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Topic: NEED Help with ISP, Mega 2560 to mini pro (Read 2 times) previous topic - next topic


Do I need a sketch uploaded on the Mega 2560 to use it as a ISP?

Coding Badly


Try a 1uf capacitor between reset and ground on the Mega. This was the only way I could get the Mega to not auto-reset on a serial connection and successfully program another board.

EDIT: Make sure you program the Mega with the ArduinoISP sketch before adding the capacitor.


So I downloaded the sketch from http://code.google.com/p/mega-isp/

Changed the heartbeat delay from 40 to 20, still got the same response, tried to add the cap on the mega 2560 between Ground and reset... tried 0.1 uf and 10uf per another forums suggestion. I am still having the same issue.

I've tried changing the baud rate in the ArduinoISP sketch to 19200 per instructable blog

I get a message about expected signature.

I have tried this on two different Mega's 2560 and 3 different Pro Mini's
I have change/verified the wiring to match that of the ArduinoISP sketch.

I really do appreciate the help. I am tempted to give this a break for a while.


Thinking of getting a FTDI USB controller instead. is this any easier to use to program the Mini Pro.
I found one on eBay for 10.99 http://www.ebay.com/itm/FTDI-USB-Controller-5V-3-3V-Firmware-Loader-and-Programmer-Arduino-FREE-SHIPPING-/320969539027?

Please let me know if this is an easier route.

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