Category Archives: Electronics

Temperature Differential sensor

Posted on June 20, 2010 by jimbo

I plan to construct an Arduino circuit which will read two temperature sensors, and turn on a relay if the differential gets too large. This is eventually to be pressed into service on the dew heaters for the telescope. But … Continue reading →

Posted in Electronics, Making | Tagged Arduino, MOSFET, Relay | Leave a comment

hardware RNG

Posted on December 8, 2009 by jimbo

Seems like you should be able to pull truly random numbers out of a hardware circuit. Tune into the CMB or some other kind of noisy circuit, sample it, and voila, all the random you can eat. hm. Needs thought.

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360 controller as mouse

Posted on February 6, 2009 by jimbo

360 Controller as mouse

Posted in Electronics, Videogames | Leave a comment

keypad to PIC using only one pin

Posted on September 12, 2008 by jimbo

http://www.edn.com/article/469869-Single_wire_keypad_interface_frees_microcontroller_I_O_pins.php

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555 metronome circuits

Posted on September 12, 2008 by jimbo

http://www.edn.com/article/CA46074.html http://www.ecelab.com/circuit-metronome.htm

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What was I trying to build?

Posted on August 26, 2008 by jimbo

I was going through an old project notebook, and ran into the following entry: “I’ve been trying to figure out how to build avoltage attenuator for a couple of years, and my current brain exercise is to make a circuit … Continue reading →