November 4th, 2009

DIY iPhone like device

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320240 LCD with resistive touch screen, USB, SD card, 3d engine, USB, movie playback, UI interface, sprite engine , would you believe all of this is handled by an AVR 8 bit device with 4K RAM running at just 12 MHz ? You’d better believe it because it’s real. Well the ATmega644 runs at only 12 MHz because it’s powered at 3.3 V so as you can imagine it’s stretched to it’s limit. The LCD with the integrated controller helps allot taking the job from the microcontroller.

The Pacman demo just fits in 8K flash and 512 bytes of RAM. It uses the sprite engine and runs at > 60fps. The images and animations don’t even touch the RAM they go straight from the SD card to the display. It turns out reading a 512 byte block from the SD takes ~1ms.

Source code, demo files, Eagle PCB and schematics are provided at the projects SF page.

DIY iPhone like device: [via Hackaday] – [Link]

July 28th, 2008

The Truth Behind SD Cards

The Truth Behind SD Cards

I don’t know that this title make you think off, but i couldn’t express better the subject. We’re talking about SD cards that are not what you’d expect them to be. Sparfun electronics accidentally discovered while looking inside an SD card that it actually contains a micro SD card soldered to the SD pins. The job looks like it is hand soldered so the guys from sparkfun think there must have been a huge batch of microSD cards and a perceived shortage of full size SD cards.

The Truth Behind SD Cards: [Link]

EchoMp3 Another DIY MP3 Player

I say another, because we all know the DIY MP3 Player and the AVR Butterfly MP3 Player. This mp3 player can support up to 4 GB of storage (MMC or SD cards) runs from a single AAA battery and has full user control (volume, track, pause, skip, directory) with a 5-way micro joystick.

Also the LCD has contrast control, you can record voice and the firm-wire is totally upgradeable trough RS232. In fact this DIY MP3 player is the coolest I’ve seen so far and it’s full of tricks.

EchoMp3 Another DIY MP3 Player: [Link]



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