27 December 2010

LCD and contrast (HD44780)

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I want to issue a word of caution about the contrast pin wiring on HD44780 compatible liquid crystal displays. All my diagrams show the cont...
10 December 2010

Cellphone remote control, just an idea

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A very close family member has asked me how it would be possible to switch on (electric) heating in a remote location. Through a phone call...
29 November 2010

The Joule-Doh night light

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W hat do you get if you take a joule-thief and put it inside a play-doh can? A yellow "Joule-Doh" light! (or a "Play-Thief...
12 November 2010

TTL oscillator as NE602 external source

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T here are lazy moments in everyone 's life when you want to drive the NE602 LO input with a TTL - generated signal . I had a...
08 November 2010

FT817 external display, video instructions (it)

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T oday I think that there is no better way than a video to show a product's features, and to get some feedback about it. So I produced 5...
05 November 2010

External display for transverter, diagram

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Here is the schematic diagram for the external display based on ATmega168 (or mega48 or mega88 or mega328). Click to enlarge: The component ...
03 November 2010

FT817 external display, revised

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T he external display firmware for ATmega48/88/168 chips is ready for a public beta. I have kept a two-button user control interface and cha...
26 October 2010

FT817 external display architecture

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ATtiny or ATmega for the External Display? This is the question! After I have fought with the tiny2313 to fit all requested features for th...