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Atmega328P-PU (arduino uno) from breadboard to pcb

bobj6

Hello everybody.

 

I been working with an arduino uno for a few years now and i decide to make them standalone.

So i bought some Atmega328P-PU and start putting them on a breadboard with a Crystal and a few capacitors

I have loaded the BLINK example onto my Atmega chip and this works fine, The led blinks with an interval of aproximilly a 1/2 second.

 

Now this works i have solderd one onto a PCB.

I used a Voltage regulator (L7805ABV) to make 5 volts out of 12 volts.

the Atmega does get power and ground and the Crystal is also correct installed.

But when i start it up the led on pin 13 doesn't light up.

When I touch the plastic of the Atmega chip the led does ligt up, But flashes way to fast (Not the 1/2 a second it should).

 

does anyone have an idea what is going wrong here?

I thank you in advance.

 

Yours sincerly,

Bob

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  • 0 in reply to bobj6

    Bob

    I'm not sure you've answered Samuel's query

    image

    Perhaps it might be useful if you attach the schematic.

    It can be an image of the diagram you have on paper if you like, but please make sure its clear.

     

    You also haven't told us what capacitors you've added for filtering.

    The 7805 is not enough on its own, you will need a 100-470uF and a 0.1uF capacitor across the 5v line.

     

    There are lots of these made, so it's going to be a small item/connection that has been overlooked.

    Mark