Arduino running hexagonal mirror from laser printer
♌ pez ♌
Here's a quick demo of running a hexagonal mirror scavenged from a laser printer. The chip that does the actual motor control is an LB11872.
The interface requires just one signal, the clock input. Varying the clock frequency controls the mirror rotation speed. There is also a start/stop signal that can be used (or you can ground that pin) and the controller provides a lock output to indicate when the mirror is spinning at the requested speed.
Here's some sample code. If you remove the delays, the motor spins at a frightening speed.
int ssPin = 2; // Start/Stop output at dgital pin 2
int lockPin = 3; // PLL locked input at digital pin 3
int clockPin = 4; // Rotation speed clock output at digital pin 4
int ledPin = 13; // Show "lock" on LED output
// The setup() method runs once, when the sketch starts
void setup() {
// initialize the digital pin as an output:
pinMode(ssPin, OUTPUT);
digitalWrite(ssPin, LOW);
pinMode(lockPin, INPUT);
pinMode(clockPin, OUTPUT);
digitalWrite(clockPin, LOW);
pinMode(ledPin , OUTPUT);
digitalWrite(ledPin, LOW);
}
// the loop() method runs over and over again,
// as long as the Arduino has power
void loop()
{
digitalWrite(clockPin, HIGH); // set the LED on
delay(1); // wait for a second
digitalWrite(clockPin, LOW); // set the LED off
delay(1); // wait for a second
}
Adam Kaufman
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Bryce Beamer
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pezman
about the mirrors in laser-printers!
Yeah, playing with lasers is something I'm usually up for ...
By the way, Surplus Shed seems to have something like this ...
http://www.surplusshed.com/pages/item/m2879.html
The beauty of this is that it's a remarkably powerful, small, variable
speed motor, so it's not limited to used as a laser mirror.
There are similar brushless DC motors and controllers in CD drives,
hard-disk drives, old floppy drives etc. -- all for the taking.
Jack Zylkin
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Jack Zylkin
usbtypewriter.com
Philadelphia, PA
pezman
you can write on phosphorescent surfaces. He made a frappus that is
like a dot-matrix printer that will print an icon on phosphorescent
fabric. His device uses several lasers, but with a rotating mirror,
it seems possible to do something similar with one laser (and make the
device small as well).
The same basic idea of using a mirror to sweep lasers can be used to
make laser POVs -- basically, you can paint dots on a wall by
carefully modulating an array of inexpensive lasers while their beams
are swept over a surface.
By using a hexagonal (or octagonal or whatever-gonal) mirror, you can
get a 100% duty cycle (i.e. the lasers are always pointing at some
portion of the target), so it improves the brightness of the display
-- at least in theory.
PJ was interested in using our bucket-o-semi-defunct lasers for some
purpose -- this might be ideal.
Also, just the basic idea of using readily available brushless DC
motor controllers has a lot of possibilities. The speed and power of
these little motors is really surprising, and you can salvage them
from hard-drives, CDs, laser printers, faxes etc. pretty readily. You
can even pick off a crude servo signal by reading the hall-effect
sensors, so closed-loop control is an option.