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Author Topic: Arduino clones with more RAM than Uno?  (Read 4150 times)
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vermont
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thanks. im using the standard bobuino16mhz at the moment but both those links may prove useful. tom gave me a set of his customized bootloaders and while the m8 ones worked im having no luck with any of the m1284 ones. maybe for some of the reasons discussed in that thread. thanks again.
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It works!!! I just tried it with Mega 2560 and it has enough RAM to run my clock and WaveShield!!!  Mega 2560 was just a proof of concept, now I need to get it working on 644p (which just arrived). Thank you all for you suggestions!
« Last Edit: November 21, 2012, 06:43:23 pm by bratan » Logged

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 I like your work and your display! The voice sounds pretty good too!

 What is the distance between LEDs on the display? I am thinking about making one similar but, I need to know how far apart to put the LEDs to make it look nice like yours.
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Those look like dual color 8x8 matrices.
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 I like your work and your display! The voice sounds pretty good too!

 What is the distance between LEDs on the display? I am thinking about making one similar but, I need to know how far apart to put the LEDs to make it look nice like yours.
Thanks! smiley
I'm not sure about distance (probably around 2 mm), I'm actually using premade 32x16 bicolor board from Sure electronics  (DE-DP14112). It has 8 3mm 8x8 Green-Red LED matrices and driven by HT1632c ICs so it needs just 4 wires to connect to arduino (plus 2 for power supply). Previously I tried making display with other 8x8 LED matrices but it proved a little challenging to drive them. You can build your own and drive it with MAX7219 (2 per matrix) if you are good with PCB making. Those LED matrices arrange nicely, just put them back to back (most of them have grooves that allows them to arranged tightly next to each other, almost like lego).  I think it's more practical to use 8x8 LED matrices rather than making your own from separate LEDs, but of course it's up to you smiley
Bicolor 8x8 can be found for as low as $1 each on eBay, and 32x16 display costs a little over $30.
Sure's matricies in DE-DP14112 are also much smaller than other 3mm 8x8 I was able to find. I don't know if it's good or bad, it will give you more DPI resolution, but smaller display overall...
But if you are planning
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It would be interesting to see if that could be made to work with the SimpleSDAudio library. That is now capable of up to (pseudo) 16 bit Stereo direct from 1-4 PWM pins and an SD Card adapter. The Wav shield could then be removed. I've used this library in 8 bit mono using a single pin and it sounded good enough for simple sound effects and voices. It ran some Red Dwarf and Stargate voice clips very well, just into a PC speaker input.
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It would be interesting to see if that could be made to work with the SimpleSDAudio library. That is now capable of up to (pseudo) 16 bit Stereo direct from 1-4 PWM pins and an SD Card adapter. The Wav shield could then be removed. I've used this library in 8 bit mono using a single pin and it sounded good enough for simple sound effects and voices. It ran some Red Dwarf and Stargate voice clips very well, just into a PC speaker input.
Wow I never heard of this. Sounds amazing, I definitely give it a try. If I can get rid of wave shield it would be like a miracle. Thanks for the info!
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@bratan and tack

I highly recommend the SimpleSDAudio library. You get good audio with minimal parts. I am working on a board which has buffers and an amplifying filter to improve audio further, but it is pretty good as it is.

I am porting the SimpleSDLibrary over to ChipKit compatible boards to hopefully take advantage of more powerful computation at a lower price point. I have a video of the preliminary port (which I refer to as BasicSDAudio, to distinguish from the pure Arduino version) here:

http://cobrainnovations.blogspot.com/2012/10/basicsdaudio-chipkit-library.html

I am also editing a new ChipKit compatible board, the FubarinoSDt. It uses an 80MHz, 512k Flash, 32k RAM, 32bit PIC processor and has a microSD socket and native USB in a breadboard form factor. With built in SD, this board will prove very useful for audio projects. If I do decide to make them available for sale, $25 is the target price. Check it out:

http://cobrainnovations.blogspot.com/2012/12/fubarinosdt.html
http://cobrainnovations.blogspot.com/2012/11/fubarino-sd-new-pic32-dev-board-on-block.html


-Thomas
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