This is a circuit to measure the temperature in the vehicle from two temperature sensors.
Dependencies: mbed 4DGL-uLCD-SE
main.cpp@0:94443daebe4c, 2020-12-17 (annotated)
- Committer:
- tadhgjones
- Date:
- Thu Dec 17 14:37:13 2020 +0000
- Revision:
- 0:94443daebe4c
Temperature Detection Circuit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tadhgjones | 0:94443daebe4c | 1 | #include "mbed.h" |
tadhgjones | 0:94443daebe4c | 2 | #include "uLCD_4DGL.h" |
tadhgjones | 0:94443daebe4c | 3 | |
tadhgjones | 0:94443daebe4c | 4 | |
tadhgjones | 0:94443daebe4c | 5 | // Analog input (pin 15) |
tadhgjones | 0:94443daebe4c | 6 | AnalogIn ain(p15); |
tadhgjones | 0:94443daebe4c | 7 | AnalogIn ain2(p16); |
tadhgjones | 0:94443daebe4c | 8 | |
tadhgjones | 0:94443daebe4c | 9 | // USB serial (tx, rx) |
tadhgjones | 0:94443daebe4c | 10 | Serial pc(USBTX, USBRX); |
tadhgjones | 0:94443daebe4c | 11 | |
tadhgjones | 0:94443daebe4c | 12 | // TX, RX, and RES pins |
tadhgjones | 0:94443daebe4c | 13 | uLCD_4DGL uLCD(p9,p10,p11); |
tadhgjones | 0:94443daebe4c | 14 | |
tadhgjones | 0:94443daebe4c | 15 | void Temperature(); |
tadhgjones | 0:94443daebe4c | 16 | void TempConstraints(); |
tadhgjones | 0:94443daebe4c | 17 | float getTemp(); |
tadhgjones | 0:94443daebe4c | 18 | float avgTemp(); |
tadhgjones | 0:94443daebe4c | 19 | float getTemp2(); |
tadhgjones | 0:94443daebe4c | 20 | float avgTemp2(); |
tadhgjones | 0:94443daebe4c | 21 | |
tadhgjones | 0:94443daebe4c | 22 | float voltage_in; |
tadhgjones | 0:94443daebe4c | 23 | float degrees_c; |
tadhgjones | 0:94443daebe4c | 24 | float avgT; |
tadhgjones | 0:94443daebe4c | 25 | float Temp; |
tadhgjones | 0:94443daebe4c | 26 | float a; |
tadhgjones | 0:94443daebe4c | 27 | float b; |
tadhgjones | 0:94443daebe4c | 28 | |
tadhgjones | 0:94443daebe4c | 29 | int main() { |
tadhgjones | 0:94443daebe4c | 30 | |
tadhgjones | 0:94443daebe4c | 31 | |
tadhgjones | 0:94443daebe4c | 32 | // Collect temperatures with timestamps every second |
tadhgjones | 0:94443daebe4c | 33 | while(1) { |
tadhgjones | 0:94443daebe4c | 34 | uLCD.cls(); |
tadhgjones | 0:94443daebe4c | 35 | uLCD.printf("Temperature:\n\n"); |
tadhgjones | 0:94443daebe4c | 36 | |
tadhgjones | 0:94443daebe4c | 37 | Temperature(); |
tadhgjones | 0:94443daebe4c | 38 | wait(10); |
tadhgjones | 0:94443daebe4c | 39 | } |
tadhgjones | 0:94443daebe4c | 40 | } |
tadhgjones | 0:94443daebe4c | 41 | |
tadhgjones | 0:94443daebe4c | 42 | void Temperature(){ |
tadhgjones | 0:94443daebe4c | 43 | |
tadhgjones | 0:94443daebe4c | 44 | a = avgTemp(); |
tadhgjones | 0:94443daebe4c | 45 | b = avgTemp2(); |
tadhgjones | 0:94443daebe4c | 46 | |
tadhgjones | 0:94443daebe4c | 47 | TempConstraints(); |
tadhgjones | 0:94443daebe4c | 48 | |
