Schematics / Random
Tiny Robot
Recently many kind of robot contests have being opened and some interesting reports of the challenge are found on the web. The Line Following is a kind of the robot contests to vie running speed on the line....
Ultrasonic Rangefinder
An ultrasonic, or sonar, range finder is a common sensor in robotic systems and industrial environments. Even home and automotive uses are possible....
An MPS430-based Ultrasonic Rangefinder 
This application report describes a distance-measuring system based on ultrasonic sound utilizing the MSP430F413 ultralow-power microcontroller....
ESD Gun
Here's a circuit from EDN that lets you build your Electrostatic Discharge Gun! Use it wisely......
Simple PIC16F84 Programmer
Here's a simple circuit that will allow you to program the popular PIC16F84 microprocessor from Microchip. It's so small, it will fit inside the shell of a DB25 connector....
Bipolar Stepper Motor Controller
Here's a little circuit that simplifies interfacing to bipolar stepper motors. It's similar to a common unipolar design available on the internet. However, I modified it to use a pair of MOSFET-based H-bridges....
PIC-based Motor Controller
On these pages, I will introduce a control circuit for stepper motor. The software of this project is adapted to Embedded Systems(Lab13) for 2002 of Cleveland State University....