1 | //-----------------------------------------------------------------------------
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2 |
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3 | #include "interpol.h"
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4 | #include "usart.h"
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5 | #include "ad7719_adc.h"
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6 | //#include "typedefs.h"
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7 | //#include "application.h"
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8 | #include "num_conversion.h"
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9 | //-----------------------------------------------------------------------------
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10 | /*
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11 | Temperatur Sensoren von IST nach DIN60751, Kl.B
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12 | Messfehler +/- 0.30+0.005*|t|
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13 |
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14 | R(t) = R0(1 + At + Bt^2 + C(t-100)t^3) t = [-200, 0]°C
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15 | R(t) = R0(1 + At + Bt^2) t = [0, 850]°C
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16 |
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17 | A = 3.9083*10^-3[°C^-1]
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18 | B = -5.775*10^-7[°C^-2]
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19 | C = -4.183*10^-12[°C^-4]
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20 |
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21 | Strom durch R ist konstant 400uA
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22 | Intervallweise lineare Interpolation der Funktion R(t) mit MATLAB polyfit
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23 | adcword = 13107200 * u(temperatur)
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24 | */
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25 | U08 space_STR[] = " |";
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26 | U08 OoR_STR[] = " OoR |";
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27 |
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28 |
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29 |
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30 | float gettemp(void)
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31 | {
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32 |
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33 |
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34 | U8 temprange = 17;
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35 | U32 adcword=0;
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36 | float temp=-3.14; // should be initialized in a proper way, but I dont know how :-)
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37 | const U32 min = 0x404054;
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38 | const U32 max = 0x8CAF50;
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39 | const U32 s = 0x4C6F0; //(max-min)/16 = s(lice)
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40 |
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41 | adcword = read_adc();
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42 |
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43 | if (adcword >= (min + 8*s))
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44 | {
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45 | if (adcword >= (min + 12*s))
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46 | {
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47 | if (adcword >= (min + 14*s))
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48 | {
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49 | if (adcword >= (min + 15*s))
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50 | {
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51 | if (adcword < max)
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52 | {
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53 | temprange = 16;
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54 | }
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55 | }
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56 | else
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57 | {
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58 | temprange = 15;
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59 | }
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60 | }
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61 | else
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62 | {
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63 | if (adcword >= (min + 13*s))
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64 | {
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65 | temprange = 14;
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66 | }
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67 | else
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68 | {
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69 | temprange = 13;
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70 | }
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71 | }
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72 | }
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73 | else
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74 | {
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75 | if (adcword >= (min + 10*s))
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76 | {
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77 | if (adcword >= (min + 11*s))
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78 | {
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79 | temprange = 12;
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80 | }
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81 | else
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82 | {
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83 | temprange = 11;
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84 | }
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85 | }
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86 | else
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87 | {
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88 | if (adcword >= (min + 9*s))
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89 | {
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90 | temprange = 10;
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91 | }
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92 | else
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93 | {
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94 | temprange = 9;
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95 | }
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96 | }
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97 | }
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98 | }
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99 | else
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100 | {
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101 | if (adcword >= (min + 4*s))
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102 | {
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103 | if (adcword >= (min + 6*s))
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104 | {
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105 | if (adcword >= (min + 7*s))
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106 | {
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107 | temprange = 8;
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108 | }
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109 | else
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110 | {
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111 | temprange = 7;
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112 | }
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113 | }
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114 | else
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115 | {
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116 | if (adcword >= (min + 5*s))
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117 | {
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118 | temprange = 6;
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119 | }
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120 | else
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121 | {
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122 | temprange = 5;
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123 | }
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124 | }
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125 | }
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126 | else
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127 | {
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128 | if (adcword >= (min + 2*s))
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129 | {
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130 | if (adcword >= (min + 3*s))
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131 | {
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132 | temprange = 4;
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133 | }
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134 | else
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135 | {
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136 | temprange = 3;
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137 | }
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138 | }
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139 | else
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140 | {
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141 | if (adcword >= (min + s))
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142 | {
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143 | temprange = 2;
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144 | }
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145 | else
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146 | {
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147 | if (adcword > min)
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148 | {
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149 | temprange = 1;
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150 | }
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151 | }
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152 | }
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153 | }
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154 | }
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155 |
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156 |
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157 | switch (temprange)
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158 | {
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159 | case 1:{ // Temp. Range [-50°C , -34.375°C[
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160 | temp = ((float)adcword / 20764.727846 - 252.7721); //20764.727846 - 252.7721
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161 | }
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162 | break;
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163 |
