{"id":55,"date":"2007-05-19T15:51:45","date_gmt":"2007-05-19T15:51:45","guid":{"rendered":"http:\/\/www.pyrofersprojects.com\/blog\/?p=55"},"modified":"2011-10-30T12:04:36","modified_gmt":"2011-10-30T12:04:36","slug":"xy-laser-pointer-controller","status":"publish","type":"post","link":"https:\/\/www.pyrofersprojects.com\/blog\/xy-laser-pointer-controller\/","title":{"rendered":"X\/Y Laser pointer controller"},"content":{"rendered":"

\"PIC
\nA long time ago I decided to build a controller that would direct a laser pointer, The idea was to have 2 speakers connected to mirrors so they deflect in the x\/y range. This allows the laser to be aimed around at will.<\/p>\n

A simple Pic 16f84 was the controller with an analog devices Dual DAC. The dac has a lock on the output so both x and y get updated at the same time. The pic simply loads an 8bit data value for x, then y, then updates the DAC output.<\/p>\n

<\/p>\n

I originaly had some nice Mirror galvanometers from an old laserdisk player to aim the beam, these were a lot better than speakers, however they are not easily accessable for most people. The output of the DAC was centered at 2.5v with a 2.5v swing each way from the 5v supply. This gives a nice AC output from -2.5v to 2.5v relative to the output \u2018gnd\u2019 Great for connecting into cheap audio amps for driving the mirror speakers.<\/p>\n

The hard part is firmware on the pic. My original plan was to make writing, but this is quite a complex task. I managed to get a box, a circle, triangle etc but am still working on drawing complex shapes. A third Z axis was provided in the form of a digital out from the pic to turn the laser on\/off. This allows seperation of drawn objects.<\/p>\n

I have a couple of games planned, first is pong, the 3 shapes needed here are simple and should be easy to draw. Then asteroids. A lot more complex.<\/p>\n

The final game should be a small handheld box that projects a laser \u2018vector\u2019 game onto any surface. Obviously the power of the laser changes how visible the game is under different conditions.<\/p>\n

\"Component \"Copper \"PIC \"Square\"
\nThis was the first PCB I ever made, it was printed by laser printer onto tranparency, UV exposed onto pre-etch resist coated board and acid etched.<\/p>\n

Here is the initial CC5X code, its pretty basic though,<\/p>\n

#pragma chip PIC16C84
\n#pragma config WDTE=off, FOSC=XT, PWRTE=on<\/p>\n

\/\/ #pragma config &= 0x3FF9<\/p>\n

#include \u201cdelay.c\u201d<\/p>\n

\/* IO-CONFIGURATION: *\/
\n#define Konfig_portA 0x08 \/* xxxx 1000, 1=INPUT *\/
\n#define Init_portA 0x00 \/* 0000 0000 bits 1,2 are dac control, 4 is laser and 8 is input*\/<\/p>\n

#define Konfig_portB 0x00 \/* 0000 0000, 0=Output *\/
\n#define Init_portB 0x00 \/* 0000 0000 All 8 bits output to send data to Dacs*\/
\n#define UPDATE 0x00 \/* LDAC and DACAB are inverted *\/
\n#define FREEZE 0x01 \/* So 0 in update makes the DAC update *\/
\n#define DACX 0x00 \/* and 1 makes it freeze its current data *\/
\n#define DACY 0x01 \/* Just some friendly names for the dacs *\/<\/p>\n

#pragma bit LDAC @ PORTA.0
\n#pragma bit DACAB @ PORTA.1
\n#pragma bit LASER @ PORTA.2
\n#pragma bit INPIN @ PORTA.3<\/p>\n

#pragma bit PIN1 @ PORTB.0
\n#pragma bit PIN2 @ PORTB.1
\n#pragma bit PIN3 @ PORTB.2
\n#pragma bit PIN4 @ PORTB.3
\n#pragma bit PIN5 @ PORTB.4
\n#pragma bit PIN6 @ PORTB.5
\n#pragma bit PIN7 @ PORTB.6
\n#pragma bit PIN8 @ PORTB.7<\/p>\n

void main ( void)
\n{
\nunsigned x,y,t;
\n\/* initialize *\/
\nPORTA = Init_portA;
\nTRISA = Konfig_portA;
\nPORTB = Init_portB;
\nTRISB = Konfig_portB;<\/p>\n

x=0;
\ny=0;<\/p>\n

DACAB = DACX;
\nLDAC = FREEZE;<\/p>\n

while (1)
\n{
\nDACAB = DACX; \/* The dac seems to work a lot faster than the PIC so no delay is needed *\/
\nPORTB = x; \/* but that is based on ititial slow work observations *\/
\nDACAB = DACY; \/* Although Both dacs appear to change independantly ok with this *\/
\nPORTB = y; \/* even though there is no delay *\/
\nLDAC = UPDATE; \/* The rest of the program provides a delay while dacs settle! *\/
\nLDAC = FREEZE; \/* The dacs update now, while the prog does its work *\/<\/p>\n

if (x==255) y\u2013; \/* If at right, go down *\/
\nif (y==255) x++; \/* if at bottom go left *\/
\nif (x==0) y++; \/* If at left, go up *\/
\nif (y==0) x\u2013; \/* if at top, go right *\/
\n\/* delay(2); *\/
\n}
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"

A long time ago I decided to build a controller that would direct a laser pointer, The idea was to have 2 speakers connected to mirrors so they deflect in the x\/y range. This allows the laser to be aimed around at will. A simple Pic 16f84 was the controller with an analog devices Dual […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/posts\/55","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/comments?post=55"}],"version-history":[{"count":1,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/posts\/55\/revisions"}],"predecessor-version":[{"id":361,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/posts\/55\/revisions\/361"}],"wp:attachment":[{"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/media?parent=55"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/categories?post=55"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pyrofersprojects.com\/blog\/wp-json\/wp\/v2\/tags?post=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}