knob.ino

#include <TM1637Display.h>

#if defined(__AVR_ATtiny85__)
#include <Adafruit_SoftServo.h>
#define Servo Adafruit_SoftServo

#define SERVO_PIN PB0
#define POT_PIN PB1
#define DISPLAY_CLK PB3
#define DISPLAY_DIO PB4
#else
#include <Servo.h>
#define LED_PIN 3
#define SERVO_PIN 9
#define POT_PIN 0
#define DISPLAY_CLK 4
#define DISPLAY_DIO 3
#endif
//
Servo myservo;  // create servo object to control a servo

int val;    // variable to read the value from the analog pin
int lastVal;

TM1637Display display(DISPLAY_CLK, DISPLAY_DIO);  //set up the 4-Digit Display.

#define ADMUX_VREF	0x21
void setup() {
	// Set up the interrupt that will refresh the servo for us automagically
	OCR0A = 0xAF;            // any number is OK
	TIMSK |= _BV(OCIE0A);    // Turn on the compare interrupt (below!)

	display.setBrightness(0x0a);  //set the diplay to maximum brightness
	myservo.attach(SERVO_PIN);  // attaches the servo on pin 9 to the servo object
	pinMode(POT_PIN, INPUT);
}

void loop() {
	{
		long avg = 0;
		for (int i = 0; i < 100; i++) {
			avg += analogRead(POT_PIN);
		}
		val = avg / 100;

	}
	val = map(val, 0, 1023, 400, 2400);     // scale it to use it with the servo (value between 0 and 180)
	if (val != lastVal) {
		lastVal = val;
	}
	display.showNumberDec(val);// , false, 4, 3);
	myservo.writeMicroseconds(val);                  // sets the servo position according to the scaled value
	delay(5);
}

// We'll take advantage of the built in millis() timer that goes off
// to keep track of time, and refresh the servo every 20 milliseconds
volatile uint8_t counter = 0;
SIGNAL(TIMER0_COMPA_vect) {
	// this gets called every 2 milliseconds
	counter += 2;
	// every 20 milliseconds, refresh the servos!
	if (counter >= 20) {
		counter = 0;
		myservo.refresh();
	}
}