This is the first time i have ever made my own pcb and first time ever taking on a project from scratch like this, i enjoy it alot (but im cursing it at the same time too
)I used Synthex's all in one PCB design 2.5 located on this thread: (thread includes list of parts that i used)
http://www.megadrum.info/forums/viewtopic.php?f=3&t=198
To catch up to speed to where I'm at in my build here's a picture:
I know i'm missing the midi IC, however i'm assuming i dont need it if intend on using USB, the IC is on backorder from Mouser. I'm expecting it to ship about the 27th
The LED is missing from the board because i orginally put it in backwards, and when trying to remove it i started to remove some trace, so i follow the trace back to a terminal and soldered 2 ide wires (off to the left coming from under the pcb in the picture) so that i can have the LED off the board.
At first i had trouble programming the PIC18F2550, but after browsing around someone suggested using an external powersupply because some motherboards dont have enough juice over usb, which was exactly my case. I hooked it up to AC USB adaptered, and the ISCP for the PIC and the program automatically recognized it, and said the program was successful. However the USB is not recognized, and i cant get either xp or vista to even do anything when i plug in the usb.
As for the Atmega, i'm using an Atmega644, with a 20 MHz crystal, and programed the 32 input version using the ISCP cable for the Atmega. Again, the program said successful. I can even verify that it works by hooking a piezo up to the kick channel, and giving it a few taps, and the LED lights verifying the signal.
LCD is a different story. I think i get better results hooking up the backwards (which i stupidly did in the first place)...
When hooked up correctly i get the top row all solid boxes, and never changes (contrast can fade, but input does nothing). When it is hooked up backwards the top row is still solid boxes, but they alittle faded (contrast does very little to change that) , however with input the the whole row flickers either getting dimmer or a quick flash. This is from either input from the controls or the piezo.
So right now i'm having two problems:
USB - Windows does not detect anything when plugged in, no little bubble on the bottom right, nothing...
LCD - The screen does not display anything that would resemble the MegaDrum, it reacts only when plugged in backwards:
LCD TERMINAL:
Correct:
- Code: Select all
16 15
14 13
12 11
10 9
8 7
6 5
4 3
2 1
Mistake:
- Code: Select all
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
I really love working on this thing, but i've checked all the traces and connections to the best of my knowledge, and now am in a jam, appreciate any bit of help, Thanks.