Avr schematic

hi ben like to watch your show on joutube and I am very interested in microcontrollers have easy pic 7 but for testing we are more liked small AVR board that you made on your show I pulled out the scheme with the Arduino so I wonder if I do it right

colecago over 13 years ago

I don't understand what Pin 1 of SV1 is supposed to be. Did you mean for it to be a serial header and want +5V to be connected there?

Also, what is C4 doing? I generally don't put caps on my reset because it makes it hard for the mciro to be programmed as I think it expects a specific pulse on the reset to go into programming mode. That being said, because Pin1 is kind of floating out there it won't do anyharm until you actually have Pin1 connected to something.

Lastly, I'd switch R2 to a 10k for a stronger pull-up on the reset.
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e14 Contributor over 13 years ago in reply to colecago

hello i am a beginner in this field with the microcontroller is provided with easy pick 7 development system and it is easy to test the code but it has not used this so if you have a better solution for the AVR board share it with us to create a working and functional version of will benefit everyone
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colecago over 13 years ago in reply to e14 Contributor

As far as an AVR board goes it's fine, I'd remove C4, put Vcc on pin 1 of SV1, add another capacitor to the AVcc/ARef section (it can be the same size as your other caps), switch R2 to a 10k, find a value for R1 (http://led.linear1.org/1led.wiz), and everything else looks fine. Keep in mind, you will have to program this with an ISP programmer before you can use it as an Arduino, that or buy preprogrammed Atmega8's with the Arduino bootloader on board.
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e14 Contributor over 13 years ago

tnx ok i will see spec to voltage on diode to calculate R1 for the led diode ok i will set value when i decide which type led diode current and voltage
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benheck over 13 years ago in reply to e14 Contributor

Also 100k pullup on Reset is a bit much. 10k is fine.
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e14 Contributor over 13 years ago

tnx to all
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