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Johnny Hsu 2025-03-27 16:46:25 +01:00
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temperature-measurement-error/temperature-measurement-error.pdf
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temperature-measurement-error/temperature-measurement-error.tex
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@ -48,7 +48,7 @@ The output voltage is then passed through an RC filter before being fed to an AD
To estimate the error, we calculate the highest possible measured voltage at \SI{60}{\celsius}. To estimate the error, we calculate the highest possible measured voltage at \SI{60}{\celsius}.
According to the design of the voltage divider, the lower the temperature, the higher the output voltage. According to the design of the voltage divider, the lower the temperature, the higher the output voltage.
As shown in Fig. \ref{fig:vref2}, the supply voltage VREF2 for the voltage divider can reach a maximum value of \SI{3.006}\volt. As shown in Fig. \ref{fig:vref2}, the supply voltage $V_{REF2}$ for the voltage divider can reach a maximum value of \SI{3.006}\volt.
Additionally, the total measurement error of the GPIO is $\pm\SI{0.0028}{\volt}$ (as shown in Fig. \ref{fig:aux}). Additionally, the total measurement error of the GPIO is $\pm\SI{0.0028}{\volt}$ (as shown in Fig. \ref{fig:aux}).
Lastly, the maximum resistance of the NTC at \SI{60}{\celsius}, according to the LUT (Tab. \ref{tab:lut}), is \SI{3086.8}{\ohm}. Lastly, the maximum resistance of the NTC at \SI{60}{\celsius}, according to the LUT (Tab. \ref{tab:lut}), is \SI{3086.8}{\ohm}.
The maximum possible voltage measurement can then be calculated as such: The maximum possible voltage measurement can then be calculated as such: