Reverse Engineering Off-brand Media Players

December 23, 2009 by Mike Szczys 14 Comments

[Marcan] picked up this device on the cheap and is working to reverse engineer the controller. This media player is an off-brand Chinese model that can be had for the low-low price of $33.97 with free shipping. That’s worth it just to scavenge the parts for other projects, but the challenge here is to hack the controller because a datasheet was never produced for it. Warm up your logic analyzer, check out the wiki, and you can be pounding away at this ARM926EJ-S based system in no time.

The call to arms comes from [Marcan’s] blog. You may remember him as the guy who is working to solidify iPhone sync in Linux or… what else did he do? Oh yeah, he had this little project called the Wii Homebrew Channel a while ago. Get involved and you can learn from some folks who really know what they’re doing.

[Thanks Mr. Seeker]

Home Made Panoramic Camera

December 21, 2009 by Caleb Kraft 6 Comments

This one is from way back in 2002, but we didn’t see it till today. This is a hand built panoramic camera. The film is laid out across the back of the case, and when taking a picture, the lens assembly rotates to expose the film. It is a very nice looking design. The brass body is quite reminiscent of the recent one posted here. On the site, you’ll find not only the build log, but a full explanation of all the math behind the design. It is a very interesting read, even if you have no plans on building your own.

[via Make]

Accessing BGA Pins

December 17, 2009 by Mike Szczys 29 Comments

[Philip] developed a method of tracking down the pins of a Ball Grid Array. He wanted to do so in order to add USB host functionality to his HP Jordan 720. The method doesn’t directly connect to the BGA but instead finds a via or other access point to serve as a solder point. He first looks up the pin in the BGA datasheet. Once located, he uses the bristle of a toothbrush (teal) to act as a backstop and feeds in some enameled wire (brown) to the appropriate ball. A multimeter is used to check connectivity between the wire and the vias around the chip.

Patience young grasshopper, this should work but it might take a while.

2600 Game Jukebox

December 16, 2009 by Mike Szczys 22 Comments

[Yuppicide] sent us a link to a photo album of an Atari 2600 modified to play ROMs stored inside. We did some digging around and have an idea of what’s going on. It seems that the creator, [Victor] has taken his Atari 2600 cartridge emulator one step further.

Previously, he had replaced the chip in an Atari cartridge with an EEPROM that he could reprogram via a ribbon cable. This new iteration places that EEPROM inside the case of the gaming console along with a PIC development board. The PIC board interfaces an SD card with somewhere around 1200 ROMs on it. Three switches added to the front of the Atari allow the user to cycle through available games and flash the desired title to the EEPROM. As you can see, a 2×16 LCD display now resides in the cartridge opening.

This seems a little more eloquent (and less legal) than the Super Genintari.

Automotive Current Monitor

December 16, 2009 by Mike Szczys 27 Comments

If you’ve ever had a car with an electrical system problem you know how hard it can be to pin-point the source of your woes. Here’s a hackery solution that uses a diy PCB to monitor the current being drawn off of the alternator.The sensing is provided by an Allegro ACS758 integrated circuit. This chip measures current up to 150A and outputs an analog signal that can be measured by a microcontroller. In this case an AVR ATmega8 measures the signal and spits the info back to a PC via the serial port. This data can be graphed to help locate when too much current is being drawn for the battery to remain charged.

Check out that CNC milled PCB, what a beauty!

[Thanks Joshua via Elektronika]

Embedded Games: Rogue

December 12, 2009 by Mike Szczys 10 Comments

Here’s a handheld version of Rogue. Rogue is one of the first graphical computer games and takes the player through a dungeon-exploring adventure. [Manuel] built this around a PIC 16F876 microcontroller and a KS0108 graphic LCD screen.

Hot on the heels of the pixellated Mario game, these embedded handhelds make for fun projects and great gifts. There are few parts used and [Manuel] etched his own PCB. Take a look at the schematic, this is a great platform to start with but the sky’s the limit on writing your own games.

FPGA Driver For PSP Screen

December 12, 2009 by Mike Szczys 20 Comments

Friends are constantly giving us their old electronics. We love it because our junk box is a never-ending pile of possibilities. We’re really starting to amass a collection of LCD screens that are not easily interfaced and this project gives us some hope for the future. [Philip] has been posting about using an FPGA as a driver for a replacement PSP LCD screen.

Many projects source cell phone LCD screens that have their own driver chip that can be addressed over SPI for use with a simple microcontroller. More complicated screens need a more involved control scheme and this is where the Field Programmable Gate Array takes over. [Philip] lays out the steps he’s using to implement his controller, from setting up the correct voltage levels, to planning for coordinate addressing, and even some of his follies with reverse current. We think this would be a great way to introduce yourself to FPGA projects.