[ned] received a free X10 RF remote. He popped it open to discover that the device is actually based on a PIC. By replacing the PIC with his own he’s able to issue any X10 command using the remote to any device in the system. He did spend a lot of time with a logic analyzer to try and figure out the protocol, but later found some good reference links. He hopes this will make it easier to connect his PIC projects to the X10 system since this remote doesn’t have to be plugged into the wall like the X10 serial interfaces.

Continue reading “X10 PIC Based RF Remote” →

Limor a.k.a. Ladyada has been a long standing staple in the Hack-A-Day community and we were more than happy to hear about her latest project. The Minty Boost is an improvement on the idea of building a battery powered USB charger. Most designs (including ours) use a 7805 linear regulator with a 9V battery. Even in the best case the regulator is only about 60% efficient which means you’re losing at least 1/3 of the power to heat. Limor’s design is a much more efficient boost converter design and uses far more common (and rechargeable) AA batteries. She’s got a thorough write up on how to build the converter in an Altoids gum tin. The end result is 82% efficient and can effectively double the play time of a video iPod.

The guide doesn’t end there. Limor actually wrote this as a demonstration on what goes into a making a kittable project. She covers the entire process from component selection, to mass PCB production, to what her final cost break down is. The guide is full of pictures thanks to some good planning as well. Of course the most interesting thing we learned from the guide is this: despite using the tins all the time, Limor finds the taste of Altoids gum disgusting.

[The guide is on her site, but we’re linking to the version on Instructables since we’ve managed to DDOS her site in the past… by announcing that her site was back online.]

Continue reading “Minty Boost, AA Based USB Charger” →

We’ve covered the toner transfer method for creating circuit boards before. Instead of using an iron, Rich uses the fuser out of a laser printer to get consistent results. He wired a dimmer to the power supply to regulate the temperature. The fuser has a built in thermistor, so you can read the temp using an ohm meter. For rate control he built a stepper controller that connects to a parallel port. Using a simple program he’s able to control both speed and direction.

[thanks Fredasp]

Continue reading “PCB Fuser For Toner Transfer Etching” →

The Alesis HR-16 was an inexpensive, easy-to-use MIDI drum machine from the early ’90s. [Burnkit2600] had a lot of experience circuit bending the HR-16 and decided to burn some custom sound ROMs for it. The HR-16 has two 32-pin ROMs that are conveniently socketed. He pulled the chips and dumped the image using an EPROM reader/writer. The ROM only contains sound samples, so you can open it up in raw mode using a program like Sound Forge. The samples are separated by short negative regions. All you need to do is place your new samples between the pits and burn a new ROM. You can piggy back the chips using the chip enable line to add even more samples.

Continue reading “Burning Custom Drum Machine Sound ROMs” →

Gerald Heine’s stereo microscope uses a field sequential method for generating 3D video. A CRT draws half the screen’s lines with each frame. So, if you send the video from two different cameras on alternating frames you can generate a 3D using shutter glasses. Gerald’s setup uses the sync signal from one camera to control the other. Both video signals are fed into his custom 3D video sync box which combines the frames into a single video feed and also outputs a control signal for shutter glasses.

Continue reading “3D Video Microscope” →

Not everyone can have a cute alarm clock that runs away from you like Clocky. Most just resolve to place the clock on the other end of the room so they have to get out of bed to switch it off. That’s what [ryan] had to do to get up in the morning. He wasn’t able to set the time or confirm that the alarm was on from bed anymore so he decided to hack in an IR remote for his alarm. Ryan has written a thorough article on how he decoded the remote codes and implemented the clock control using an ATMEGA8. Now he can just key in the time he wants and the microcontroller takes care of setting it.

Continue reading “Remote Controlled Alarm Clock” →

This project is designed to fade between seven different colors using an RGB LED. To keep things simple, Flakko decided to avoid PWM using a microcontroller. He used a binary counter to cycle through the color sequence. To do the fading between colors he added an RC filter. It’s a pretty simple device and the parts are more common than the ones in the Bit-tech article he referenced. YouTube video of the fader.

[thanks Javier Flores]

Continue reading “Simple RGB Flasher” →