[SOLVED] how to control 2 servo motors by atmega32 simultaneously

[esh123456]

I am driving 2 RC servo motors simultaneously in my robot.I am using atmega32 at 14.7456MHZ frequency. there are no errors when i connect one servo to atmega32, but when two servos connected to MCU, the motors rotate erratic. Can anyone give me suggestion?
excuse me if there is any error in my post, my language isn't English.

 

[js]

I think problem is in your power supply.... or maybe some induction on your control lines when one of motor is powered!
Check your power supply first, large enough ELCOs..?!

 

[esh123456]

thanks js.
but what is the ELCOs? also i used a 5volt regulator for my power supply. is there any way to separate the motor power from MCU?

 

[js]

ELCOs are condensators!
https://nl.wikipedia.org/wiki/Elektrolytische_condensator
you must have enough good voltage and maybe RC filter between your MCU and servo power supply...

 

[tpetar]

Its looks like there is not enough power. But posting of circuit and firmware source will help if some troubleshooting is needed.

 

[esh123456]

here is the code that i used, written in codevision:
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Code C - [expand]
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#include <mega32.h>
 
// Standard Input/Output functions
#include <stdio.h>
 
// Declare your global variables here
 
void main(void)
{
// Declare your local variables here
int c1,c2,c3;
 
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTA=0x00;
DDRA=0x00;
 
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTB=0x00;
DDRB=0x00;
 
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In 
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T 
PORTC=0x00;
DDRC=0x00;
 
// Port D initialization
// Func7=Out Func6=In Func5=Out Func4=Out Func3=In Func2=In Func1=In Func0=In 
// State7=0 State6=T State5=0 State4=0 State3=T State2=T State1=T State0=T 
PORTD=0x00;
DDRD=0xB0;
 
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0x00;
 
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: 230.400 kHz
// Mode: Ph. & fr. cor. PWM top=ICR1
// OC1A output: Non-Inv.
// OC1B output: Non-Inv.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0xA0;
TCCR1B=0x13;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x2D;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
 
 
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
 
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
 
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: Off
// USART Mode: Asynchronous
// USART Baud rate: 115200
UCSRA=0x00;
UCSRB=0x10;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x07;
 
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
 
 
 
while (1)
      {
      // Place your code here  
      scanf("%d %d",&c1,&c2); 
      OCR1A=c1;
      OCR1B=c2;      
               
      };
}

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and the circuit is:

 

[tpetar]

My friend you cant drive motors like that, direct from uC pins. Its not healthy for uC. You should use transistors, uln,...

 

[esh123456]

thanks. by using a more voltage than 5 volts, the problem solved.

 

[tpetar]

There is some fine project example with code:
https://extremeelectronics.co.in/av...ontrol-by-using-avr-atmega32-microcontroller/