Sequential Battery Charging


I’m getting pretty interested in building an electric motorcycle, and I ran across this little hack to charge multiple batteries with one charger. It uses a 4020 counter that’s pulsed by my dear friend the 555 to activate a series of relay pairs to switch a single charger sequentially between battery cells. A more advanced version could use a microcontroller to monitor the state of each cell to ensure even charging. If you’re thinking of constructing an uber-ups, this could be useful.

Hack Day Winners


Yahoo recently held *Ahem* Hack Day developers conference/workshop. The winner’s pictured – a ‘blogging purse’. It looks like it just uploads images. The details are a bit on the weak side, but some of the stuff looks neat. The purse contains a camera, basic stamp, pedometer and Nokia phone.
The YBox is some sort of network to TV gateway (Microcontroller, Ethernet, IR reciever, RF out in an altoids tin). Looks like it pulls data from yahoo channels, but supposedly it’s configurable for custom data.

Speaking of contests, [David] pointed out this ARM design contest – entering will garner you a free dev kit.

DIY Audio Interconnects


This is one of those things that has annoyed me for so long, that I’m putting it up. I have despised, no, I have friggin loathed the quality of 1/8″ (3.5mm) cables. Cables are pretty easy; just clip, strip and solder away, right? Right. If you grew up cursed with the junk that rat shack carries, you know my pain. So, if you hate those crappy cables as much as I do, go check out this lovely little write up on making quality interconnects. (Now if I could just find a 2.5mm connector like that switchcraft 3.5mm to fix this spare apple power supply)

Inker – The Hand Inkjet


One of our Hackaday favorites, [Sprite_tm] made my morning when he sent this in. He built a driver circuit for a HP inkjet cartridge that allows him to print by hand. Ideal for printing on other people, their white boards or their beer. He had to do some blackbox reverse engineering to figure out what the onboard driver chip does on the cartridge. Considering the task, the circuit is surprisingly simple. It has some ATTINY brains, some driver transistors, a data bus and a DC/DC power converter to get the required 1.21 gigawatts, er 20 volts to drive the cartridge.

Saturday Morning Extra

Storage element keychain. Allright, it’s cool, but almost criminal.

Hack a wireless doorbell into a remote relay. It’s allright, but I like the Mr. House + APRS tracking better.

[Josh and PsychoRNGD] both sent in the mindstorm NXT laser hack (Replace the LED in a light unit with a laser pointer diode)

Matt sent along his XBox 180. I dig it just because it gets rid of all those friggin wires.

[XanTium] points out that MS’s latest drive in the 360 takes things to a few extremes to block firmware hacking.

[Mike] let us know that after all the grief he got here, he built an aux to female ipod cable for his sound-dock. (He got his femal ipod connector from Ridax, but Sparkfun now carries a surface mount version)

You guys sent in some great tips this week. Keep em comin. I’ve been busy, but I’m going to hunt down the floating ads and get them taken care of.