Changes for page Sensor Module
Last modified by Heimir Thordarson on 2026/07/05 12:56
From version 66.2
edited by Heimir Thordarson
on 2026/03/24 14:39
on 2026/03/24 14:39
Change comment:
There is no comment for this version
To version 61.5
edited by Heimir Thordarson
on 2026/02/23 17:45
on 2026/02/23 17:45
Change comment:
There is no comment for this version
Summary
-
Page properties (1 modified, 0 added, 0 removed)
Details
- Page properties
-
- Content
-
... ... @@ -68,47 +68,44 @@ 68 68 69 69 == Microcontroller Pinout == 70 70 71 -The sensor module uses a microcontroller to measure and calculate the values for the analog signals. The microcontroller used in this system is the [[STM32G491RET6>>doc:.https\:www\.st\.comenmicrocontrollers-microprocessorsstm32g491re\.html.WebHome]] 71 +|=(% style="width: 96px;" %)Physical Pin|=(% style="width: 102px;" %)Electrical Pin|=(% style="width: 991px;" %)Description 72 +|(% style="width:96px" %)1|(% style="width:102px" %) |(% style="width:991px" %) 73 +|(% style="width:96px" %)5|(% style="width:102px" %) |(% style="width:991px" %) 74 +|(% style="width:96px" %)7|(% style="width:102px" %) |(% style="width:991px" %) 75 +|(% style="width:96px" %)9|(% style="width:102px" %) |(% style="width:991px" %) 76 +|(% style="width:96px" %)10|(% style="width:102px" %) |(% style="width:991px" %) 77 +|(% style="width:96px" %)11|(% style="width:102px" %) |(% style="width:991px" %) 78 +|(% style="width:96px" %)12|(% style="width:102px" %) |(% style="width:991px" %) 79 +|(% style="width:96px" %)13|(% style="width:102px" %) |(% style="width:991px" %) 80 +|(% style="width:96px" %)14|(% style="width:102px" %) |(% style="width:991px" %) 81 +|(% style="width:96px" %)15|(% style="width:102px" %) |(% style="width:991px" %) 82 +|(% style="width:96px" %)16|(% style="width:102px" %) |(% style="width:991px" %) 83 +|(% style="width:96px" %)17|(% style="width:102px" %) |(% style="width:991px" %) 84 +|(% style="width:96px" %)18|(% style="width:102px" %) |(% style="width:991px" %) 85 +|(% style="width:96px" %)19|(% style="width:102px" %) |(% style="width:991px" %) 86 +|(% style="width:96px" %)20|(% style="width:102px" %) |(% style="width:991px" %) 87 +|(% style="width:96px" %)21|(% style="width:102px" %) |(% style="width:991px" %) 88 +|(% style="width:96px" %)22|(% style="width:102px" %) |(% style="width:991px" %) 89 +|(% style="width:96px" %)23|(% style="width:102px" %) |(% style="width:991px" %) 90 +|(% style="width:96px" %)27|(% style="width:102px" %) |(% style="width:991px" %) 91 +|(% style="width:96px" %)28|(% style="width:102px" %) |(% style="width:991px" %) 92 +|(% style="width:96px" %)29|(% style="width:102px" %) |(% style="width:991px" %) 93 +|(% style="width:96px" %)31|(% style="width:102px" %) |(% style="width:991px" %) 94 +|(% style="width:96px" %)32|(% style="width:102px" %) |(% style="width:991px" %) 95 +|(% style="width:96px" %)34|(% style="width:102px" %) |(% style="width:991px" %) 96 +|(% style="width:96px" %)35|(% style="width:102px" %) |(% style="width:991px" %) 97 +|(% style="width:96px" %)38|(% style="width:102px" %) |(% style="width:991px" %) 98 +|(% style="width:96px" %)45|(% style="width:102px" %) |(% style="width:991px" %) 99 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 100 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 101 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 102 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 103 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 104 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 105 +|(% style="width:96px" %) |(% style="width:102px" %) |(% style="width:991px" %) 