Modern Device Forum

I'm less puzzled about how the hardware works (which seems fairly simple) than how the software would work. In particular, how big a hit the processor takes to service the USB. Seems like it would need to be interrupt driven not to miss anything.

Paul

bperrybap,

This totally rocks. How did I miss this for four days.
I'm ordering my display right now.

You're absolutely correct about ease of use two - your breadboard is amazingly tidy.

Paul

The first thing to check the resistor that controls the current on the LED's - it's really the only resistor on the board I think, so should be easy to find. One resistor controls one chip, which controls two rows of LED's - so there's a smoking gun pointing at the resistor.

Check the value on the ...

I'm not following this suggestion.
I know in theory that it is possible to put the USB function into the Atmega chip, at the cost of some ram and a performance hit of some kind.
Has someone done this with Atmega 328's? I've seen some done with other Atmel chips - that I think had some hardware on ...

OK - One theory that's worth investigating is that you are seeing the data flowing through the chip when it updates.
Try this code. After digging through the datasheet of the new chip - I'm still a little confused but convinced it doesn't work the same way as old chips.

The new code just pulses ...

vapour,

COM ports have inverted serial, my board can't handle that. You can find boards that that will work which use the same chip but are slightly different in layout at wulfden.org .

Paul

jones,

i guess i got a question again.
Between every Frame all LEDs light up.
Of cours only 1 millisecond and very very slight,
but if you look exactly, you see it.
Can i fix it too?

I'm kind of baffled by this one.

Did you try increasing the frame delay and watching for the flash?
In theory ...

I think the problem is You're reading past the end of your array I think - thus the "crazy data".

Try this instead and see if it works

the question is what to do about the logic select header. If you cut around that it could work.

I hadn't thought of providing this with the kits but I could look into seeing how much it would be. The problem with that kind of heatshrink is that you have to buy a bit of it to get a decent price ...

bperrybap,

I'll be happy to turn pdf files on, but I'm out of town for a week at a wild open-source hardware conference. I don't have the passwords I need to get to the file that needs to be modified so it will have to wait till next Monday.

You could also email it to me as an attachment and I'll ...

There's a VCO in the LM358 datasheet. Also some in Op Amp Cookbook. These solutions tend to be integrated into chips these days though. Punch in Frequency to Voltage Converter in digikey search engine and see what comes up - Here's the category
http://search.digikey.com/scripts/DkSearch/dksus.dll ...

I'm really interested if it can be done on both the software side and hardware side without lots of fuss.
Maybe I can just make a super-BUB or an addon kit with the cable and six pin header.

Are all the signals it needs available, on present board?

Maybe send me a link, schematic or image and I ...

I had read about that setting with MPROG but it seemed to me that the BUB's we tested have all worked for both rx & tx "off the line". I wonder if I'm seeing a serial port echo or something. We develop on mostly macs so maybe it's some quirk with the way windows handles the serial port (or a mac ...

dear thebishhop,

Sorry the LCD won't work (it's looking for a TTL INPUT) as a converter. It will take TTL orders from the IPOD though.

You could use either our P4 board for RS232 connection or USB-BUB for USB for connecting to the IPOD board however.

Paul

I think a pdf would be most universal.
It's not that much work if people want to type it again to make their own.
I guess my second choice would be some kind of image file, such as a gif, in high enough res to look good small.

Thanks for doing this, AVR fans everywhere salute you,

Paul

Maybe just forward me the file. I'll put it up on the site and people can just print or photocopy them on label stock or something similar for no-cost, no-fuss solution.

Paul

Hey - amazing mod of budget synth, with a budget controller. Great video too.

Here's my one sentence plug.

Fat, crunchy and not too slick sound, perfect for reality based low rez techno.

Let's burn a board and make a kit.

PB

Maybe search for
"avr manchester encoding"

Here's one hit I got

http://www.frozeneskimo.com/electronics ... g/#more-63

Hopefully the translation won't be too painful - and you may get lucky and it will run out of the box.


Paul

BobW,

Hey glad you got it going and I'm glad that the chip uploads with no fuss - I've developed a few things working with pins 0 & 1 and it's not such a big deal, but usually you do have to pull out wires to low impedance loads - I guess the base transistors were large enough so they weren't an ...

Hopefully I fix the links to my store slightly faster.

pb