DIY dimmable clapper for all your lazy lighting needs

For the lazy man who can’t be bothered to buy a proper wattage lamp here’s the Clever Clapper, a Clapper that finally has the ability to dim the lights.

Like the clapper we saw last month, [Pete]‘s version uses an ATtiny2313 and an electret mic. What sets [Pete]‘s version apart from the vintage 80s model is the ability to dim the lights. Like any clapper, two hand claps within a second toggles the relay. Clapping three times within one second puts the lamp into fading mode. In this mode, the lights dim up and down with PWM until a fourth clap is detected.

[Pete] saw that the program memory in his ATtiny2313 wasn’t 100% full, so he added a few more capabilities. If you shine a laser onto his circuit, a relay trips and turns on a decorative moon lamp. There’s also a ‘lecture mode’ that feeds the microphone directly into the microcontroller to vary the PWM signal. The result is a light that brightens with more intense sound. Check that feature out after the break after the demo video of [Pete]‘s Clever Clapper.


  1. Mental2k says:

    I followed it fully up until the word “sadly” after that it’s all a bit wtf!

  2. Per Jensen says:

    And that´s “Electret”….

  3. N0LKK says:

    I like the old school way of including art work in a video, we saw in the first video. I like the lecture mode as an alternative way to building a light organ. Used explore to save Pete’s blog as a mht file. I wish Firefox has a similar way to say to save a web page as a single file.

  4. zokier says:

    He is doing PWM with a relay? Sounds bit odd imho..

  5. That is an excellent device. Very well made and very aesthetically pleasing. Thanks for posting!

  6. fartface says:

    Why does the summary contain the word “relay” when the circuit it’s self does not even use one?

    • Steve-O-Rama says:

      It does use a relay. Follow pin 8 (T0/PD4) from the micro-controller; you’ll see it’s attached to a series resistor, and then a 2N3904, to switch the coil current of the relay.

  7. Steve-O-Rama says:

    I kinda rolled my eyes after seeing so many dollar signs on the EAGLE schematic. It’s mostly an aesthetic thing, I know (but don’t even get me started on AdaFruit schematics…).

    Another item of concern: TIP120, which are Darlington-configured bipolar NPNs. Aren’t those a bit antiquated? I’d think using some good logic-level MOSFETs (or maybe even a MOSFET driver if you really wanna drive ‘em hard) would be much better in terms of power dissipation and current handling capabilities.

    Other than that, not too shabby. I dig the simplicity of the LPF used. :)

    Note: I tried an XHTML tag in my message, so if it didn’t work, please don’t crucify me.

  8. shubhankar says:

    can’t i use tip122 instead of tip 120?

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