Laserprojector en

Kran	Diese Seite befindet sich noch im Aufbau bzw. wird gerade heftig überarbeitet. Vorsicht: Herumliegende Gedankenfetzen! Dieser Banner ist hier dokumentiert.

Deutsche Version

     

laserprojector Release status: experimental [box doku]
Description	projector using laser and 2 mirrors for deflection
Author(s)	siro
Last Version	0.2

DIY Laser Projector

Concept : Build a laserprojector as easy as possible

Übersicht

Max. Resolution:256x256
Refreshrate:30Hz
Colors:1 (blau)
Colordepth: 256 (8-bit)
Interfaces: RS232, ??
Reflectionunits:2x Mirrorwheels, Asyncronmotor + DC-motor
used Controllers:ATmega169 + STM3210xx

Basic Idea

An Atmega controlls 2 fast motors, checks keyboard input,controls GLCD and Power-Supply.
On each motor is a mirror-disk spinning to deflect the laserlight.The first mirror deflects the light only in the horizontal layer, the second one deflects light on the vertical layer. I'm going to modulate the laser diode to draw images.

Syncronisationunit:

obsolete
Detects position of the laserbeam [eagle Dateien im labor-svn]
Better use a impedanceconveter, instead of voltage divieder.

• 

  schematics of syncronisationunit

• 

  SMD-Board of syncronisationunit

Description

TODO Die LEDs leuchten auf den Spiegel, wodurch das reflektierte Licht auf die Photodioden fällt (nicht kritisch welche), wird differenziert, rauschgefiltert und verstärkt. Am Ausgang des OpAmp schneidet eine Diode die negative Spannung ab. Ist diese groß genug, schaltet der FET (BSS123) durch und zieht die Output Leitung auf Masse. Am anderen Ende der Leitung muss ein Pullup-Widerstand sein, der den Strom auf unter 100mA begrenzt. Versorgungsspannung: 3,7 bis 15 Volt (empfohlen 5 bis 12 Volt).

Syncsensor

Two small IR-LEDs are emitting light onto the spinning mirrors. The deflected light changes the current at the "fototransistor".

Saftyunit

obsolete
The Saftyunit has to detect, that both mirrors are spinning fast enough, to prevent damage to anything in the laserbeam. The saftyunit cuts the laser power as soon as anything shows abnormal behavior.This is a class 3 laser, able to burn wood/paper/flesh even in a few meters distance !

Controlunit

Connected to the controlunit are GLCD, Keyboard, Horizontal-Motor, powersupply, i2C

• 

  schematics of Controlboard

• 

  layout of Controlboard

Horizontal mirror

I received a "Laserunit" out of an Epson printer doing 24000 rpm with 7 mirroring sites. 24000*7/60 = 2800 deflections per second.

Connector

Pin Funktion
1 +24V
2 GND
3 Input: 5V TTL 0Khz = 0 U/s, 1 Khz = 400U/s (non-linear scalling)
4 Output: 7*U/sek ??? instable output, from hall, don't use it!
5  ??

• 

  Laserunit of an Epson printer

• 

  laserprinter mirror front top view label: FL-EGP3901

• 

  laserprinter mirror back top view Controler: AN44000A label: YG-F1G 36

• 

  laserprinter mirror back view label: MASQ7DF19LM DC24V 23304min⁻1 2234ZA3 PbF

Lasersupplyunit

This circuit is able to regulate the current going trough the laserdiode. Its able to modulate the beam up to 1Mhz with a 0/3,3V input signal. The output is a rectangle modulated current with an adjustable offset and max. current. An OpAmp is missing in this circuit.

• 

  schematic of lasersupplyunit

Imageconversionunit

TODO

Laserdiode

WARNING !
This is a class 3 laser, able to burn wood/paper/flesh even in a few meters distance !
Wear security goggles !
I'm using this laser to project an image at a very big surfaces ! This prevents serious eye damage when looking at the projected point!
Do not look into the beam!
1000mW (1W) Laserdiode 445nm blue 5,6mm

TODO

• Redoing the whole concept
• Design SMD boards
• Buy new motors, mirrors, laser,...

Links

Laser Projektoren

Laser-Projektor selbstgebaut

http://elm-chan.org/works/vlp/report_e.html

Horizontal Laser Deflector

AVR Laser Projector

AVR laser projector

the laserbeamer

Laser video projector

Mechanically scanned laser display

RGB Laser Projector