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Changes for page Sensor Module

Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 35.5
edited by Heimir Thordarson
on 2026/01/22 14:15
Change comment: There is no comment for this version
To version 36.1
edited by Heimir Thordarson
on 2026/01/26 17:03
Change comment: There is no comment for this version

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... ... @@ -66,7 +66,7 @@
66 66  [[image:circuit with marks.png||height="218" width="520"]]
67 67  
68 68  (% class="wikigeneratedid" %)
69 -As shown in the figure above, the thermistor is put into a voltage divider circuit with a 4k7 ohm resistor to convert the resistance changes of the thermistor to a measurable voltage. To find the temperature of the thermistor based on the voltage measure by the analog-to-digital converter (adc), the resistance of the thermistor needs to be calculated based on the voltage from a voltage divider.
69 +As shown in the figure above, the thermistor is put into a voltage divider circuit with a 4k7 ohm resistor to convert the resistance changes of the thermistor to a measurable voltage. To find the temperature of the thermistor based on the voltage measure by the analog-to-digital converter (ADC), the resistance of the thermistor needs to be calculated based on the voltage from a voltage divider.
70 70  
71 71  (% style="font-size: 1.5em;" %)
72 72  (((
... ... @@ -79,8 +79,20 @@
79 79  
80 80  Where:
81 81  
82 -* {{mathjax}}\(R_f\){{/mathjax}} = the upper resistor in the voltage divider which stays fixed, which in this case is 4.7k {{mathjax}}\(\Omega\){{/mathjax}}
83 -* {{mathjax}}\(V_{out}\){{/mathjax}} =
82 +* {{mathjax}}\(R_f\){{/mathjax}} = The upper resistor in the voltage divider which stays fixed, which in this case is 4.7k {{mathjax}}\(\Omega\){{/mathjax}}
83 +* {{mathjax}}\(V_{out}\){{/mathjax}} = The voltage over the thermistor, and the voltage that the microcontroller will measure.
84 +* {{mathjax}}\(V_{in}\){{/mathjax}} = The supply voltage of the voltage divider, which in this case is a constant 3.3 {{mathjax}}\(V\){{/mathjax}}
85 +* {{mathjax}}\(R_T\){{/mathjax}} = Resistance of the thermistor
84 84  
87 +Knowing this
88 +
89 +(% style="font-size: 1.5em;" %)
90 +(((
91 +{{mathjax}}
92 +$$
93 +T = \frac{1}{\frac{1}{T_0} + \frac{1}{\beta} \ln\left(\frac{R_T}{R_0}\right)}
94 +$$
95 +{{/mathjax}}
96 +)))
85 85  (% class="wikigeneratedid" %)
86 86