atmega328p arduino to breadboard

Hey guys,

So I uploaded the example Blink onto my arduino 2009. I tested out with a leds and it worked! Then I took out the atmega328p and put in on a breadboard and powered with a 3VDC to pin 7 and 8 ground on the atmega328p. Then I connected the anode of the leds to PB5 and the cathode to ground and it doesn’t work.
How come?

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Cool but my question is why doesn't it work when I took the atmega328 from my arduino with the source code Blink in it. Why doesn't the led flash with only the atmega328 and 3VDC?

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I thought the atmega has a internal crystal

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Then I connected the anode of the leds to PB5 and the cathode to ground and it doesn’t work.

You have to also include a current limiting resistor or you will damage the processor and/or LED.

Then I took out the atmega328p and put in on a breadboard and powered with a 3VDC to pin 7 and 8 ground on the atmega328p

You must provide 4.2V or higher or change the fuse settings.

I thought the atmega has a internal crystal oscillator

It does. But YOU have to reconfigure the processor to use the internal oscillator by changing the fuses. In addition, your Sketch has to be rebuilt for an 8 MHz (or 1 MHz) processor.

That's why it doesn't work. Thanks guys!