1 | // Right now, PWM output only works on the pins with
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2 | // hardware support. These are defined in the appropriate
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3 | // pins_*.c file. For the rest of the pins, we default
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4 | // to digital output.
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5 | void analogWrite(uint8_t pin, int val)
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6 | {
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7 | // We need to make sure the PWM output is enabled for those pins
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8 | // that support it, as we turn it off when digitally reading or
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9 | // writing with them. Also, make sure the pin is in output mode
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10 | // for consistenty with Wiring, which doesn't require a pinMode
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11 | // call for the analog output pins.
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12 | pinMode(pin, OUTPUT);
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13 | if (val == 0)
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14 | {
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15 | digitalWrite(pin, LOW);
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16 | }
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17 | else if (val == 255)
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18 | {
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19 | digitalWrite(pin, HIGH);
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20 | }
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21 | else
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22 | {
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23 | switch(digitalPinToTimer(pin))
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24 | {
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25 | // XXX fix needed for atmega8
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26 | #if defined(TCCR0) && defined(COM00) && !defined(__AVR_ATmega8__)
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27 | case TIMER0A:
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28 | // connect pwm to pin on timer 0
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29 | sbi(TCCR0, COM00);
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30 | OCR0 = val; // set pwm duty
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31 | break;
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32 | #endif
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33 |
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34 | #if defined(TCCR0A) && defined(COM0A1)
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35 | case TIMER0A:
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36 | // connect pwm to pin on timer 0, channel A
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37 | sbi(TCCR0A, COM0A1);
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38 | OCR0A = val; // set pwm duty
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39 | break;
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40 | #endif
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41 |
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42 | #if defined(TCCR0A) && defined(COM0B1)
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43 | case TIMER0B:
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44 | // connect pwm to pin on timer 0, channel B
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45 | sbi(TCCR0A, COM0B1);
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46 | OCR0B = val; // set pwm duty
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47 | break;
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48 | #endif
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49 |
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50 | #if defined(TCCR1A) && defined(COM1A1)
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51 | case TIMER1A:
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52 | // connect pwm to pin on timer 1, channel A
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53 | sbi(TCCR1A, COM1A1);
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54 | OCR1A = val; // set pwm duty
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55 | break;
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56 | #endif
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57 |
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58 | #if defined(TCCR1A) && defined(COM1B1)
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59 | case TIMER1B:
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60 | // connect pwm to pin on timer 1, channel B
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61 | sbi(TCCR1A, COM1B1);
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62 | OCR1B = val; // set pwm duty
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63 | break;
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64 | #endif
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65 |
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66 | #if defined(TCCR1A) && defined(COM1C1)
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67 | case TIMER1C:
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68 | // connect pwm to pin on timer 1, channel B
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69 | sbi(TCCR1A, COM1C1);
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70 | OCR1C = val; // set pwm duty
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71 | break;
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72 | #endif
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73 |
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74 | #if defined(TCCR2) && defined(COM21)
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75 | case TIMER2:
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76 | // connect pwm to pin on timer 2
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77 | sbi(TCCR2, COM21);
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78 | OCR2 = val; // set pwm duty
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79 | break;
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80 | #endif
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81 |
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82 | #if defined(TCCR2A) && defined(COM2A1)
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83 | case TIMER2A:
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84 | // connect pwm to pin on timer 2, channel A
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85 | sbi(TCCR2A, COM2A1);
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86 | OCR2A = val; // set pwm duty
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87 | break;
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88 | #endif
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89 |
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90 | #if defined(TCCR2A) && defined(COM2B1)
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91 | case TIMER2B:
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92 | // connect pwm to pin on timer 2, channel B
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93 | sbi(TCCR2A, COM2B1);
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94 | OCR2B = val; // set pwm duty
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95 | break;
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96 | #endif
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97 |
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98 | #if defined(TCCR3A) && defined(COM3A1)
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99 | case TIMER3A:
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100 | // connect pwm to pin on timer 3, channel A
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101 | sbi(TCCR3A, COM3A1);
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102 | OCR3A = val; // set pwm duty
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103 | break;
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104 | #endif
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105 |
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106 | #if defined(TCCR3A) && defined(COM3B1)
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107 | case TIMER3B:
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108 | // connect pwm to pin on timer 3, channel B
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109 | sbi(TCCR3A, COM3B1);
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110 | OCR3B = val; // set pwm duty
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111 | break;
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112 | #endif
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113 |
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114 | #if defined(TCCR3A) && defined(COM3C1)
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115 | case TIMER3C:
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116 | // connect pwm to pin on timer 3, channel C
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117 | sbi(TCCR3A, COM3C1);
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118 | OCR3C = val; // set pwm duty
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119 | break;
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120 | #endif
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121 |
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122 | #if defined(TCCR4A)
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123 | case TIMER4A:
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124 | //connect pwm to pin on timer 4, channel A
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125 | sbi(TCCR4A, COM4A1);
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126 | #if defined(COM4A0) // only used on 32U4
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127 | cbi(TCCR4A, COM4A0);
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128 | #endif
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129 | OCR4A = val; // set pwm duty
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130 | break;
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131 | #endif
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132 |
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133 | #if defined(TCCR4A) && defined(COM4B1)
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134 | case TIMER4B:
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135 | // connect pwm to pin on timer 4, channel B
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136 | sbi(TCCR4A, COM4B1);
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137 | OCR4B = val; // set pwm duty
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138 | break;
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139 | #endif
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140 |
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141 | #if defined(TCCR4A) && defined(COM4C1)
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142 | case TIMER4C:
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143 | // connect pwm to pin on timer 4, channel C
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144 | sbi(TCCR4A, COM4C1);
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145 | OCR4C = val; // set pwm duty
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146 | break;
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147 | #endif
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148 |
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149 | #if defined(TCCR4C) && defined(COM4D1)
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150 | case TIMER4D:
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151 | // connect pwm to pin on timer 4, channel D
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152 | sbi(TCCR4C, COM4D1);
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153 | #if defined(COM4D0) // only used on 32U4
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154 | cbi(TCCR4C, COM4D0);
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155 | #endif
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156 | OCR4D = val; // set pwm duty
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157 | break;
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158 | #endif
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159 |
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160 |
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161 | #if defined(TCCR5A) && defined(COM5A1)
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162 | case TIMER5A:
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163 | // connect pwm to pin on timer 5, channel A
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164 | sbi(TCCR5A, COM5A1);
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165 | OCR5A = val; // set pwm duty
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166 | break;
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167 | #endif
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168 |
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169 | #if defined(TCCR5A) && defined(COM5B1)
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170 | case TIMER5B:
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171 | // connect pwm to pin on timer 5, channel B
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172 | sbi(TCCR5A, COM5B1);
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173 | OCR5B = val; // set pwm duty
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174 | break;
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175 | #endif
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176 |
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177 | #if defined(TCCR5A) && defined(COM5C1)
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178 | case TIMER5C:
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179 | // connect pwm to pin on timer 5, channel C
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180 | sbi(TCCR5A, COM5C1);
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181 | OCR5C = val; // set pwm duty
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182 | break;
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183 | #endif
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184 |
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185 | case NOT_ON_TIMER:
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186 | default:
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187 | if (val < 128) {
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188 | digitalWrite(pin, LOW);
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189 | } else {
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190 | digitalWrite(pin, HIGH);
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191 | }
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192 | }
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193 | }
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194 | }
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