Re: Calibration for analog sensor (voltage, resistance and NTC sensors)
Posted: Tue Dec 06, 2016 1:52 pm
Thanks for the info.
At a minimum, I want to read the following factory sensors:
MAP (for boost, 0-5V, have factory data table)
Coolant temperature (0-5V, have factory data table)
Oil pressure (resistance in ohms to be determined)
As I read the manual, I do not need to read fuel level in order to display fuel economy and distance to empty. My car has an 8K pulse per mile speed sensor and I can connect to fuel injector #1 for the (-) PWM signal needed.
I'm also using an added oil temperature sensor, it is a General Motors part and it has a data table (click for PDF). I will likely add a 0-5V fuel pressure sensor as well.
The factory MAP sensor has the data for pressure:volts from 14.31 PSI down to 24.01 hg.
For the coolant sensor, the car uses two- one for the gauge (resistance) and another for the ECU (voltage). I found the following data for the ECU sensor has data for temperature:volts from 110 degrees (F) up to 220 degrees.
For the oil pressure sender, I can use an air compressor and an ohm meter to get data points, but it should be about
10 PSI: 45-55 Ohms or Open,
90 PSI: 35-40 Ohms.
I'll use Adc 1 for MAP, Adc 2 for coolant, Adc 3 for oil pressure, Adc 4 for oil temperature, and AdcVcc1 for fuel pressure. I can use the 18B20 for ambient outside air temperature and another inside if needed.
Let me know if any of this appears to be erroneous. I appreciate your help with my planning here.
At a minimum, I want to read the following factory sensors:
MAP (for boost, 0-5V, have factory data table)
Coolant temperature (0-5V, have factory data table)
Oil pressure (resistance in ohms to be determined)
As I read the manual, I do not need to read fuel level in order to display fuel economy and distance to empty. My car has an 8K pulse per mile speed sensor and I can connect to fuel injector #1 for the (-) PWM signal needed.
I'm also using an added oil temperature sensor, it is a General Motors part and it has a data table (click for PDF). I will likely add a 0-5V fuel pressure sensor as well.
The factory MAP sensor has the data for pressure:volts from 14.31 PSI down to 24.01 hg.
For the coolant sensor, the car uses two- one for the gauge (resistance) and another for the ECU (voltage). I found the following data for the ECU sensor has data for temperature:volts from 110 degrees (F) up to 220 degrees.
For the oil pressure sender, I can use an air compressor and an ohm meter to get data points, but it should be about
10 PSI: 45-55 Ohms or Open,
90 PSI: 35-40 Ohms.
I'll use Adc 1 for MAP, Adc 2 for coolant, Adc 3 for oil pressure, Adc 4 for oil temperature, and AdcVcc1 for fuel pressure. I can use the 18B20 for ambient outside air temperature and another inside if needed.
Let me know if any of this appears to be erroneous. I appreciate your help with my planning here.