what`s wrong with my .inc file?

[red-racing]

Hi, I have configured my ADC7 to read OILTEMP in °C

The ADC is working correct, but the guage is stuck at 97°C, which also is my max in the inc file.

a test in the bench shows: 2.5v on ADC7 gives ADC=522,(correct) but still 97°C on guage(incorrect). I tried with 18ohm resistor, then I got 38ADC, then the guage shows 133°C. But all ADC above, even 1023 shows 97°C

I have attached the .inc file. please find something wrong with it.
thanks

[LT401Vette]

The entries should go from low volts to high as that is the look up key and it starts looking at the 1st row.

What does your ini entry look like? Are you using a table function that is passed in volts instead of ADC?

[red-racing]

Hi Phil
I have now turned my table, but the guage now dispalys 7c on 522ADC (2.500v)
so something must still be wrong.

I have no custom entry in the .ini file, I used the ass custom channel in TS 2.9

oil_temp.inc

[LT401Vette]

Are you using a table function that is passed in volts instead of ADC?

I'm guessing you are using straight adc7 as the input. That would be doing the lookup based on ADC, meanwhile your inc file is volts. So you would need adc7 to read less than 5 before your oil pressure would ever read anything but the railed out 7...

One way to handle this is to convert your volts to ADC values in your inc file:

Code: Select all

; ; DRE oil/water temp sensor
; Use w. 470 Ohm pullup resistor (VREF)
; Volts	Temp

221.5	97
259.8	90
315.9	80
382	70
463.8	60
542.1	50
628.9	40
717.1	30
778.9	21
875.9	7