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Changes for page Sensor Module

Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 42.4
edited by Heimir Thordarson
on 2026/01/27 14:39
Change comment: There is no comment for this version
To version 42.1
edited by Heimir Thordarson
on 2026/01/26 18:18
Change comment: Uploaded new attachment "Suspension Displacement Circuit.png", version {1}

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57 57  
58 58  The air temperature sensor will be used to have a dynamic reference setpoint for the cooling system. This could reduce the current draw from the low voltage system compared to having a fixed reference point. This is because the regulator will not try to cool the water to a temperature lower than the ambient temperature. The sensor works as a resistor which varies depending on its temperature. Where in this case, the resistance lowers when the temperature increases (NTC). To make the microcontroller able to measure the changes in resistance, the thermistor is put into a voltage divider circuit.
59 59  
60 -[[image:circuit with marks.png||height="237" width="566"]]
60 +[[image:circuit with marks.png||height="218" width="520"]]
61 61  
62 62  (% class="wikigeneratedid" %)
63 63  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.
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112 112  Where:
113 113  
114 114  * {{mathjax}}\(F_c\){{/mathjax}} = Cut-off frequency of the filter. Any noise with a frequency above this will be filtered out.
115 -* {{mathjax}}\(R\){{/mathjax}} = Resistance of the resistor in low-pass filter.
116 -* {{mathjax}}\(C\){{/mathjax}} = Capacitance of the capacitor in the low-pass filter.
115 +* {{mathjax}}\(R\)
116 +{{/mathjax}} = Resistance of the resistor in low-pass filter.
117 +* {{mathjax}}\(C\)
118 +{{/mathjax}} = Capacitance of the capacitor in the low-pass filter.
117 117  
118 118  Using a resistor with 10k {{mathjax}}\(\Omega\){{/mathjax}} and a capacitor with 100 **nF **in capacitance, the cut-off frequency will be 159 **Hz.**
119 119  
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121 121  
122 122  For AR26, the same sensors from AR25 is reused. These are the [[Texense RSL-A-50-P>>https://cdn.shopify.com/s/files/1/0368/1989/files/technical_datasheet_RSL.pdf?413]] which can be connected as the entire voltage divider when using each end as supply and ground. The output of the sensor will then be the throw of the sensor.
123 123  
124 -[[image:Suspension Displacement Circuit.png]]
125 125  
126 -
127 -
128 128