2011.10.24 - Gauge Cluster Experiment Project, Pt. 3
- Tested modified linear water temp gauge
- Took resistance vs. temperature readings to compile a new sensor calibration curve
- Removed gauge from cluster
- Changed resistor values on gauge
- Bench tested according to new calibration curve
- Reassembled gauge cluster
Today (yesterday, technically) did not go at all as planned. I ran into some issues where the scale of my thermistor/sensor is slightly different than the scale published by Wallyman. Additionally, there seemed to be some oddity with the chosen resistance values beyond the deviation in sensor calibrations. I spent most of the day comparing resistance values to temperature readings and most of the evening crunching numbers in an attempt to sort it all out. Ultimately I managed to get myself so confused that I just resorted to good old fashioned trial-and-error. Eventually I settled on a parallel resistor value of 210 ohms and a series value of 18 ohms to give me a range of approximately 160F-270F. I have not had a chance to test it in the car yet, but the bench tests look promising based on the sensor calibration curve that I compiled this afternoon.
- Took resistance vs. temperature readings to compile a new sensor calibration curve
- Removed gauge from cluster
- Changed resistor values on gauge
- Bench tested according to new calibration curve
- Reassembled gauge cluster
Today (yesterday, technically) did not go at all as planned. I ran into some issues where the scale of my thermistor/sensor is slightly different than the scale published by Wallyman. Additionally, there seemed to be some oddity with the chosen resistance values beyond the deviation in sensor calibrations. I spent most of the day comparing resistance values to temperature readings and most of the evening crunching numbers in an attempt to sort it all out. Ultimately I managed to get myself so confused that I just resorted to good old fashioned trial-and-error. Eventually I settled on a parallel resistor value of 210 ohms and a series value of 18 ohms to give me a range of approximately 160F-270F. I have not had a chance to test it in the car yet, but the bench tests look promising based on the sensor calibration curve that I compiled this afternoon.