Here are some useful articles on electronics and microcontrollers.
Digital I/O expansion methods.
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"Arduino Software Guide"
Chemical concentration controller : How to detect and control chemical concentration in a solution using an electronic circuit.
A PIC Ultrasonic Distance meter project using a PIC microcontroller which is ideal since it has a capture timer that can accurately measure the ultrasonic echo time, so calculating the distance is eas…
Anti Theft Tag Detector Circuit - Invented far eariler than you thought!
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