/*
PWM Clock: Simple clock for analog synth modules.
One potentiometer controls the speed (Freq) and the other controls the sustain/length of the pulse (PWM).
Pulse:
5v _____________ _____________
| | | | |
| | | | |
| | | | |
|_____|_____________|_____|_____________|__
0 1 2 3 4
Note: The freq knob must be wired in reverse:
5+ - pin1
A0 - pin2 (W)
0+ - pin3
*/
const int led = 13;
const int freqPin = 0; // 10k revese log potentiometer
const int pwmPin = 1; // 10k log potentiometer
const int tempoMin = 30; // The minimum tempo 30bpm = 2se
enum {sample_state,high_state,low_state}; //Enumerate(give values to) the variables so they are 0,1,2 respectivly
unsigned int state = sample_state;
unsigned int val1,val2,val3,hiVal,loVal;
float timer;
double mVal = 0;
double bpm = 30;
/*----------------------------------------Main loop--------------------------------------*/
void setup() {
Serial.begin(9600);
pinMode(13,OUTPUT);
}
void loop() {
switch(state){ //There are 3 different states that take place, take sample from inputs, set high duration, set low duration
case sample_state:
val1 = analogRead(pwmPin);
val2 = 1023 -analogRead(pwmPin);
val3 = analogRead(freqPin);
mVal = map(val3,0,1023,60,2000); //Mapped from 60-2000millisec
hiVal = map(val1,0,1023,0,mVal);
loVal = map(val2,0,1023,0,mVal) +1;
bpm = (2000 / mVal) * tempoMin; // tempoMin = 30
Serial.print(bpm) ;
Serial.print(" :BPM ");
state = high_state; //We have inputs, next we go on to high state mode
digitalWrite(led,HIGH); //Set the pin high as the next state is just a timer
timer=millis(); //Set timer to the time when this code block finishes
break;
case high_state:
if(millis()>=timer+hiVal){ //Sit in this state until the timer threshold reaches the end of the high state
state=low_state; //Move on to low state tmer
digitalWrite(led,LOW); //Set pin low
timer=millis(); //Reset timer
}
break;
case low_state:
if(millis()>=timer+loVal){ //Sit in this state until the timer threashold reaches end of the low state
state=sample_state; //Cycle completed, go back to taking a new sample and repeat cycle
}
break;
default: //This should never happen
Serial.println("state variable not valid");
while(1);
break;
}
}