72 72 73 -(% style="width:793.6px" %) 74 -|=(% style="width: 96px;" %)Physical Pin|=(% style="width: 102px;" %)Electrical Pin|=(% style="width: 593px;" %)Description 75 -|(% style="width:96px" %)1|(% style="width:102px" %)VBAT|(% style="width:593px" %)Power source from a backup battery if a RTC would be used (Connected to +3V3 in this case) 76 -|(% style="width:96px" %)5|(% style="width:102px" %)OSC_IN|(% style="width:593px" %)Clock input (8MHz oscillator) 77 -|(% style="width:96px" %)7|(% style="width:102px" %)NRST|(% style="width:593px" %)Negative reset which can be connected to a button (Connected to +3V3) 78 -|(% style="width:96px" %)9|(% style="width:102px" %)PC1|(% style="width:593px" %)Analog signal: Cooling pressure sensor number 2 79 -|(% style="width:96px" %)10|(% style="width:102px" %)PC2|(% style="width:593px" %)Analog signal: Cooling temperature sensor number 2 80 -|(% style="width:96px" %)11|(% style="width:102px" %)PC3|(% style="width:593px" %)Analog signal: Cooling pressure sensor number 4 81 -|(% style="width:96px" %)12|(% style="width:102px" %)PA0|(% style="width:593px" %)Analog signal: Cooling temperature sensor number 4 82 -|(% style="width:96px" %)13|(% style="width:102px" %)PA1|(% style="width:593px" %)Analog signal: Oil temperature sensor right 83 -|(% style="width:96px" %)14|(% style="width:102px" %)PA2|(% style="width:593px" %)Analog signal: Air temperature sensor 84 -|(% style="width:96px" %)15|(% style="width:102px" %)VSS|(% style="width:593px" %)Voltage source: Ground 85 -|(% style="width:96px" %)16|(% style="width:102px" %)VDD|(% style="width:593px" %)Voltage source: Power (+3V3) 86 -|(% style="width:96px" %)17|(% style="width:102px" %)PA3|(% style="width:593px" %)Analog signal: Cooling pressure sensor number 1 87 -|(% style="width:96px" %)18|(% style="width:102px" %)PA4|(% style="width:593px" %)Analog signal: Cooling temperature sensor number 1 88 -|(% style="width:96px" %)19|(% style="width:102px" %)PA5|(% style="width:593px" %)Analog signal: Cooling pressure sensor number 3 89 -|(% style="width:96px" %)20|(% style="width:102px" %)PA6|(% style="width:593px" %)Analog signal: Cooling temperature sensor number 3 90 -|(% style="width:96px" %)21|(% style="width:102px" %)PA7|(% style="width:593px" %)Analog signal: Oil temperature sensor left 91 -|(% style="width:96px" %)22|(% style="width:102px" %)PC4|(% style="width:593px" %)Analog signal: Suspension displacement sensor right 92 -|(% style="width:96px" %)23|(% style="width:102px" %)PC5|(% style="width:593px" %)Analog signal: Suspension displacement sensor left 93 -|(% style="width:96px" %)27|(% style="width:102px" %)VSSA|(% style="width:593px" %)Voltage source: Ground 94 -|(% style="width:96px" %)28|(% style="width:102px" %)VREF+|(% style="width:593px" %)Voltage reference (connected to +3V3) 95 -|(% style="width:96px" %)29|(% style="width:102px" %)VDDA|(% style="width:593px" %)Voltage source: Power (+3V3) 96 -|(% style="width:96px" %)31|(% style="width:102px" %)VSS|(% style="width:593px" %)Voltage source: Ground 97 -|(% style="width:96px" %)32|(% style="width:102px" %)VDD|(% style="width:593px" %)Voltage source: Power (+3V3) 98 -|(% style="width:96px" %)34|(% style="width:102px" %)PB12|(% style="width:593px" %)CAN-BUS 2: Rxd 99 -|(% style="width:96px" %)35|(% style="width:102px" %)PB13|(% style="width:593px" %)CAN-BUS 2: Txd 100 -|(% style="width:96px" %)38|(% style="width:102px" %)PC6|(% style="width:593px" %)Signal Output: Blue status LED 101 -|(% style="width:96px" %)45|(% style="width:102px" %)PA11|(% style="width:593px" %)CAN-BUS 