tadhgjones | 0:94443daebe4c | 49 | uLCD.text_width(2); |
tadhgjones | 0:94443daebe4c | 50 | uLCD.text_height(2); |
tadhgjones | 0:94443daebe4c | 51 | Temp = (a + b)/2; |
tadhgjones | 0:94443daebe4c | 52 | pc.printf("%3.1f deg C\n\r", Temp); |
tadhgjones | 0:94443daebe4c | 53 | uLCD.printf("%3.1f \t", Temp); |
tadhgjones | 0:94443daebe4c | 54 | uLCD.text_width(1); |
tadhgjones | 0:94443daebe4c | 55 | uLCD.text_height(1); |
tadhgjones | 0:94443daebe4c | 56 | uLCD.printf("o"); |
tadhgjones | 0:94443daebe4c | 57 | uLCD.text_width(2); |
tadhgjones | 0:94443daebe4c | 58 | uLCD.text_height(2); |
tadhgjones | 0:94443daebe4c | 59 | uLCD.printf("C"); |
tadhgjones | 0:94443daebe4c | 60 | } |
tadhgjones | 0:94443daebe4c | 61 | |
tadhgjones | 0:94443daebe4c | 62 | void TempConstraints() { |
tadhgjones | 0:94443daebe4c | 63 | |
tadhgjones | 0:94443daebe4c | 64 | if(degrees_c <= 4){ |
tadhgjones | 0:94443daebe4c | 65 | pc.printf("WARNING\nCOLD TEMPERATURES\nICE MAY BE PRESENT"); |
tadhgjones | 0:94443daebe4c | 66 | } |
tadhgjones | 0:94443daebe4c | 67 | if(abs(a-b) > 4){ |
tadhgjones | 0:94443daebe4c | 68 | uLCD.printf("WARNING\nTEMPERATURE SENSOR\nFAULT\n"); |
tadhgjones | 0:94443daebe4c | 69 | } |
tadhgjones | 0:94443daebe4c | 70 | } |
tadhgjones | 0:94443daebe4c | 71 | |
tadhgjones | 0:94443daebe4c | 72 | float getTemp(){ |
tadhgjones | 0:94443daebe4c | 73 | voltage_in = ain * 3.3; |
tadhgjones | 0:94443daebe4c | 74 | degrees_c = ((voltage_in - 0.5) * 100.0); |
tadhgjones | 0:94443daebe4c | 75 | return degrees_c; |
tadhgjones | 0:94443daebe4c | 76 | } |
tadhgjones | 0:94443daebe4c | 77 | |
tadhgjones | 0:94443daebe4c | 78 | float getTemp2(){ |
tadhgjones | 0:94443daebe4c | 79 | voltage_in = ain2 * 3.3; |
tadhgjones | 0:94443daebe4c | 80 | degrees_c = ((voltage_in - 0.5) * 100.0); |
tadhgjones | 0:94443daebe4c | 81 | return degrees_c; |
tadhgjones | 0:94443daebe4c | 82 | } |
tadhgjones | 0:94443daebe4c | 83 | |
tadhgjones | 0:94443daebe4c | 84 | //Thsi function obtaines the voltage from the first sensor |
tadhgjones | 0:94443daebe4c | 85 | float avgTemp(){ |
tadhgjones | 0:94443daebe4c | 86 | float a = getTemp(); |
tadhgjones | 0:94443daebe4c | 87 | float b = getTemp(); |
tadhgjones | 0:94443daebe4c | 88 | float c = getTemp(); |
tadhgjones | 0:94443daebe4c | 89 | float d = getTemp(); |
tadhgjones | 0:94443daebe4c | 90 | float e = getTemp(); |
tadhgjones | 0:94443daebe4c | 91 | float f = getTemp(); |
tadhgjones | 0:94443daebe4c | 92 | float g = getTemp(); |
tadhgjones | 0:94443daebe4c | 93 | float h = getTemp(); |
tadhgjones | 0:94443daebe4c | 94 | float i = getTemp(); |
tadhgjones | 0:94443daebe4c | 95 | float j = getTemp(); |
tadhgjones | 0:94443daebe4c | 96 | float k = getTemp(); |
tadhgjones | 0:94443daebe4c | 97 | float l = getTemp(); |
