By watching this video, you can understand PID in just 4 minutes. More explanation is given below on this website.
Understanding PID – [Link]
rsdio presents: 1-Wire network via an SPI-compatible display controller.
To produce the 3-wire SPI™ interface required by a MAX7221 display controller (active-low CS, DIN, and CLK), this 1-Wire network serially addresses three 1-Wire switches (DS2413). The first switch creates Chip Select directly (active-low CS), the second creates the serial-data line directly (DIN), and the third switch—with the help of three exclusive-OR gates—creates the serial clock (CLK).
App note: One-wire control of SPI peripherals – [Link]
Hi every one. Today i’ll show you how to make a PWM (pulse width modulation) out of a very famous chip 555 (lm,ne any one will do) with some other parts offcourse. This is really simple and it is very handy if you want to control your leds, light bulb, servo motor or dc motor (brushless also works). My pwm can only change the duty cyle from 10% to 90% it cant do nothing more!
Very simple PWM with 555 - [Link]
The project aims to build an optical access control device known as SecureLED which demonstrated the potential of communicating over cheap commodity LEDs. [via]
Better Access Control Known as SecureLED – [Link]
Solid State Relays are available almost everywhere these days, however they remain very expensive. Therefore, your efforts to build one yourself pays off. Especially since it only needs a handful components and the circuitry is simple and straightforward. A Solid State Relay is actually not a relay at all. There is no ‘relay’ present, just the electronics which does the switching. It works the same way as a relay; you can use a low voltage to switch a higher voltage or better.
Solid State Relay – [Link]
This project is a X-Y plate with a ball on top. The motors control the plate in such a way that the ball always remain on top. This includes controlling of servo motors and visual recognition of the ball using a web camera.
Ball on Plate Control – [Link]
Randy writes: [via]
I needed a foot switch for my DSLR camera so that I could take hands-free pictures. On a long-shot, I went down to the local Radioshack to see if they had one. As expected, they didn’t have any camera foot switches, but I did luck out that they had all the parts necessary to build my own. Here is how to throw together a 5-minute camera foot switch with easily obtainable parts from Radioshack.
5-Minute Camera Foot Switch – [Link]
This must be the smallest TV-B-Gone implementation, a device that can switch off almost any TV set. µTVBG is small enough to fit in your pocket and it is based on the ATTINY85 implementation by Lady Ada. All parts are SMT 0603 parts, the transistors are the good old BC850C and as IR diodes the author used the Osram SFH 4600.
uTVBG – World Smallest TV-B-Gone clone - [Link]