my recent reads..

LEAP#338 Going GlowBall!

The Glass Eye Studio “Celestial Super Nova” is quite an awesome piece of glass work … I have no idea how these can be manufactured in any quantity with consistency! Perhaps I should find a class? Glass work seems all the rage these days!

You can buy a base with lighting effects, but where is the fun in that? Here’s a project to make a base for the glass ball. Because it is going to sit on a desk, I decided to combine two functions:

  • a multi-colour “glow” effect to light the ball
  • or switch to power a 3528 LED strip (1m, 60 LEDs, 12V, cold white)

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub

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Here’s is a video with a few soothing minutes of the glow effect;-) …


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LEAP#337 RGB LED Glow with Opamps

For a while I’ve been thinking of ways to generate a pseudo-random rainbow glow on a composite RBG LED. In particular, while avoiding just throwing a microprocessor at the problem! I finally settled on three independent opamp-based triangle wave generators that have a nice drifting phase offset. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


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LEAP#336 Comparator-based Relaxation Oscillator

A quick test of a classic comparator-based relaxation oscillator, modified for single-supply LM358 OpAmp. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


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LEAP#335 MCP2200 LED Chaser (just because)

The MCP2200 USB-UART transceiver has 8 GPIO pins. Yes, you read that correctly. With such unexpected I/O capabilities, I feel obliged to do the only responsible thing: blink LEDs. Seven LED outputs and one input for a push-button to control direction of the “chase” sequence. As simple C program using the hidapi and we’re done! As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


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