02/23/10 - Oil temp sensor calibration
Though it's probably not
the most accurate sensor in the world, I plan on using my 1 wire OEM
oil temp sensor to display on my DASH2. Since I have a
consistent, regulated 5v supply to the sensor, I should be able to get
fairly accurate results... I may change to a regulated 12v
supply at some point, though.
Inputting the sensor data into the dash 2 is pretty simple. You just enter a voltage
(a function of resistance defined as
V = Vo*R/(R+P)
Vo = supply voltage
R = Sensor resistance
P = Pull up resistor value)
temperature into a table, enter as many data points as you'd like and
it interpolates the rest (third order).
So I attached wires to the sensor:
Then stuck it in a digitally controlled oven. I extended the wires out the door so I never had to open it, and simply took a resistance at various temperatures, allowing sufficient time to normalize.
Pics of this:
And this is the data that I generated:
I also installed the intake manifold and waterpipe back on last night. I used loctite 51531 in conjunction with the metal greddy gasket, and Nissan OEM sealant on the waterpipe. There was actually a defect in the casting of the waterpipe that caused the faces to not match perfectly, so I block sanded the faces, dry fit them and used a feeler gauge to check for gaps. Everything was very tight and close, so FINGERS CROSSED for no leaks!!!!!