1 | byte n = 0; // Interrupt Bit Count
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2 | volatile byte pos = 0; // Values Position Count
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3 | volatile byte values[5] = {
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4 | 0,0,0,0,0}; // Values to be stored by sensor
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5 | byte cbit = 0; // Current bit read in
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6 |
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7 | boolean irFlag = false; // Flag to indicate IR reading has been made
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8 | boolean ambFlag = false; // Flag to indicate ambient temp reading has been made
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9 |
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10 |
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11 | byte irValues[5] = {
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12 | 0,0,0,0,0}; // Variable to store IR readings
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13 | byte ambValues[5] = {
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14 | 0,0,0,0,0}; // Variable to store Ambient readings
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15 |
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16 | const int len = 5; // Length of values array
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17 | const int clkPin = 3; // Pins
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18 | const int dataPin = 7;
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19 | const int actionPin = 9;
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20 |
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21 | void setup(){
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22 | Serial.begin(9600);
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23 |
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24 | pinMode(clkPin, INPUT); // Initialize pins
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25 | pinMode(dataPin, INPUT);
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26 | pinMode(actionPin, OUTPUT);
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27 | digitalWrite(clkPin, HIGH);
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28 | digitalWrite(dataPin, HIGH);
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29 | digitalWrite(actionPin, HIGH);
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30 | delay(200);
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31 | Serial.println("Type to Start..."); // Wait for input to start
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32 | //while(!Serial.available());
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33 | Serial.println("Starting...");
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34 | Serial.println("IR (C), Ambient (C), Time Since Start (ms)");
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35 |
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36 | attachInterrupt(1,tn9Data,FALLING); // Interrupt
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37 | digitalWrite(actionPin,LOW);
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38 | delay(2000); // Make sensor start sending data
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39 | }
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40 |
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41 | void loop(){
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42 |
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43 |
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44 |
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45 | if(pos == len && values[0] == 0x4C){ // If sensor has sent IR packet...
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46 | for(int i = 0; i < len; i++){ // Store values to irValues
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47 | irValues[i] = values[i];
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48 | }
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49 | irFlag = true; // Indicate IR reading
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50 | pos = 0;
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51 | digitalWrite(actionPin,LOW); // Make sensor start sending data
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52 | }
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53 |
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54 | if(pos == len && values[0] == 0x66){ // If sensor has sent ambient packet...
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55 | for(int i = 0; i < len; i++){ // Store values to ambValues
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56 | ambValues[i] = values[i];
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57 | }
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58 | ambFlag = true; // Indicate Ambient reading
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59 | pos = 0;
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60 | digitalWrite(actionPin,LOW); // Make sensor start sending data
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61 | }
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62 |
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63 | if(pos == len && values[0] == 0x53){ // If sensor has sent junk packet
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64 | pos = 0;
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65 | digitalWrite(actionPin,LOW); // Make sensor start sending data
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66 | }
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67 |
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68 | if(irFlag && ambFlag){ // If successful IR and Ambient reading...
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69 | digitalWrite(actionPin,HIGH); // Make sensor stop sending data. Because Timing is weird, I want to ensure the interrupts do not happen during this section.
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70 | word tempword = 0; // Next 4 lines isolate temperature component of values
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71 | tempword = tempword | irValues[1];
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72 | tempword = tempword << 8;
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73 | tempword = tempword | irValues[2];
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74 | if(tn9Check(irValues)){ // If checksum is valid, print IR temperature
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75 | //Serial.print("IR = ");
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76 | Serial.print(int(tempword)/16.0 - 273.15);
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77 | Serial.print(", ");
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78 | }
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79 | else{ // If checksum isn't valid, print impossible temp
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80 | //Serial.print("IR = ");
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81 | Serial.print("-273.15, ");
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82 | }
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83 |
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84 | tempword = 0; // Isolate temperature component again for ambient
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85 | tempword = tempword | ambValues[1];
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86 | tempword = tempword << 8;
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87 | tempword = tempword | ambValues[2];
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88 | if(tn9Check(ambValues)){ // If checksum is valid, print ambient temperature
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89 | //Serial.print("Amb = ");
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90 | Serial.print(int(tempword)/16.0 - 273.15);
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91 | }
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92 | else{ // If checksum isn't valid, print impossible temp
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93 | //Serial.print("Amb = ");
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94 | Serial.print("-273.15");
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95 | }
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96 | irFlag = false; // Reset flags
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97 | ambFlag = false;
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98 |
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99 | Serial.print(", ");
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100 | Serial.println(millis());
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101 |
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102 | Serial.println(digitalRead(actionPin)); // Print time for logging purposes
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103 | delay(2000); // Simulate other sensors or code
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104 | digitalWrite(actionPin,LOW); // Make sensor start sending data
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105 | }
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106 |
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107 |
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108 | }
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109 |
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110 |
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111 | void tn9Data(){ // Interrupt Function
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112 | cbit = digitalRead(dataPin); // Read bit
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113 | if(pos >= len) pos = 0; // Keep index below 5
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114 | values[pos] = (values[pos] << 1) | cbit; // Store to values
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115 | n++; // Increment bit count
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116 | if(n == 8){ // Increment position count based on bits read in
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117 | pos++;
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118 | n = 0;
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119 | }
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120 | if(pos == len){
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121 | for(int i = 0; i < len; i++){ // Store values to ambValues
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122 | Serial.print(values[i]);
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123 | Serial.print(" ");
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124 | }
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125 |
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126 | Serial.print("\n"); // If complete "packet" sent, stop sensor from sending
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127 | Serial.println(digitalRead(actionPin));
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128 | digitalWrite(actionPin,HIGH); // again until main loop allows it.
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129 | }
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130 | }
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131 |
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132 |
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133 | boolean tn9Check(byte tn9Values[]){ // Checksum calculating function
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134 | int mcheck = (int)tn9Values[0] + (int)tn9Values[1] + (int)tn9Values[2]; // Checksum calculation
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135 | int scheck = (int)tn9Values[3]; // Checksum sent by sensor
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136 | boolean crc = false; // Initialize return value
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137 | if(mcheck > 510) mcheck = mcheck - 512; // Handle sensor byte rollover
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138 | if(mcheck > 255) mcheck = mcheck - 256; // Handle sensor byte rollover
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139 | if(mcheck == scheck) crc = true; // Check checksum
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140 | return(crc); // Return
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141 | }
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