Category Archives: LED

Household thermal imaging

I am now the proud owner of a Seek Thermal infrared camera!  Let’s play a game: it’s called “guess the subject of this photo”!

Taken with SM-G920T, Android 5.0.2 Continue reading

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Upgrade halogen->LED

We have two 300W halogen flood lamps in the house, but I decided it was time for an LED upgrade.  I selected the Cree 18W (90W equivalent) flood lamp as the replacement.  I wanted to keep the 6ft tall lamp stand and dimmer, but remove the halogen housing, thermal runaway circuit and reflectors.

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Pitch to Color

Here is the color wheel used by my electronic instrument, Abella. When the music box is playing “C”, the pitch display appears yellow. Middle “C” is set at 262 Hz, high “C” at 523, and low “C” at 131 Hz, and each is displayed yellow. The remaining notes occupy a RGB-CMY color space.

DSC02514 Continue reading

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Shift registers and Voltage display

I’ve been having great fun with the Arduino Uno microcontroller board.  Here I’ve got the Arduino using a shift register to light up a 7-segment display output.

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Introducing Abella

Sound and light!

abella1

http://www.youtube.com/watch?v=ccJRsY-8vOs

Here is some footage from early hardware development of “Abella,” my Arduino-powered electronic instrument. Yes, it is in a shoebox, and yes, the control knobs are popped through the cardboard. Continue reading

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USB car charger, 2A

The more I’ve learned about switch-mode power supplies, the more amazing it seems to me.  So a voltage source across a wide range of values can be converted into another voltage, just by pulsing current though an inductor.  Of course, switch-mode power supplies are even easier to set up with ICs like this one:

IC REG BUCK BOOST, 296-17764-5-ND

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Cree XM-L Color

This one is truly a beauty.  Here is the new RGBW high-power LED from Cree.

XLAMP XM-L COLOR LED RGBW (XMLCTW-A0-0000-00C3ABB02CT-ND)

20130514_212054 Continue reading

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