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For the term "led runing ckt using 555 timer ic".

Arduino: Ultrasonic Rangefinder Using Parallax Ping and LCD

Here’s a little Ultrasonic Ranger using the Parallax brand Ping ultrasonic transducer pair and the Parallax LCD display. Both are easy to use with the Arduino system. Just don’t try to supply more than…

Arduino: Improved Resolution Ultrasonic Ranger Using Parallax Ping Transducer

I changed the code a little bit to show the resolution of the ultrasonic ranging method used by the Arduino/Ping combination. I think that the resolution is about 1-2 mm at the distance I…

Electric OU: Using the Link DSO 2102m on the Ainslie NERD Circuit, PART 1

This is a demonstration of the Link DSO 2102m Digital Sampling Oscilloscope, a PC-based 2 channel scope from 1997 era. The scope uses the ThinkPad 600e’s parallel port for communication and control and puts…