Month: May 2015

555 Timer Projects

Why did I order twenty 555 bipolar timers? Because they were $5.97 with free shipping. Now what do I do with them? Monostable mode: in this mode, the 555 functions as a “one-shot”. Applications include timers, missing pulse detection, bounce free switches, touch switches, frequency divider, capacitance measurement, pulse-width modulation (PWM) etc Astable – free …

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Measuring Voltage with an Arduino and an External AREF

The Arduino Uno has 6 analog inputs, designed for measuring a voltage. Other versions of the Arduino can have several more. Voltages are analog, meaning they can have a range of values, versus digital, which only has two, on or off. Whether you are reading a potentiometer, a TMP36 or LM35 temperature sensor, or even …

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