555 Timer Monostable Multivibrator Circuit

This  is a side project from my endeavor to program an Arduino Uno wirelessly (over Bluetooth) using a cheap HC06 JY-MCU Blueetooth Module I got from eBay. In order to kick off the Arduino bootloader and upload a new sketch, you need to reset the Arduino at the right moment, and hold the reset pin "LOW" for the right duration, or else things can go bad. Eventually I found out a circuit that does exactly what I wanted and, as a bonus, has a cool name: a "monostable multivibrator". I feel smarter just typing that!…continue reading →