dangerousprototypes.com writes: [via]
What’s in a name? David L. Jones of EEVBlog thinks he’s found an Easter egg in the performance characteristics of the 555 timer chip which reveals the basis of the “555″ in its name. Build his circuit (schematic at video 13:25), fire up the scope and see if you agree!
555 timer Easter egg? - [Link]
The USGS maintains a server online that consolidates all the seismic data received from sensors all around the world. Terremoto uses an LPC Expresso board and an XPORT AR ethernet module to query the USGS server for a list of earthquake activity. When a new earthquake is received by Terremoto, tones are generated that correlate with the magnitude of the earthquake.
Terremoto – Earthquake Sounder based on the 555 Timer – [Link]
One of the applications of 555 timers is a class D amplifier. In its most simplistic form it can be built with a single 555 and the 200mA current capability is enough to drive a small speaker, making it a good replacement for a low power amplifier. But I wanted more; I wanted to use it to build an amplifier that had enough power to allow listening to music in a small room. Adding a high power stage to a classical 555 class D amplifier was too easy, so I decided to build my own high power 555.
555 class D amplifier - [Link]
In this Countdown Timer project, a 555 IC, a counter IC and a transistor switch to activate a relay either ON/OFF(mode selected by a jumper) as soon as the counting period is over. The circuit consists of an oscillator, a ripple counter and two switching transistors.
Simple Count Down timer Project – [Link]
A matrix keypad uses rows and column arrangement of keys to reduce the required number of I/O pins for interfacing with a microcontroller. This article shows how you can use a 555 Timer IC to interface a keypad with just 2 connections. The 555 timer is configured in astable multivibrator where the output frequency changes with each key press. Based on how many times the Timer module overflows, the information about the pressed key is determined.
2-Wire Keypad Interface with a 555 Timer – [Link]
The story of the triple nickel. Jeri writes – [via]
In this video I go over some of the history of the www.555contest.com and how it grew from a few random events. I also demonstrate an AM transmitter that broadcasts tones depending on the temperature of a thermistor.
The Story of the 555 contest and Temperature to Tone Transmitter – [Link]
All AVR microcontrollers have internal watchdog timer that can be successfully used in your projects. Atmega328 and other modern AVR microcontrollers have so called Enhanced Watchdog Timer (WDT). It has few very useful features including: separate 128kHz clock source, ability to reset microcontroller and generate interrupt.
Using watchdog timer in your projects - [Link]
There is a 555 contest happening that was conceived by Jeri Ellsworth and Chris Gammell. Check it out. [via]
This contest came about in mid-January 2011 on Twitter. Jeri began talking about 555 timers and excitement built up enough to start doing something about it! The organizers of the contest have no monetary interest, only interest in seeing new designs and creativity blossom. Vendors/sponsors did not prompt this contest, though they are helping organize and providing prizes. Really we’re just looking to have fun and see new designs, so be sure to submit yours!
555 contest up and running – [Link]
Jimmy Proton writes:
In this instructable i will teach you every thing you would ever need to know about the 555 timer IC. If you already know about the chip you could check out my slide show titled “47 projects to do with a 555” it will teach you every basic project to use a 555 with, its great for beginners!
Learn about the 555 – [Link]