What is the problem?

This is the circuit ................. i am trying to upload the video........it will be up soon

Again ... I am not an expert in circuit interpretation but I don't see any GND connected to the LEDs...

If your schematic is accurate the complete absence of any decoupling capacitors won't help.

You need at least 10uF + two or three 100nF ceramics close to the processor from VCC to ground.

Unless the LED display has built in current limiting resistors you should put a resistor in each of the segment connections to limit the current.

MK

ok i have uploaded the video on youtube:-

https://www.youtube.com/watch?v=hdxqWKZSfso

please note that upto 20 seconds everything works fine, then the 7 segments start to flicker

ok i have uploaded the video on youtube:-

https://www.youtube.com/watch?v=hdxqWKZSfso

please note that upto 20 seconds everything works fine, then the 7 segments start to flicker

rishi2628

This has echos of this post, where the same circuit worked when the servo was disconnected.

http://www.element14.com/community/thread/42034/l/servo-problem

Despite several people helping, you stopped replying on the 27th, yet this new post suggests the problem wasn't resolved.

I see several problems if this is built as shown.

1.    The ground from R1, R2 is missing....I'm assuming its is a simple error of the schematic, but maybe not.

2.    I see no capacitors across the supply. and especially the digitally noisy 7 seg LED's.

3.    Pin 13 (PD7) is floating, so either the schematic has another error, or that is the way it's been wired.

This battery is driving the microcontroller and 2 pwm servos that will be connected at pins  16 and 17

In nearly every 'HELP' call when servos are included the OP has failed to add a 1000uF capacitor or power the servos separately, and this has been the cause of various issues.

Does it perform Okay with the servos disconnected.?? (Your previous post suggests the answer is YES)

I might help if you include your code, however I do think its is a supply issue.

In future it is always beneficial to those trying to help to include ALL the schematic.

This includes the Regulator, Filtering capacitors, and connections to the device ...7 seg LED's PWM Servos.

Enrico is correct the ground connection is not shown on this schematic.

While the internet is great at passing information, it doesn't work well with crystal balls, and visibility beyond what is supplied ...

Mark

This is the code:-

i have not written the code for the set button and the servos up until now, but it works fine in the simulation

#include <avr/io.h>

#define F_CPU 16000000UL

#include <util/delay.h>

void display(int i)

{PORTD&=0x80;

if(i>9)

i=i%10;

if(i==0)

PORTD|=0x01;

else if(i==1)

PORTD|=0x67;

else if(i==2)

PORTD|=0x12;

else if(i==3)

PORTD|=0x42;

else if(i==4)

PORTD|=0x64;

else if(i==5)

PORTD|=0x48;

else if(i==6)

PORTD|=0x08;

else if(i==7)

PORTD|=0x63;

else if(i==8)

PORTD|=0x00;

else if(i==9)

PORTD|=0x40;

_delay_us(1000);

}

int main(void)

{DDRB=0b001100;

DDRC=0x0F;

DDRD=0x7F;

int th=0,h=0,t=0,o=0;

     while(1)

/*   

  //else if((PIND & 0b10000000) == 0b10000000)

*/ {if((PINB & 0b100000) == 0b100000)

   {th++;

    while((PINB & 0b100000) == 0b100000)

   {}

   }

   else if((PINB & 0b010000) == 0b010000)

   {h++;

    while((PINB & 0b010000) == 0b010000)

   {}

   }

   else if((PINB & 0b000010) == 0b000010)

   {t++;

    while((PINB & 0b000010) == 0b000010)

   {}

   }

   else if((PINB & 0b000001) == 0b000001)

   {o++;

    while((PINB & 0b000001) == 0b000001)

   {}

   }

   else

{  PORTC=0x01;

      display(o);

   PORTC = PORTC << 1;

   display(t);

   PORTC = PORTC << 1;

   display(h);

   PORTC = PORTC << 1;

   display(th);

   PORTC = PORTC << 1;

}

} 

}

Also, you told me that it is a supply problem. Can you suggest be another ic similar to 7805 or any other circuitry that doesn't cause any interference?

RIshi,

mcb1 told that there is a power problem NOT because the 7805 is a crap component but because, with a reasonable difficult we are trying to decode your info and seems that your schematic has issues related to the powering.

Then - I associate to the suggestion - when you need for help, we expect that are you the first to give all the possible information: more than one time we have asked to post the FULL schematics, that means: all that is used to make this stuff working (or not working). This includes also the power schematics. Then, please read the suggestions, if we see a floating signal, no ground where it is expected to be, check in depth the design and try to see if what we are deducting is true. In this case, please correct it, try again and let know us if the changes works, solve the issue etc.

Last, but not least, please when you paste some kind of code, (better if you take a look on the many how to are on Element14 to use the posts, posting correct etc.) use the syntax higlight feature. So we too can read the code and eventually copy it somewhere to see if it works, compile etc.

So, the wrong written code like the one you wrote

{  PORTC=0x01;

      display(o);

   PORTC = PORTC << 1;

   display(t);

   PORTC = PORTC << 1;

   display(h);

   PORTC = PORTC << 1;

   display(th);

   PORTC = PORTC << 1;

}

become perfectly readable, well syntax highlighted and can be easily copied and pasted in any IDE.

{  PORTC=0x01;
      display(o);
   PORTC = PORTC << 1;
   display(t);
   PORTC = PORTC << 1;
   display(h);
   PORTC = PORTC << 1;
   display(th);
   PORTC = PORTC << 1;
}

ok i will provide you with the full schematics tomorrow, its currently 3 am in my country. i am going of to sleep.

G'Night

rishi2628

The syntax highlighting that Enrico is referring to is a little hidden.

It's a shame there isn't a simple icon, but we struggled to get it added, so it's better than nothing.

past you code, then highlight it all and

Select the >> symbol, then Syntax Highlighting, then C++

It does have issues with blank lines, and tries to make it Excel, but I'm sure you'll sort it out.

Mark

rishi2628

The syntax highlighting that Enrico is referring to is a little hidden.

It's a shame there isn't a simple icon, but we struggled to get it added, so it's better than nothing.

past you code, then highlight it all and

Select the >> symbol, then Syntax Highlighting, then C++

It does have issues with blank lines, and tries to make it Excel, but I'm sure you'll sort it out.

Mark