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Topic: DIY Arduino problem (Read 2105 times) previous topic - next topic

CrossRoads

Promini uses external 8 MHz oscillator, not internal.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

pito

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..

Vincent19



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 :D

CrossRoads

Reset pullup needed for most stable operation, see Section 3

You are free to chase noise issue, odd resets, etc. if you so choose.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Vincent19

Yea, so I neeed a pull up resistor :D

Thanks ^^

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