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Changes for page Sensor Module

Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 41.2
edited by Heimir Thordarson
on 2026/01/26 17:42
Change comment: There is no comment for this version
To version 42.4
edited by Heimir Thordarson
on 2026/01/27 14:39
Change comment: There is no comment for this version

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53 53  |(% style="width:71px" %)14|(% style="width:164px" %)CAN High 1|(% style="width:124px" %)CAN|(% style="width:70px" %)29|(% style="width:218px" %)CAN Low 2|(% style="width:58px" %)CAN|(% style="width:32px" %)44|(% style="width:192px" %)Main Power|(% style="width:90px" %)+24V
54 54  |(% style="width:71px" %)15|(% style="width:164px" %)CAN Low 1|(% style="width:124px" %)CAN|(% style="width:70px" %)30|(% style="width:218px" %)CAN High 2|(% style="width:58px" %)CAN|(% style="width:32px" %) |(% style="width:192px" %) |(% style="width:90px" %)
55 55  
56 +== Air Temperature Sensor ==
56 56  
57 -
58 -== Typical Application ==
59 -
60 -This section will cover the sensors which will be used for AR26 and how the sensor module is designed to accommodate them.
61 -
62 -=== Air Temperature Sensor ===
63 -
64 64  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.
65 65  
66 -[[image:circuit with marks.png||height="218" width="520"]]
60 +[[image:circuit with marks.png||height="237" width="566"]]
67 67  
68 68  (% class="wikigeneratedid" %)
69 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.
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102 102  * {{mathjax}}\(R_0\){{/mathjax}} = The resistance of the thermistor when it is 25 degrees celsius.
103 103  * {{mathjax}}\(R_T\){{/mathjax}} = The current resistance of the thermistor.
104 104  
105 -==== Filtering ====
99 +=== Filtering ===
106 106  
107 107  Considering that the sensor can only promise a reaction time of 5 seconds when in water, it can be assumed that a heavy filter will not add any problematic latencies. To ensure a low cost, the filter uses common components which will filter any noise above the inverter switching noise.
108 108  
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117 117  
118 118  Where:
119 119  
120 -* {{mathjax}}\(F_c\){{/mathjax}} = cut-off frequency of the filter. Any noise with a frequency above this will be
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.
117 +
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 +
120 +== Suspension Displacement Sensor ==
121 +
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 +
124 +[[image:Suspension Displacement Circuit.png]]
125 +
126 +
127 +
128 +
Suspension Displacement Circuit.png
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1 +XWiki.117349330247369537212
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