All the parts for the circuit. 2 yellow LEDs, 2 220 ohm resistors, 4 trimmer type
potentiometers, the breadboard and the Duemilanove.
Also the first attempt at the circuit.
Trying the AnalogInput example code shows my circuit isn’t right. I thought the potentiometers would work like a slide switch, but it turns out one of the outside pins has to go to power, instead of both going to ground. So …
new Fritzing breadboard …
new circuit diagram and …
new circuit.
A little code:
int clickPin = 0; //input pin for the click track pot
int offsetPin = 1; //input pin for the offset pot
int gridPin = 2; //input pin for the grid pot
int gatePin = 3; //input pin for the gate pot
int clickLEDPin = 3; //pin for the click track LED
int beatLEDPin = 2; //pin for the beat LED
int bpm = 0; //bpm set by click track pot
int offset = 0; //set by offset pot
int grid = 0; //set by grid pot
int gate= 0 ; //set by gate pot
//COUNTERS
int gateCounter = 0;
int beatCounter = 0;
//TIMERS
int milliBlink = 10; //how long to keep the LEDs on
int clickTimer = 0; //the last time the click LED blinked
int clickBlink = 0; //the last timer the click LED was turned on
int beatTimer = 0; //the last time the beat LED blinked;
int beatBlink = 0; //the last time the beat LED was turned on
//UTILITY VARIABLES
int rateValues[] = {32, 24, 16, 12, 8, 6, 4, 3, 2, 1};
void setup() {
pinMode(clickLEDPin, OUTPUT);
pinMode(beatLEDPin, OUTPUT);
clickBlink = millis();
clickTimer = millis();
Serial.begin(9600);
}
void loop() {
//collect raw values
bpm = analogRead(clickPin);
offset = analogRead(offsetPin);
grid = analogRead(gridPin);
gate = analogRead(gatePin);
//TRANSFORM VALUES
//bpm
bpm = map(bpm, 0, 1023, 60, 180); //remap pot value to 60-120
bpm = 60000/bpm; //convert it from a rate to a delay in milliseconds
//grid - grid maps to either 1/32, 1/24, 1/16, 1/12, 1/8, 1/6, 1/4, 1/3, 1/2 or 1
grid = rateValues[map(grid, 0, 1023, 0, 9)]; //remap pot value to an array index
//pardon the interruption, we need to calculate gate here - maps the same as grid
gate = rateValues[map(gate, 0, 1023, 0, 9)];
gate = grid/gate;
//now back to grid
grid = (bpm*4)/grid; //convert from rate to delay
//CLICK LED STUFF
//blink the LED
if(millis() - clickBlink < milliBlink) {
digitalWrite(clickLEDPin, HIGH);
} else {
digitalWrite(clickLEDPin, LOW);
}
//blink the led every bpm number of milliseconds, or every 1/4 note
if(millis() - clickTimer > bpm) {
clickBlink = millis();
clickTimer = millis();
beatCounter++;
//reset beat counter and gate counter every measure
if(beatCounter == 4) {
beatCounter = 0;
gateCounter = 0;
}
}
//BEAT LED STUFF
//blink the LED
if(millis() - beatBlink < milliBlink && gateCounter <= gate) {
digitalWrite(beatLEDPin, HIGH);
} else {
digitalWrite(beatLEDPin, LOW);
}
//blink the led every grid number of milliseconds
if(millis() - beatTimer > grid) {
beatBlink = millis();
beatTimer = millis();
gateCounter++;
}
//debugging stuff
Serial.println(gate);
}
Tempo, grid and gate work. Tomorrow will be getting offset to work and figuring out why the LEDs go out of sync sometimes and why the whole thing just stops sometimes.
