AVR Laptop Pushes The Limits Of 8-Bit

If you saw a device that had a laptop form factor playing sound and video, alt-tabbing over to play a game or take some notes, then back to the video — well, that’s normal; that’s what laptops do. If you learned the heart of this machine was an Arduino-compatible AVR microcontroller board, you’d probably do the same spit-take we did. Well, put down your coffee, because [Vladimir]’s AVR Laptop project really is that impressive.

The micro at the heart of this amazing laptop is an ATmega2560. That’s a pretty powerful chip by 8-bit microcontroller standards, but it’s still an 8-bit microcontroller, so getting the FreeRTOS-based system and all of the functions he wants onboard took some careful coding. The ST7920 128×64 monochrome LCD isn’t being driven by any standard library, for example — [Vladimir] built his own driver that does only what he wants. Even in 1-bit color, getting 24 fps video playback was a challenge, especially with sound, and the write-up gets into how that was accomplished.

The code is pending review before release, but we do look forward to seeing how he pulled it all off. In the meantime, we can at least watch it in action in the demo video embedded below.

The vibe of making an 8-bit machine do things you don’t expect to fit in 8 bits reminds us of SymbOS for the Z80. For the sysadmins out there, we’ve also seen an AVR web server.

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Character LCD Screen Add-on For Android Devices

Here’s an Android accessory project that adds a secondary LCD display. It utilizes the Android Open Accessory Development Kit standard to connect the 16×2 character LCD as a USB device. It pairs an app on the phone which runs transparently with firmware for the ATmega2560-based Arduino compatible board you see to the left. The app launches as soon as the auxiliary hardware is connected and is responsible for determining which lines of text are pushed out to the LCD. The example code displays the current time on the top line, and scrolls incoming text messages as they are received.

This is a good way to get your feet wet with the ADK hardware. We’ve already seen it used for larger displays like this LED marquee, but this smaller test project doesn’t require much hardware setup. Chances are you either already have an Arduino and character LCD on hand, or can easily borrow which makes this an easy weekend project.

One note on that Arduino compatible board; it’s called a Freakduino ADK but we couldn’t figure out if it’s a Freak Labs product or not. If you have some insight about that, please leave a comment.