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arduino basics: PWM signal through LED
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| // PWM signal through pin 3 | |
| // 8 bits PWM: 0 (0% or GND) to 255 (100% or VCC) | |
| // what's a PWM signal? read here: https://en.wikipedia.org/wiki/Pulse-width_modulation | |
| // pin 3 will source current to the LED | |
| // refer to source_current.ino file to see how to connect the LED | |
| // code executed on Arduino Leonardo | |
| void setup(){ | |
| pinMode(3, OUTPUT); // observe that only pins preceded by ~ in the board can output a PWM signal | |
| } | |
| void loop(){ | |
| int i = 0; | |
| // this loop increments the PWM's output value from 0 to 255 | |
| while(i < 256){ | |
| analogWrite(3, i); | |
| delay(1); // delay of 1 ms | |
| i++; | |
| } | |
| // at this point i = 255 | |
| // this loop decrements the PWM's output value from 255 to 0 | |
| while(i > 0){ | |
| analogWrite(3, i); | |
| delay(1); | |
| i--; | |
| } | |
| } |
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