2: Rxd 102 -|(% style="width:96px" %)46|(% style="width:102px" %)PA12|(% style="width:593px" %)CAN-BUS 2: Txd 103 -|(% style="width:96px" %)47|(% style="width:102px" %)VSS|(% style="width:593px" %)Voltage source: Ground 104 -|(% style="width:96px" %)48|(% style="width:102px" %)VDD|(% style="width:593px" %)Voltage source: Power (+3V3) 105 -|(% style="width:96px" %)49|(% style="width:102px" %)PA13|(% style="width:593px" %)Programming Pins: SWDIO 106 -|(% style="width:96px" %)50|(% style="width:102px" %)PA14|(% style="width:593px" %)Programming Pins: SWCLK 107 -|(% style="width:96px" %)63|(% style="width:102px" %)VSS|(% style="width:593px" %)Voltage source: Ground 108 -|(% style="width:96px" %)64|(% style="width:102px" %)VDD|(% style="width:593px" %)Voltage source: Power (+3V3) 109 109 110 110 111 - 112 112 == Air Temperature Sensor == 113 113 114 114 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. ... ... @@ -196,9 +196,9 @@ 196 196 197 197 where: 198 198 199 -* {{mathjax}}\(x\){{/mathjax}}= The mechanical placement excluding the dead length (178mm). 196 +* {{mathjax}}\(x\){{/mathjax}} = The mechanical placement excluding the dead length (178mm). 200 200 * {{mathjax}}\(V_s\){{/mathjax}}= The supply voltage of the linear potentiometer, in this case it is 3.3 {{mathjax}}\(V\){{/mathjax}}. 201 -* {{mathjax}}\(V_{out}\){{/mathjax}}= The output voltage of the linear potentiometer. ranging from 0.033{{mathjax}}\(V\){{/mathjax}} to 3.267{{mathjax}}\(V\){{/mathjax}}. 198 +* {{mathjax}}\(V_{out}\){{/mathjax}} = The output voltage of the linear potentiometer. ranging from 0.033{{mathjax}}\(V\){{/mathjax}} to 3.267{{mathjax}}\(V\){{/mathjax}}. 202 202 203 203 === Filtering === 204 204 ... ... @@ -250,32 +250,6 @@ 250 250 251 251 The sensors output latency can be expected to be a lot shorter than the oil temperature sensor as the sensor is just a variable sensor based on placement. The limiting factor for the system which uses this information is the CAN-BUS messages from the inverters which send the information each 6.25 milliseconds. This means that the cut-off frequency cannot be any lower than 160 Hz, which will make the same type of low pass filter from the oil temperature sensor acceptable with a cut-off frequency of 1591 Hz. 252 252 253 -== Cooling System Sensor == 254 - 255 -There will be four cooling system sensor on the AR26 vehicle, and all of the sensors include two measurements each. These two signals are water temperature and pressure. With this the temperature delta over the entire cooling system can be measured, but also the overall water flow. If the equivalent orifice of the motors, inverters and other components are known, the flow can be calculated using the orifice equation. 256 - 257 - 258 -(% style="font-size: 1.5em;" %) 259 -((( 260 -{{mathjax}} 261 -$$ 262 -Q = C_D \cdot A_D \sqrt{\frac{2 \cdot \Delta P}{\rho}} 263 -$$ 264 -{{/mathjax}} 265 -))) 266 - 267 - 268 -where: 269 - 270 -* {{mathjax}}\(Q\){{/mathjax}} = Waterflow through the equivalent orifice 271 -* {{mathjax}}\(C_D \cdot A_D\){{/mathjax}} = practical cross section of the orifice 272 -* {{mathjax}}\(\Delta P\){{/mathjax}} = Pressure difference between the two pressure sensors 273 -* {{mathjax}}\(\rho\){{/mathjax}} = Density of the cooling liquid 274 - 275 -The sensor used on the AR26 car is the [[Bosch Motorsport PST-F 1>>https://www.bosch-motorsport.de/content/downloads/Raceparts/Resources/pdf/Data%20Sheet_70496907_Pressure_Sensor_Combined_PST-F_1.pdf]] and has the following 276 - 277 - 278 - 279 279 = Bill of Materials = 280 280 281 281 == Circuit Board ==