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164 | case 2:{ // Temp. Range [-34.375°C , -18.75°C[
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165 | temp = ((float)adcword / 20658.049789 - 253.8995); //20658.049789 - 253.8995
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166 | }
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167 | break;
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168 |
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169 | case 3:{ // Temp. Range [-18.75°C , -3.125°C[
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170 | temp = ((float)adcword / 20557.997603 - 255.0436); //20557.997603 - 255.0436
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171 | }
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172 | break;
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173 |
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174 | case 4:{ // Temp. Range [-3.125°C , 12.5°C]
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175 | temp = ((float)adcword / 20462.362624 - 256.2209); //20462.362624 - 256.2209
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176 | }
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177 | break;
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178 |
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179 | case 5:{ // Temp. Range [12.5°C , 28.125°C]
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180 | temp = ((float)adcword / 20367.745024 - 257.4692); //20367.745024 - 257.4692
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181 | }
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182 | break;
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183 |
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184 | case 6:{ // Temp. Range [28.125°C , 43.75°C]
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185 | temp = ((float)adcword / 20273.127424 - 258.8021); //20273.127424 - 258.8021
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186 | }
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187 | break;
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188 |
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189 | case 7:{ // Temp. Range [43.75°C , 59.375°C]
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190 | temp = ((float)adcword / 20178.509824 - 260.2208); //20178.509824 - 260.2208
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191 | }
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192 | break;
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193 |
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194 | case 8:{ // Temp. Range [59.375°C , 75°C]
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195 | temp = ((float)adcword / 20083.892224 - 261.7265); //20083.892224 - 261.7265
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196 | }
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197 | break;
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198 |
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199 | case 9:{ // Temp. Range [75°C , 90.625°C]
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200 | temp = ((float)adcword / 19989.274624 - 263.3203); //19989.274624 - 263.3203
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201 | }
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202 | break;
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203 |
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204 | case 10:{ // Temp. Range [90.625°C , 106.25°C]
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205 | temp = ((float)adcword / 19894.657024 - 265.0037); //19894.657024 - 265.0037
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206 | }
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207 | break;
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208 |
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209 | case 11:{ // Temp. Range [106.25°C , 121.875°C]
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210 | temp = ((float)adcword / 19800.039424 - 266.7778); //19800.039424 - 266.7778
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211 | }
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212 | break;
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213 |
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214 | case 12:{ // Temp. Range [121.875°C , 137.5°C]
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215 | temp = ((float)adcword / 19705.421824 - 268.6439); //19705.421824 - 268.6439
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216 | }
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217 | break;
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218 |
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219 | case 13:{ // Temp. Range [137.5°C , 153.125°C]
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220 | temp = ((float)adcword / 19610.804224 - 270.6035); //19610.804224 - 270.6035
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221 | }
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222 | break;
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223 |
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224 | case 14:{ // Temp. Range [153.125°C , 168.75°C]
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225 | temp = ((float)adcword / 19516.186624 - 272.6578); //19516.186624 - 272.6578
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226 | }
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227 | break;
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228 |
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229 | case 15:{ // Temp. Range [168.75°C , 184.375°C]
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230 | temp = ((float)adcword / 19421.569024 - 274.8082); //19421.569024 - 274.8082
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231 | }
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232 | break;
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233 |
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234 | case 16:{ // Temp. Range [184.375°C , 200°C]
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235 | temp = ((float)adcword / 19326.951424 - 277.0562); //19326.951424 - 277.0562
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236 | }
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237 | break;
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238 | default:{ // Temp. Range beyond [-50C , 200C]
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239 | PORTC = (PORTC | 0x04);
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240 | }
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241 | }// end of switch case statement
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242 | return temp;
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243 |
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244 | }
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245 |
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246 | void readandsendpress(void)
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247 | {
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248 | U32 adcword=0;
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249 | float press;
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250 |
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251 | adcword = read_adc();
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252 |
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253 | if ( (adcword > 0x253332) && (adcword < 0xF80000) ) // Press. Range is [0Bar , 250Bar]
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254 | {
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255 | press = ((float)adcword / (62 * 836.658790402)) - 63.0091; // 62 Ohm
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256 | usart_write_float(press,2,5);
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257 | usart_write_flash_str(space_STR);
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258 | }
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259 | else
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260 | {
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261 | usart_write_flash_str(OoR_STR); // Press. is beyond [0Bar , 250Bar]
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262 | PORTC = (PORTC | 0x04);
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263 | }
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264 |
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265 | }
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266 |
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267 |
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268 | /*
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269 | Temperatur Sensoren von IST nach DIN60751, Kl.B
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270 | Messfehler +/- 0.30+0.005*|t|
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271 |
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272 | R(t) = R0(1 + At + Bt^2 + C(t-100)t^3) t = [-200, 0]°C
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273 | R(t) = R0(1 + At + Bt^2) t = [0, 850]°C
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274 |
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275 | A = 3.9083*10^-3[°C^-1]
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276 | B = -5.775*10^-7[°C^-2]
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277 | C = -4.183*10^-12[°C^-4]
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278 |
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279 | Strom durch R ist konstant 400uA
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280 | Messung ist ratiometrisch bezogen auf Referenzwiderstand an ADC Pin5 (REFIN-) und Pin6 (REFIN+)
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281 | Referenzwiderstand ist ca. 6.28kOhm.
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282 | ADC hat internes gain von 2.
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283 |
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284 | */
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285 |
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286 | float getresistance(void)
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287 | {
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288 |
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289 | U32 adcword=0;
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290 | float resistance;
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291 | const float R_REF=6.28; // kilo-ohms
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292 | adcword = read_adc();
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293 | U32 fullscale = 16777215L; //2^24 -1
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294 |
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295 | resistance = ((float)adcword / (float)fullscale) /2.0 * R_REF; // divide through 2.0 because of PGA in ADC.
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296 |
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297 | return resistance; // in kilo-ohms
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298 | }
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299 |
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300 | U32 getadc(void)
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301 | {
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302 | return read_adc();
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303 | }
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