This project shows the temperature on a three digit 7-segment display, it measures the temperature from -9.5 to 99 degrees Celcius in 0.5 C steps, or from 0 to 210 degrees Fahrenheit in 1.0 degrees steps. Because of the LED display the temperature is also readable in the dark. The TCN75 from MicroChip is used [...]

This code is for a simple RGB LED controller for 8 LEDs using a PIC16F628. The PIC selects each LED then turns on/off the respective colors then goes to the next LED. Source: Semifluid

How to make a simple yet professional looking UV lightbox for PCB production. With a few items salvaged and picked up in a sales you can make an effective PCB exposure box for less than half the price of the cheapest commercial boxes. I have made four of these units (some double sided) yet still [...]

The RGB LED driver described on this page uses logic level ‘N’ channel MOSFETs which allow it to control LED arrays or lamps at up to 5 amps per channel without heatsinks. The driver uses exactly the same firmware as the small RGB LED driver so you can use the same code and sequences with [...]

This project is based on a PIC10F200 baseline microcontroller, running from a supply voltage of 2 to 5 volts.  In standby mode it consumes a current of less than 1µA making it perfect for battery powered operation. It uses three individually driven high brightness LEDs, and a single push button switch for turning the light [...]

From the displayed patterns can be seen that the relays connected to the RB ports on the microcontroller and the RB3 – RB6.  Over MAX232 interface circuit is connected to the serial port of your PC. Command is done the program done in Visual Basic in the PC. Led6 uses LEDs for indication of incorrectly [...]

From the displayed patterns can be seen that the relays connected to the RB ports on the microcontroller and the RB0 – RB3. As the use TSOP1736 IR receiver or similar to it. Leadership is done remote control that supports the Philips RC5 standard. Source: Milan Milovanovic

This cheap and easy to build NiCd/NiMH Battery Charger is suitable for automatically charging a wide range of batteries for many applications. Proper chargers are usually expensive and cheap chargers supplied with the original equipment often incorrectly charge the cells and dramatically shorten their life. This ‘intelligent’ charger was designed for high current and rapid [...]

This post will show you how to make a thermometer that displays the temperature of the air. It’s not the most accurate thermometer in the world, but for this price and the fact that it was homemade… Source:DemonDomen

This is a automatic battery charger, after completing the charge it turns off automatically. It runs on AC power but you can also run it with DC power. Its not my idea or my invention, I got it from net. After understanding the circuit I built it and it works fine. So try to built [...]

This device plugs in-line with the PS2 port and hijacks key presses. When a username is typed in, it records the following password. Source: shawnlankton