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56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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LED PWM
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Uses 2 pots to control the duty cycle of a Pulse Width Modulation
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<---- pot 0 ----> <---- pot 0 ---->
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<-- pot 1 --> <--- ...
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*/
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#define LED (13)
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#define POT_1 (0)
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#define POT_2 (1)
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#define POT_3 (2)
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#define SPEAKER (11)
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float delay_on;
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float delay_off;
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float delay_div;
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void setup() {
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// initialize the digital pin as an output.
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// Pin 13 has an LED connected on the nano board:
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pinMode(LED, OUTPUT);
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// initialize Pin 11 as audio out
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pinMode(LED, SPEAKER);
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}
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void loop() {
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// We read the value of the pots at the beginning of the loop
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// and store them as integer variables (declared at the top)
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//delay_on = analogRead(POT_1);
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//delay_off = analogRead(POT_2);
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//
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// But in meergranen PCB 1.0, the pots are wired the wrong way
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// So we need to adjust that :)
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delay_on = 1023 - analogRead(POT_1);
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delay_off = 1023 - analogRead(POT_2);
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// We also read pot 3 value that we will use to control a bit
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// the delay to reach audible range
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//delay_div = 1023 - analogRead(POT_3);
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//
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// But meergranen 1.0
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delay_div = analogRead(POT_3);
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// Parameters for the PWM
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digitalWrite(LED, HIGH); // turn the LED on
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digitalWrite(SPEAKER, HIGH); // turn the LED on
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delay(delay_on/delay_div); // wait for delay_on ms
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digitalWrite(LED, LOW); // turn the LED off
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digitalWrite(SPEAKER, LOW); // turn the LED off
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delay(delay_off/delay_div); // wait for delay_off ms
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}
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