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17 Mar 2011

[Roteno's] submission for the 555 timer design contest is an Internet connected earthquake alert system. It monitors the USGS website for earthquake data and plays a tune when an earthquake occurs. [via]

Earthquake alert system – [Link]

11 Mar 2011

A music synthesizer is Frank’s entry to the 555 contest. He used a 555 timer to make a really cool synthesizer that is played with a stylus and has filtering and volume enveloping features. Various note frequencies are generated with precisely calculated resistances. [via]

555 Contest Entry: Music synthesizer – [Link]

11 Mar 2011

Jim Chen made a very interesting LED chasing game that uses six 556 timer chips. This is his second entry to the 555 contest which is recently closed. There are nine LEDs in the game. Any of them could glow randomly. The player has to turn off the LED by touching an electrode next to the LED. While the player continue playing the game the time available for the player is less and less. When you missed to turn off an LED within the provided time frame, the game is over. Here’s how the game works. [via]

555 Contest Entry: “Whack a Mole” style game – [Link]

11 Mar 2011

Direct conversion RF receivers are different from the standard superheterodyne one as they don’t have IF stage, and so the radio signals are directly converted into audio signals. This project uses 3 555 timer ICs as the only active devices to construct a direct-conversion radio receiver for the 80 meter amateur radio band. [via]

555 Contest Entry: Direct conversion RF receiver for 80 meter amateur band - [Link]

5 Mar 2011

Really impressed by the turnout for the 555 Contest… something like 238 entries! The above videos show three of the submissions. [via]

Jeri and I are hard at work thinning the pack to pass on to our hack-master judges by next week. And don’t worry, even if you didn’t make the first cut, you’ll still be eligible for some of the door prizes from our wonderful sponsors. We’ll be announcing those judges soon.

In the meantime, I wanted to highlight only a few of the amazing projects we’ve already seen. Why should the aggregator sites get all the fun? We’ll be posting links to all of the entries in the coming days, once the entries have advanced to the next round. Check out 3 videos Jeri and I thought were particularly fun and inventive.

555 Contest Entries Already Wowing the Organizers – [Link]

4 Mar 2011

Victor from Roteno Labs has built this Earthquake Sounder based on the 555 Timer called the Terremoto as a submission to the 555 Timer Contest. [via]

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]

2 Mar 2011

Makerdino shares his 555 Slider Synth: [via]

When it’s turned on by pressing SW1, the 555 astable oscillator is activated. It will produce a tone through the speaker that can be varied in pitch by changing the distance between the LED and the photo cell.

The 555 SliderSynth – [Link]

1 Mar 2011


Last day to enter the 555 timer contest! – [Link]

28 Feb 2011

electrobob.com writes:

You might find yourself needing a low power H bridge for driving a motor like I once did. The 555 IC can drive a load up to 200mA, source or sink, which might make is usable as a driver, if one can control the output as desired.

555 / 556 H bridge – [Link]

28 Feb 2011

electrobob.com writes:

A certain knock at the door may tell you if the person behind it is the one expected or just somebody else. Each knock on the door itself cannot tell you too much, it can be lighter or stronger and that’s all about it, there’s no information on pitch here. But a certain sequence of knocks can be an actual secret code. The secret knock is encoded in the actual timings of the knocks, the time between each knock creating a distinguished pattern.

Secret knock detector with 555 – [Link]





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