Program an Arduino with another Arduino

Do simulation first by Protus8.

Use SPI software.

Here is a way How to program a AVR (arduino) with another arduino

clem57 That link is for programming the bootloader into a blank 328 chip.

If I read the OP right, he wants to use an Arduino to replace the program contents.

I'm sure there is a method of poking data onto the ram parts of an Arduino, but it's certainly beyond me.

One thing I can offer is that the EEPROM doesn't have enough room to store that amount of data.

rishi2628 is more than capable of using Google ....  just as I would ....

Mark

Something more like uProg perhaps ?

https://www.youtube.com/watch?v=tg67HWwBRlY

µProg – tiny, fast, portable AVR programmer with SD – mdiy.pl

Another interesting looking project is Phoenard which appears to be able to store and then recall multiple Arduino sketches without the laptop/IDE.

https://www.youtube.com/watch?v=bAFTAbY9mdk

Clem you are right! By a certain point of view it is the way to program the bootloader and I have already done this in past in a lot of cases. I have used a UNO instead of a Mega but there are just the pins connection differences.

This is also the way - not yet personally tested - to program directly a chip without the bootloader. I read something about in past but I was no longer able to find the link. Is a lack of my memory or this is a reasonable option?

Enrico

How to program using SPI like interface is all in the UserGuide for the chip

http://www.atmel.com/images/Atmel-8271-8-bit-AVR-Microcontroller-ATmega48A-48PA-88A-88PA-168A-168PA-328-328P_datasheet_C…

1. Write the sketch or modify existing one such that when powered on a d perhaps a button is pressed, it will try to start programming an attached ATMEGA328 (Using its pins 10, 11,12,13)

now every time the programmer is powered on, it will wait for a button press and then execute the programed sequence to transfer the desired program to the target.

You will have to program the target code as a binary file separately, convert it into a byte array in your code and on command, transfer this to the flash memory of the target ATMEGA.

Obviously you will never be able to have a program as big as its flash as the source is stored in FLASH along with the code to program another. You could use an ATMEGA2560 to overcome this limitation

Actually I was looking for a solution something like this :-

https://www.youtube.com/watch?v=M-sFQNIXde8

Only supports one master and one slave at a time though, and also pretty much does what I described previously but using the serial port for programming

zThe video that flows onto is slightly better though but is still limited to one slave and one master.

Now if you can take the master to a site, im sure you could take a laptop instead.

Typically you dont need the exact image on the master to be copied, only the target sketch (Which is basically described in the first video), this then inhibits anyone from copy a slave to another slave, only the master (The programmer) should be able to do this job,

Something I've been thinking of doing is taking the Arduino Serial Programmer and altering it to take input from a SD card instead of the serial pins. My intention for it was as a quick way to program a lot of Atmega328's at a time without using my computer.

I did start working on it, I only managed to incorporate to sd card reading function into the sketch and had it output some text onto a LCD. Not sure if this is the sort of thing you were thinking of.