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The Essential Guide to the 74HC595; What it is and how you can easily use one in any of your projects.
Which pic programmer do you need? This page discusses PIC programmers and gives some essential information on choosing or building your own programmer.
learn how to use Arduino pulseIn and pulseInLong to get the most accurate pulse measurement on an Arduino.
How to use Arduino millis() for deylays but still make the processor do work - Stop using delay()
This MCP23017 Interrupt tutorial shows you how to connect interrupt outputs from several MCP23017s to a single microcontroller interrupt pin.
Arduino Delay() is a useful function but not for large programs - Find Out Why Here...