Category Archives: 555

Music Reading for Machines

“Dammit Jim, I’m a hacker, not a musician!”, to paraphrase McCoy Scotty from the original Star Trek series. Well, some of us are also musicians, some, like me, are also hack-musicians, and some wouldn’t know a whole note from a treble clef. But every now and then the music you want is in the form of sheet music and you need to convert that to something your hack can play. If you’re lucky, you can find software that will read the sheet music for you and spit out a MIDI or WAV file. Or, as with my hand-cranked music player, …read more

Continue reading

Posted in 555, 555 timer, Hackaday Columns, music, music player, musical hacks, optical recognition, sheet music, Skills | Leave a comment

The Best of Both Worlds: Arduino + 555 Should Confuse Commenters

Hardly a week goes by that some Hackaday post doesn’t elicit one of the following comments:

That’s stupid! Why use an Arduino when you could do the same thing with a 555?

And:

That’s stupid! Why use a bunch of parts when you can use an Arduino?

However, we rarely see those two comments on the same post. Until now. [ZHut] managed to bring these two worlds together by presenting how to make an Arduino blink an LED in conjunction with a 555 timer. We know, we know. It is hard to decide how to comment about this. You can …read more

Continue reading

Posted in 555, arduino, Arduino Hacks, led, led blinker, led flasher | Leave a comment

About Schmitt (Triggers)

There is an old saying: “In theory, theory and practice are the same. In practice, they are not.” We spend our time drawing on paper or a computer screen, perfect wires, ideal resistors, and flawless waveforms. Alas, the real world is not so kind. Components have all kinds of nasty parasitic effects and no signal looks like it does in the pages of a text book.

Consider the following problem. You have a sine wave input coming in that varies between 0 V and 5 V. You want to convert it to a square wave that is high when the …read more

Continue reading

Posted in 555, Engineering, falstad, Hackaday Columns, hysteresis, op-amp, opamp, schmitt trigger | Leave a comment

Modified Baby Monitor Interrupts Your Groove in Case of Emergency

You try to be good, but the temptation to drown out the noise of parenthood with some great tunes is just too much to resist. The music washes over you, bringing you back to simpler times. But alas, once you plug in the kids started running amok, and now the house is on fire and there’s the cleaning up to do and all that paperwork. Maybe you should have tried modifying a baby monitor to interrupt your music in case of emergency?

Starting with an off-the-shelf baby monitor, [Ben Heck] takes us through the design goals and does a quick …read more

Continue reading

Posted in 555, ADG436, audio, baby monitor, headphones, home hacks, misc hacks, one-shot | Leave a comment

Semi-automatic Mouse Requires No Permit

When [Kerry]’s son asked him if there was a way to make a mouse click rapidly, he knew he could take the easy way and just do it in software. But what’s the fun in that? In a sense, it’s just as easy to do it with hardware—all you have to do is find a way to change the voltage in order to simulate mouse clicks.

[Kerry] decided to use the venerable 555 timer as an astable oscillator. He wired a momentary button in parallel with the left mouse button. A 50k mini pot used as the discharge resistor allows …read more

Continue reading

Posted in 555, 555 timer, Computer Hacks, optical mouse, rapid fire | Leave a comment

Primer on Servos Hits All the Basics

Servos are pretty basic fare for the seasoned hacker. But everyone has to start somewhere, and there’s sure to be someone who’ll benefit from this primer on servo internals. Who knows – maybe even the old hands will pick up something from a fresh perspective.

[GreatScott!] has been building a comprehensive library of basic electronics videos over the last few years that covers everything from using a multimeter to programming an Arduino. The last two installments delve into the electromechanical realm with a treatment of stepper motors along with the servo video below. He covers the essentials of the modern …read more

Continue reading

Posted in 555, arduino, classic hacks, continuous rotation, misc hacks, pwm, servo | Leave a comment