In order to Interface the R/C Servo to the AVR Project board, three wires are used to connect the Servo to the Board. Two of the wire can be connected to the any VCC and GND signal. The control wire is connected to the PORTD PIN5 (OC1A/PD5). The Timer1 of the ATMEGA16 can produce a PWM output on this pin. Two Switches are also connected to the PC0 and PC1 to make it rotate Clockwise and Counter Clockwise.




Code for the project is as below, Also the complete project in zip form

#include "avr/io.h"
#define BitVal(x) (1 << (x))

void main (void)
{
    DDRD = BitVal(5);    //Program PORTD5 pin as output
    PORTC = 0x03;    //Enable pullups for Switch detection
    TCCR0 = BitVal(CS01);    //Start Timer 0
    ICR1 = 0xFFFF; //Set Max limit for the Timer, ~16ms period on 4MHz
    TCCR1A = BitVal(WGM11) | BitVal(COM1A1); //Fast PWM, Wave Form output
    TCCR1B = BitVal(CS10) | BitVal(WGM13) | BitVal(WGM12);
    OCR1A = 6000; //1.5mS

    while(1){
        if(TCNT0 > 200){ // Process the key press with a delay
            TCNT0 = 0;
            if(((PINC & BitVal(0)) == 0) && (OCR1A > 1100))
                OCR1A --;   //turn clockwise
            if(((PINC & BitVal(1)) == 0) && (OCR1A < 10000))
                OCR1A ++;  // turn counter clockwise
        }
    }
}