = 0.159
100 deg C = 0.117
110 deg C = 0.088
120 deg C = 0.067
130 deg C = 0.051
140 deg C = 0.040
150 deg C = 0.031

Also...
it does say on the sheet R25 = 1.7 K ohm

Please help...

Support
Posts: 399
Joined: Mon Nov 21, 2005 4:09 pm

Support

Postby Support » Thu May 08, 2014 4:40 pm

Hello,

V = (R1 / (R1+R2)) * V

R1 = Sensor resistance
R2 = Pull up resistor value
V = Supply voltage (Must be regulated (fixed) voltage. All units have 5v reference out

Pull up resistor value need to be similar to the resistance value of the sensor. I recommend in this case 1K. This is because the 2 resistances divide the voltage. So if both resistance is 1k the output would be 2.5v

1/2 = 0.5 * 5 = 2.5v

If you use 10k the voltage change between 20c and 120c will be small and the values will be noisy.

1 side of the pull up resistor needs connecting to 5v and the other to the signal wire.

Kind regards,
Support (K)
______________________________
Posted by Race Technology Support

GROPIUS
Posts: 14
Joined: Mon Feb 18, 2013 9:03 pm
Location: Southend-On-Sea
Contact:

Postby GROPIUS » Sat May 17, 2014 10:01 am

Cheers for that.
Done a spreadsheet to make all thew relevant calculations nicely..
Job done!
Could be easily adapted to work on other sensor values too :wink:


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