Hi all
I have a project which is close to completion, which I have ordered and received a pro mini for.
I don't have a USB adapter for it, and will order one if I must, but would rather not if I can program it with my MEGA 2650.
I have searched the forums and google but to no avail, there are plenty of methods for the UNO but as far as I can see none for the MEGA.
Is it possible?
Thanks very much for any help 
On the Mega - connect Reset to Gnd. That disables the 2560 chip.
Now you can use the USB/Serial adapter to talk to other devices.
Connect Mega Tx to promini Tx
Connect Mega Rx to promini Rx
Connect Mega +5 to promini VCC
Connect Mega Gnd to promini Gnd
In the IDE, select File:Preferences and turn on Verbose outputs.
In the IDE, select Tools:Board:promini 5V/16 MHz. (or 3.3V/8MHz if you have that)
Start the verify/download sequence.
When the IDE shows "compiled xxx of 32xxx bytes" press Reset on the promini.
May take a couple of tries to get the timing down.
1 Like
Thanks very much, just tried and worked perfectly.
Thanks again!
Glad to help.
Bit of an old topic, but im on the same problem, though this solution is a little odd.
I'm a little confused about being told to put 5v on the VCC of a pro mini 3.3v. Because I understood this pin is after the minis own onboard 3.3v regulator. Shouldn't it go to RAW instead?