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Any general discussion around the firmware, what is does, how it does it etc.
By dazq
#51217
rixtronix wrote:
Fri Jun 18, 2021 10:54 pm
pazi88 wrote:
Fri Jun 18, 2021 11:23 am
Or the IAT/CLT calibration values don't match the trim pot values.
How to calibrate it ?

Trimpot pin 1 = 5V ,2 = A0 , 3=GND
Iat and clt are NOT a 0-5v voltage input. They are a simple resistance connected to ground, the bias resistor provides the other half of the divider circuit.
You should search on here for the threads on simulators to get a better idea how to simulate the inputs.
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By rixtronix
#51223
dazq wrote:
Sat Jun 19, 2021 9:47 pm
rixtronix wrote:
Fri Jun 18, 2021 10:54 pm
pazi88 wrote:
Fri Jun 18, 2021 11:23 am
Or the IAT/CLT calibration values don't match the trim pot values.
How to calibrate it ?

Trimpot pin 1 = 5V ,2 = A0 , 3=GND
Iat and clt are NOT a 0-5v voltage input. They are a simple resistance connected to ground, the bias resistor provides the other half of the divider circuit.
You should search on here for the threads on simulators to get a better idea how to simulate the inputs.
This is what I can see about IAT, it's exactly the same I'm making with trimpot
https://pasteboard.co/K7sKRiZ.jpg

?
By dazq
#51225
rixtronix wrote:
Sun Jun 20, 2021 9:43 am
dazq wrote:
Sat Jun 19, 2021 9:47 pm
rixtronix wrote:
Fri Jun 18, 2021 10:54 pm

How to calibrate it ?

Trimpot pin 1 = 5V ,2 = A0 , 3=GND
Iat and clt are NOT a 0-5v voltage input. They are a simple resistance connected to ground, the bias resistor provides the other half of the divider circuit.
You should search on here for the threads on simulators to get a better idea how to simulate the inputs.
This is what I can see about IAT, it's exactly the same I'm making with trimpot
https://pasteboard.co/K7sKRiZ.jpg

?
No it is not the same as what you are proposing!

As I said the iat and clt sensors are a simple resistance between the input pin and ground.
As I also said and can be seen in that image is the other resistance on the other half of the divider circuit that goes to +ve is in the ECU ( the bias resistance).

Please as I suggested, search on this forum , there have been a few threads discussing the design of simulator boards. This will help you understand how the inputs will work far better .
By moonie223
#51227
Image

R1 is the bias resistor.

Image

Above is also a voltage divider circuit. In this case the bias resistor changes with the 'thermistor' resistance, not what you want.

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