Now this is a project to pay attention to. I dont know about you but i’ve always been a fan of scrolling text displays. This is cool. You can use it on pc casing moding, or anywhere else where you might want to add this nice effect. The text can be sent via RS232 interface from a computer, or it can be saved on a EEPROM memory. Fonts set of 256 different characters can also be programmed and mast be written to EEPROM before sending text to display. The author provides you with full info on building the project and also on the firmware.
This project is for detecting human ECG (Electrocardiogram, or EKG). A tiny amplifier is embedded (<1mA). The on-chip Timer, ADC and DMA (double buffering) are used for getting ECG data. An IIR filter and hardware LCD scrolling are used for ECG rendering. User can simply touch the Primer by 2 hands, his/her ECG trace is scrolling alive on the LCD screen. The instant heart rate is displayed with beep sound and LED flashing. The device also delivers and displays the ECG on a PC through the USB cable.
This iPod Touch “Pixelizer” filter by Franko Dodonpa is a really simple way to turn your Personal Media Player into a nice conversation piece at your next party. Plus it’s a pretty simple project you can build in a few hours.
This is a low power consuming fm transmitter with a decent range of 30 meters. Talking about the applications of this project we go into the spy area again. This circuit can be used to listen conversations from 30 meters away, or it can be adjusted to transmit the phone line. I am sure you can find many other applications, its your imagination. Main advantage of this circuit is that power supply is a 1.5Volts cell (any size) which makes it possible to fix PCB and the battery into very tight places. Transmitter even runs with standard NiCd rechargeable cells, for example a 750mAh AA size battery runs it about 500 hours (while it drags 1.4mA at 1.24V) which equals to 20 days. You will find full info and schematics on authors page.
Here is a countdown timer base on the versatile PIC16F84A, with so many practical applications, nothing illegal though. The time range can be adjusted between 1 and 99 minutes. It displays time sequence on BCD decoded 7 segment LED display. When count down finishes, the microcontroller send’s a control signal to a relay, giving you the possibility to control anything you want at the end of the relay. The board is assembled on soldering technique so no PCB design is available or needed. The project as well as the source code for PIC16F84A is very well documented and explained, so this is a good project even for advanced beginners, you could consider this as your first microcontroller project, you will sure remember it.
