New 2.2" color LCD option

[tddrummer]

Dmitri,
Thanks for the info on your table. What are you using for a vacuum source?
Thanks

[dmitri]

I use an 8cfm vacuum pump.

[Jorns Bergenson]

I've been searching for a couple of hours looking through posts and schematics and cannot see how to connect the color displays to the MegaDrum module. There is a mention of a pin header that is not populated on MD boards that the color display connects to but I can't find the connector or the pinouts.

Can anyone help with this information?
Thanks,
Jorns

Edit: I must say that I find the documentation for the MegaDrum kit very confusing. In this post about MegaDrumKit viewtopic.php?f=3&t=1420, it shows pictures of the MegaDrum STM32 board, but the diagrams in the instruction manual from that post show a completely different layout of the board. The connector names in the schematic do not match the what is silk-screened on the board. There is no mention about how to connect the color display in that post or the instruction manual.

[dmitri]

Color LCDs connection diagram is in ' MegaDrum kit - instruction manual.pdf' from http://www.megadrum.info/forums/viewtop ... f=3&t=1420.
What connector names don't match silk-screen on the board?

[Jorns Bergenson]

Color LCDs connection diagram is in ' MegaDrum kit - instruction manual.pdf' from viewtopic.php?f=3&t=1420.
What connector names don't match silk-screen on the board?

I must have downloaded the new manual into my "Downloads" directory but opened the old version from the files I downloaded back in December. I'll figure that out when I get home. Sorry for the confusion and thank you for your patience and help.

[Jorns Bergenson]

Today, I received a couple of 2.2" color LCD modules that I was intending on using on a 56-input MegaDrum module that I've ordered. Since I ordered an extra color LCD, I decided to try attaching it to my MegaDrum Lite board. After adding a connector with the extra signals needed for the LCD, it came up without a hitch.

I would not advise anyone to try modification unless:

1. You have lots of experience performing re-work on PCBs with surface mounted parts
2. You have the right equipment (soldering workstation with temperature control, microscope, soldering tips designed for SMD work, the proper hair-thin solder, flux, etc)
3. You can afford to destroy your MegaDrum Lite board. It is very easy to burn up the PCB or the STM32 even if you know what you are doing

As an electrical engineer, I've been working with PCBs and prototyping for 30+ years and this still took me a couple of hours to solder this up. Even though I was careful with the heat, I still had one of the pads under the MCU's pins "float" off the PCB. So, as they say, don't try this at home!

So, with no further ado, here is the 2.2" color module connected to MD-Lite:



A picture of the module I bought from eBay:



I added a 5-pin connector with the extra signals needed for the color display. The connector is equivalent to connector P6 from the schematic in the Megadrum Kit instruction manual attached to this post: http://www.megadrum.info/forums/viewtopic.php?f=3&t=1420

[stefan1982]

Could you make a video?

[Jorns Bergenson]

Could you make a video?

Are you directing the question to me regarding MegaDrum-Lite? If so, I'm not sure what you want to see in a video. The color display works the same on MegaDrum Lite as it does MegaDrum Full. For a video demo of the color display see the first post in this thread.

[tddrummer]

Dmitri,
I have finally hooked up my display to the MD. It does not appear to be working correctly. All I am getting is a white screen. I have tried two displays. One of them is known good. Do I have a bad MD board? I am attaching a picture of the screen. All of the hook ups are according to the manual. The 200 ohm resistor is also installed. NOTE: I had to use pin 16 for the LED like one of the previous users did. Also, I have tried both the original frimware 20160303 and the newest 20160529, both have the same behavior.
Any help would be greatly appreciated.
Thanks

[dmitri]

I can only suspect that you have not wired it correctly. If you're absolutely sure that it is wired correctly then the only other possibility is that the main board is damaged.