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Author Topic: DIY Arduino problem  (Read 1282 times)
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Promini uses external 8 MHz oscillator, not internal.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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learn how to use fuses:

http://www.engbedded.com/fusecalc/

The 22pF caps on the crystal are important as they help crystal to oscillate on its fundamental frequency..
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So, the minimum circuit for an arduino based development board is a 16MHz crystal and the 100nF cap for power supply and pull up resistor for RESET pin ?

No, you can use the internal oscilator (there is a fuse). And the reset is not required. The minimum is just the cap for the supply

Why reset is not required ? I thought RESET should be pulled up for normal usage ?

Thanks smiley-grin
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Reset pullup needed for most stable operation, see Section 3

You are free to chase noise issue, odd resets, etc. if you so choose.

* AtmelAVR042 AVR Design Considerations.pdf (236.19 KB - downloaded 4 times.)
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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Yea, so I neeed a pull up resistor smiley-grin

Thanks ^^
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