You’ve probably seen the article about the Asus Eee PC and what can be integrated inside it’s case. But after you’ve done some modding and added different devices your battery probably doesn’t last as it was intended to last, so if you need to charge it in the car you either buy a commercial adapter or you make it.
This projects shows details on how to build an Eee Pc car charger. There are actually a small number of parts so the whole cost should be small.
ASUS Eee Pc Car Charger: [Link]
The Gas Guzzler Meter is an attempt at putting an immediate dollar value on your current driving techniques: a digital meter that displays exactly what you’re spending as you motor along. Stomp on the pedal and see the bucks zoom out your tailpipe faster than a NASCAR driver competing for the Nextel Cup. This device will help you impress your friends, drive responsibly, and keep those dollars in your pocket.
Gas Guzzler Meter: [Link]
Why pay hundreds for a commercial Data Acquisition System when you can build the PIC DAS for less than $50.00? The PIC DAS is built around a Microchip PIC16C63A microcontroller and contains an 8 bit bidirectional Digital I/O port, 12 bit, 8 channel A/D converter and a 12 bit, 4 channel output D/A converter. It is perfect for quickly controlling any project on your workbench! Use the Digital I/O to sense switch closures with the help from the built-in weak pullups, control OPAMP’s, power supplies and the like with the built-in D/A converters.
Measure temperature or sense voltage or current with the built-in A/D converter. The real usefulness of this system is that it has a known simple to use interface that uses real ASCII commands over an RS232 link. This method of control saves programming time that would otherwise be wasted controlling the test setup, instead of actually doing the test.
PIC Based - Data Acquisition System: [Link]
The idea of an annoying beep device it’s pretty original and I’m sure it works on everyone. So here is how it works, the thing is damn small because it only contains the ATTiny2313, a piezzo speaker a resistor and a capacitor, thus beeing easy to hide; you carefully hide the device into a friends house. The device will start emitting a beep sound at random intervals of time. The time between beeps is anywhere within half an hour to nine hours.
Your friend will start looking for the source of the beep among his gadgets like mobile phones, tv, etc, not knowing that the beep is coming from the prank device. Just imagine yourself into this situation, it will drive you nuts :). And there’s another feature of the device, the small battery will last forever because the device only draws 200uA.
Annoying Beep Prank Device: [Link]
The author made the project for a friend who wanted to include it into an amplifier as an extra function. The project turned out really well and it works flawless. It’s based on the ATmega8 and it uses a 4 digit 7 segments common anodes led display to show the time. The code is pretty simple, written in C, but it lacks comments as the author did not felt the need to add them.
4 Digit ATmega8 Clock: [Link]