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mister-grumbler / w1209-firmware

The functional eqivalent to the original firmware of "Digital Thermostat Module Model XH-W1209".
GNU General Public License v3.0
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Large offset deviation. Showing 7.0°C in 25°C environment. Showing 58.0°C in 100°C environment. #25

Closed rtek1000 closed 1 year ago

rtek1000 commented 1 year ago

Hi,

Large offset deviation.

Showing 7.0°C in 25°C environment.

Showing 58.0°C in 100°C environment.

How can I change the code to make up for this difference?

rtek1000 commented 1 year ago

I found a hardware difference. The fixed resistor is 5.1k (Code 512) Ohms instead of 20k Ohms (R2).

image

rtek1000 commented 1 year ago

I set up a table generator, in case anyone wants to try it out:

Image1

https://github.com/rtek1000/NTC_Lookup_Table_Generator