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22 Sep 2007


Unlike traditional projectors, the Pico Projector “prototype uses red, green, and blue lasers and a digital micromirror array (ultraminiaturized DLP technology) to pump out a bright picture.” Video after the break. Click here for additional images.

The production version will probably rely on LEDs which are cheaper, cooler (in the thermal sense), and more efficient, but most likely a bit dimmer.

Pico Cell Phone Projector – [Link]


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22 Sep 2007


Micro PSU to power a breadboard with 5 volts. Connect to 9V battery, 12V or any other DC powersource from 8 to 18 volts. Follow the instructions on the site below to build your own mini 5V power supply.

5V breadboard mini PSU – [Link]

22 Sep 2007


Larry J Solomon writes:

I have heard, even from a physicist, that it is impossible to build FM crystal radios. On the other hand some experimenters claim that they have built them. This argument intrigued me to try and build an FM crystal radio, which I have done successfully. To my surprise, the result is an astounding performer, pulling in four local stations in Tucson. When connected as a receiver to a good sound system the sound fidelity is as good or better than more expensive AM radios. In fact, it sounds “high-fidelity”.

FM Crystal Radios – [Link]

22 Sep 2007


Tom Lackamp writes:

The All-in-one remote has been designed as a versatile, portable photographic accessory that you can tuck in your camera bag. It combines a number of useful features that you will provide capabilities that you’ll find both useful and fun during your field, home, or perhaps even studio photography.

In one box, you’ll find a wired remote, a wireless remote, a power supply for your camera, a versatile intervalometer, and an interface to devices such as pressure-sensitive pads, trip wires, etc, that can take a picture when your subject trips the trigger device.

The unit can be set for a normal exposure, bulb exposure, or programmable time exposure from 1/10 second to almost 1000 hours. You can program the intervalometer to pause between pictures anywhere between 0 seconds and almost 1000 hours. It will stop taking pictures after the number of shots you specify so you won’t overfill your digicam’s memory card capacity.

All in one remote for cameras – [Link]

21 Sep 2007


Octopart has a multi-vendoe shopping cart for your parts now, check it out –

While you’re searching for parts, add the ones you’d like to buy to your partlist. When you’re done, click the buy button to start choosing distributors you want to purchase the parts from. After you’ve made all your choices, you can checkout from each distributor from our checkout page. While we do not have direct online checkout available for all distributors, we will be adding more as quickly as possible. In the meantime, download a summary of the parts you are purchasing so you can place an order the old-fashioned way.

Cross-distributor shopping cart @ Octopart – [Link]


21 Sep 2007


Dim writes:

This pattern generator is based on an ATMEGA8 running at 16MHZ. It can produce 14 images that can be used for tv testing. The generator runs in RGB mode in B/G system. For composite video you need a RGB to PAL converter.I used a MC1377P but is absolete know. Another option is to use an AD724 or AD725.The images can be selected one by one by pressing the select switch. With the other three switches you can kill each color in raster mode.

TV test pattern generator – [Link]

21 Sep 2007


This site is dedicated to the development of an ethernet enabled Arduino (ATMega168*) using Microchip’s ENC28J60 IC. It based on Procyon AVRLib. However, on the contrary of the library one of the main goals of the code is to free the µC as much as possible from processing by using built-in features from the PHY. Although this has negative effect on porting the code, it is a necessary step to obtain a viable network solution for a small chip like the ATMega168.

Ethduino Development Board – [Link]

21 Sep 2007


Steven J. Murdoch writes:

This page shows some photos of two dismantled Dallas iButtons, a DS1922L (Thermochron) temperature logger and a DS1923 (Hygrochron) temperature/humidity logger. They were rendered unusable due to a bug in the humalog example application provided by Dallas. Removing the battery would take them out of the error state and I was curious so I decided to open them up.

 iButton disassembly – [Link]

18 Sep 2007


 Dim writes:

This project is based on a DS1621 I2C Thermometer with Thermostat and an AT90S2313. If you have problems find them you can replace the first with DS1631 and the second with ATTINY2313. The temperature range is 0-125C. The thermostat range is 10-40C and you can set it with up or down buttons. With on/off switch you can turn on and off the load control. When is set to off the device acts as simple thermometer. You can use the ISP header JP1 to program the AVR on board.

 DS1621 Thermometer with Thermostat  – [Link]

18 Sep 2007


 Dim writes:

This is an electronic lock that uses the Dallas i-Button DS1990. With the touch of the i-Button the device drives an electric lock or an electric striker. You can store up to 20 keys in memory plus a master key. The heart of the circuit is an AVR ATMEGA32 microcontroller running with its internal clock at 8MHZ.  The DS1307 clock is used for the time and the MAX232 is used as level translator for RS-232 signals. The 1-wire protocol used by dallas permits a cable length of up to 200 meters.

Full schematics, pcb board and hex files are available under Downloads section of the site below:

i-Button Electronic Lock – [Link]





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