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Topic: Need help, Arduino 3V @ 8 MHz, uploading "out of sync" (Read 61 times) previous topic - next topic

Quest UK


I have made a basic minimum "Arduino pcb" using its internal 8 MHz clock and running at 3V with a 10K pullup on the reset line.

I have tried to program it, by removing the Atmega 328  IC from a "standard" Arduino fully populated board.

Then connecting wires from the  Rx, Tx, 0V and Reset line to my Basic minimum Arduino board.

I then select 'Arduino Pro Mini 3.3V @ 8Mhz' from the pull down menu you in the Arduino IDE.

I then try to program my board but get the message that they 'are out of sync'

I have an "AVR ISP" that does upload correctly at 3V to my minimum Arduino, but then I cannot use the Rx and Tx to see any messages, that I may output from my code. Also I have to find and select the HEX file every time, using the Arduino IDE its much easier, that's why I want to if possible use that method.

My question is, is there a way to program my PCB using the above or is it impossible?





Did you bootload the 328 (or 328p? There is a difference, abeit minor). If you didn't bootload the chip (they do not come bootloaded from the factory), you won't be able to upload over serial, only via an ISP programmer.

Have a look here: http://www.gammon.com.au/forum/?id=11635. I've used this method to upload the 8MHz (lilypad) bootloader before, though in your case you will need to change your fuses to use the internal clock. Or Arduino as ISP.

The following link looks like it may help too (post 18 - note I have not tested it): http://forum.arduino.cc/index.php?topic=308347.15


You forgot the line from Vcc to Vcc :-P

It works better if you supply power ;-)
Tiny841 + 1634 Core: http://drazzy.com/e/tiny841.shtml
ATTiny core for 1.6.x, for tinies in the x4, x5, x61, x7, x8 series) https://github.com/SpenceKonde/ATTinyCore

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