It would be perfectly reasonable to sell these, or kits, or partial kits. You could even sell the design/code, either to DIYers or to somebody like 'Spirit of St. Louis' (Look them up: linkage is disableized here).
I have several of their things, and they're cool, except a little flimsy (the paper scale on the pop-up dial for the alarm-clock peels, and the bank of mechanically-linked switches [and the antenna] is broken on the CD Boom Box). But the 'Field Telephone' is the only reason I still have a land-line.
Well, if you're going to use an audio format (mp3 etc) you could STILL use the box. Just use something like a tack hammer and record the sound. I suspect some of the other (eerie) effects can be found on the internet in appropriate formats. Some folks use these for ring tones!
@Tloose: Use a solenoid to strike the inside of the wooden box to make an authentic sound...
That's not a bad idea -- but I also want to have other sounds, like on the hour the sound of (rusty) clockwork graunching and straining and then letting loose with a release sound as the hour meter flips over to the next hour...
@Clarke: ...Do you have the voltage and current specs for each? I imagine they'll require more power than a microcontroller output could provide...
That's one of the problems in that you usually can't find any documentation for the meters. Also you often end up modifying them by removing shunt or series resistors. Also you have to be careful measuring the internal resistance -- in some cases you can "blow up" the meter using (trying to use) a multimeter to determine the resistance.
In some cases like a meter that's geared to to measuring say 10mA max, you could drive this directly from the MCU output -- but you also have to remember that the meter itself can generate negative voltages due to reverse/back EMF. Personally, I prefer to use the MCU output to drive a transistorm and have the transistor drive the meter -- all of this will be covered in my forthcoming blog.
NASA's Orion Flight Software Production Systems Manager Darrel G. Raines joins Planet Analog Editor Steve Taranovich and Embedded.com Editor Max Maxfield to talk about embedded flight software used in Orion Spacecraft, part of NASA's Mars mission. Live radio show and live chat. Get your questions ready.
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