tadhgjones | 0:94443daebe4c | 98 | float m = getTemp(); |
tadhgjones | 0:94443daebe4c | 99 | float n = getTemp(); |
tadhgjones | 0:94443daebe4c | 100 | float o = getTemp(); |
tadhgjones | 0:94443daebe4c | 101 | float p = getTemp(); |
tadhgjones | 0:94443daebe4c | 102 | float q = getTemp(); |
tadhgjones | 0:94443daebe4c | 103 | float r = getTemp(); |
tadhgjones | 0:94443daebe4c | 104 | float s = getTemp(); |
tadhgjones | 0:94443daebe4c | 105 | float t = getTemp(); |
tadhgjones | 0:94443daebe4c | 106 | |
tadhgjones | 0:94443daebe4c | 107 | //The function is called to get 20 Values of the required voltage in order |
tadhgjones | 0:94443daebe4c | 108 | //to acieve an accurate resuilt and eliminate outlier effects |
tadhgjones | 0:94443daebe4c | 109 | avgT = (a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q+r+s+t)/20; |
tadhgjones | 0:94443daebe4c | 110 | |
tadhgjones | 0:94443daebe4c | 111 | return avgT; |
tadhgjones | 0:94443daebe4c | 112 | } |
tadhgjones | 0:94443daebe4c | 113 | |
tadhgjones | 0:94443daebe4c | 114 | //this function obtaines the voltage from the second sensor |
tadhgjones | 0:94443daebe4c | 115 | float avgTemp2(){ |
tadhgjones | 0:94443daebe4c | 116 | float a = getTemp2(); |
tadhgjones | 0:94443daebe4c | 117 | float b = getTemp2(); |
tadhgjones | 0:94443daebe4c | 118 | float c = getTemp2(); |
tadhgjones | 0:94443daebe4c | 119 | float d = getTemp2(); |
tadhgjones | 0:94443daebe4c | 120 | float e = getTemp2(); |
tadhgjones | 0:94443daebe4c | 121 | float f = getTemp2(); |
tadhgjones | 0:94443daebe4c | 122 | float g = getTemp2(); |
tadhgjones | 0:94443daebe4c | 123 | float h = getTemp2(); |
tadhgjones | 0:94443daebe4c | 124 | float i = getTemp2(); |
tadhgjones | 0:94443daebe4c | 125 | float j = getTemp2(); |
tadhgjones | 0:94443daebe4c | 126 | float k = getTemp2(); |
tadhgjones | 0:94443daebe4c | 127 | float l = getTemp2(); |
tadhgjones | 0:94443daebe4c | 128 | float m = getTemp2(); |
tadhgjones | 0:94443daebe4c | 129 | float n = getTemp2(); |
tadhgjones | 0:94443daebe4c | 130 | float o = getTemp2(); |
tadhgjones | 0:94443daebe4c | 131 | float p = getTemp2(); |
tadhgjones | 0:94443daebe4c | 132 | float q = getTemp2(); |
tadhgjones | 0:94443daebe4c | 133 | float r = getTemp2(); |
tadhgjones | 0:94443daebe4c | 134 | float s = getTemp2(); |
tadhgjones | 0:94443daebe4c | 135 | float t = getTemp2(); |
tadhgjones | 0:94443daebe4c | 136 | |
tadhgjones | 0:94443daebe4c | 137 | avgT = (a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q+r+s+t)/20; |
tadhgjones | 0:94443daebe4c | 138 | |
tadhgjones | 0:94443daebe4c | 139 | return avgT; |
tadhgjones | 0:94443daebe4c | 140 | } |
tadhgjones | 0:94443daebe4c | 141 | |
tadhgjones | 0:94443daebe4c | 142 | |
tadhgjones | 0:94443daebe4c | 143 |