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OGX360i-4CH :)


Dtomcat18
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Working on some 360i’s. If it works out… I’ll be posting better documentation so others can make them. Took a lot of homework studying the schematics to be able to build these :)  

Only have the main boards built so far.  Still need to make the daughter boards and wire harnesses. 
 

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Some documentation would be great.  The details on making the internal 2CH/4CH are pretty slim.  I started the process of making the 2CH however I hit a snag with burning the boot loaders onto the Atmega32u4's.

I am curious how you are burning the boot loaders in your setup.  My understanding is that you could transplant the 32u4's from existing Arduino's or you can use a clamshell adapter/ breadboard setup to program individual 32u4's on their own.

I am using these two pages as a reference:

https://murchlabs.com/monday-experiment-bootloading-an-atmega32u4-with-arduino/

https://electronut.in/bootloader-atmega32u4/

The main difference with my setup is that I am using the clamshell adapter instead of a breakout board.  Here is a video of similar situation for a 328p:

 

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On 9/12/2022 at 5:01 PM, booyabeetz said:

Yup. Thats exactly what I need to see.  Maybe I am not that far off.  Here is what my rig looks like right now.  I have changed it several times trying to get it to work:

 
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Just thought of something.   A lot of these clamshell adapters have messed up pin numbering.   So chip pin one is like pin 5 or 6 on my adapter.  Did you account for this?   That may be your issue 

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On 9/18/2022 at 3:37 AM, Dtomcat18 said:

Just thought of something.   A lot of these clamshell adapters have messed up pin numbering.   So chip pin one is like pin 5 or 6 on my adapter.  Did you account for this?   That may be your issue 

Yikes, I never considered that as a possibility.  I guess I will have to check everything with a multimeter.  Thank you for the heads up.

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12 hours ago, Dtomcat18 said:

Here is what I made to make a little more professional look :)  Just ordered a set of boards... now just wait the month it takes to come from China :)

AtmegaProgrammer.png

Thats so cool!  I really need to start tinkering with KiCad one day.  Do you have a github repo going for this?

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23 hours ago, Dtomcat18 said:

Finally made a programming cable... and I'm able to run the flash and run the test firmware (passes) and then flash the main firmware back....  Working Great.   Now to build the main Harness and do a final test. ::fingers crossed::

Awesome!  Keep us posted.

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On 9/19/2022 at 8:37 AM, booyabeetz said:

Yikes, I never considered that as a possibility.  I guess I will have to check everything with a multimeter.  Thank you for the heads up.

Did you ever check the pins.  Looks like same adapter I used and I bet the pins are off

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1 hour ago, Dtomcat18 said:

Did you ever check the pins.  Looks like same adapter I used and I bet the pins are off

Thank you for the reminder.  I just beeped out a handful right now with a multimeter and its exactly like you suggested.  The numbering for the pins on the chip and the numbering for the pins on the adapter are completely different.  What a mess.  Now I see why you designed your PCB to mate with the clamshell directly.

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Success!   All the boards are working :)  What a relief.   Just have to get the rest of the harnesses complete and ship them to the buyer!

I did find one wiring issue (had a 50/50 chance of getting it right... and of course I didn't).  After making that change, everything is working!  After I get these out the door, I'll fork the Github and update it with my findings.  I'll make a BOM, wire harness guidelines/schematic, etc.  Once it's up, I'll post here... probably at least a month out.

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4 hours ago, Dtomcat18 said:

Success!   All the boards are working :)  What a relief.   Just have to get the rest of the harnesses complete and ship them to the buyer!

I did find one wiring issue (had a 50/50 chance of getting it right... and of course I didn't).  After making that change, everything is working!  After I get these out the door, I'll fork the Github and update it with my findings.  I'll make a BOM, wire harness guidelines/schematic, etc.  Once it's up, I'll post here... probably at least a month out.

That's great news.  The wiring harness stuff is another area that I am completely unfamiliar with.  Getting some additional documentation on this would be a huge deal.

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Board startup date: April 23, 2017 12:45:48
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