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Old 01-15-2014, 06:04 AM #1
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Default Have 2 new RGB projectors with 30K galvos ILDA

Hello, it's been a while since I've posted. I have 2 new RGB projectors with galvos and ILDA DB-25 port. I am a programmer and just want to code some simple cirlces, squares, etc using an Arduino Uno USB board.

I just need a way I can write computer code to control about 3 or 5 +/-5VDC ILDA pins.

I found this online - very cheap way to make a controller...

Anyone have experience with this stuff?

- Paul

---------------------------------------

LINK: Laser X-Y-Axis control - Arduino Forum


Use any single-supply op-amp (I used the LM324 from rat shack as I had it lying around... overkill as I'm not using 3 of the op-amps)
and hook it up in voltage following mode:

INV1OUT (pin 1): Galvo control wire
INV1- (pin 2): wire directly to INV1OUT
INV+ (pin3): connect to arduino pin 9
Vcc (pin4): +5V
GND (pin11): GND

You really ought to add a signal-levelling cap between GND and INV+ pins, as close to the chip as you can get it (soldered piggyback would be my preference)... but I got decent results with and without. With, your beams should look slightly sharper as the mirror won't wiggle with the PWM output. I'd use a small value as you don't want to filter out the high-end too much. For no good reason at all, I chose a small ceramic cap marked _22_ for mine.

I used galvos pulled from old supermarket scanners. There must be a million of those things lying around, you can always find them on ebay. They were made by Symbol Tech and are usually labelled as servos or some such... you can usually find them on eBay for around $30 as pulls from old equipment...

The galvo has a four-wire connector, Blue, Red, Yellow/white, Black.

I wrote Symbol a couple years ago to get info about the connector (there's zilch online in terms of official specs)... as I recall, it's max rating is 12V (I've read others quote 14V). You apply a bias current to the black/red wire pair, and a variable voltage to the other pair. The direction and magnitude of that voltage determines the mirror swing.

I connected Blue and Black to ground, Red to +5V, and Yellow/white to the INV1OUT pin.

Then analogWrite(9, value) should position the galvo!

Two big issues with the above:
a) the galvo is way underpowered for it's rating
b) the PWM on the arduino is timed ~ 490Hz by default

a) is solved by using a 9V adapter / battery to power your arduino, and feeding the motor off of it. To adjust the signal, connect Vcc of the op-amp to 9V instead of 5V, and add a Gain=1.8 to the op-amp. Basically, that means you need two resistors with a value ratio of 1 : 0.8. Connect the higher one from INV1- to GND, and replace the connection between INV1OUT and INV1- with the smaller resistor. Not sure how much value matters, but lower is probably better. The LM324 is current-limited to 40mA sink internally so you can't really fry your arduino with it, feel free to play around with the resistor values some. If you pick too high of a ratio, you'll get clipping at the extreme +/- end of the range.

b) requires a little timer hacking. The PWM timer on the arduino is adjustable... I used the following code to set mine fast enough:

Code:
#define TIMER_CLK_STOP 0x00 ///< Timer Stopped
#define TIMER_CLK_DIV1 0x01 ///< Timer clocked at F_CPU
#define TIMER_CLK_DIV8 0x02 ///< Timer clocked at F_CPU/8
#define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64
#define TIMER_CLK_DIV256 0x04 ///< Timer clocked at F_CPU/256
#define TIMER_CLK_DIV1024 0x05 ///< Timer clocked at F_CPU/1024
#define TIMER_PRESCALE_MASK 0x07 //Total guess at this value...
void setup() {
TCCR1B = (TCCR1B & ~TIMER_PRESCALE_MASK) | TIMER_CLK_DIV1;
}


These galvos are really non-ideal for graphics, but the work good for beam effects. They have a wicked non-linear response; my testing seems to indicate there's a lock-in zone around dead-center (with a LOT of wiggle on it!) and two dead zones on each side half-way to full deflection - your mileage may vary. Circuit tuning your op-amp with some basic filters will certainly help, too.


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Old 01-15-2014, 06:29 AM #2
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

What about this cheap "Ishow v2.3 laser software for laser light" with controller for $70

LINK: V2.3 Ishow laser software for laser light [Ishow] - $69.00 : SpaceLas Co., Ltd., online shop
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Old 01-15-2014, 03:10 PM #3
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Quote:
Originally Posted by paulzimm View Post
What about this cheap "Ishow v2.3 laser software for laser light" with controller for $70

LINK: V2.3 Ishow laser software for laser light [Ishow] - $69.00 : SpaceLas Co., Ltd., online shop
Ishow is quite terrible. Here's a better DAC for about the same price or cheaper: Sound card DAC tutorial
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Old 01-15-2014, 04:18 PM #4
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Quote:
Originally Posted by Grix View Post
Ishow is quite terrible. Here's a better DAC for about the same price or cheaper: Sound card DAC tutorial
I have one of those but I sold my SoundCard DAC a while ago - scroll down 3 posts:
Sound card DAC tutorial

I don't like the DAC option anymore because S-P-A-G-H-E-T-I is no longer being sold or supported.

Does anyone have any direct experience with Ishow?

Can I use it to draw simple beam-shows? I mainly want to use it to test the galvos out.

I have 3 sets galvos total and I need to generate simple shapes (ILDA test pattern maybe?) because the galvos/controllers were put together mis-matched.

* I found out later that each X or Y galvo is tuned and matched for its repective galvo controller. DUH ON ME!
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Old 01-15-2014, 06:35 PM #5
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Some great screen-shots of Ishow V2.3 here:
iShow 2.3 Laser Software Controller for animation laser show systems - Shenzhen Lanling Technology Co.,Ltd

Any input from someone who has tried this? I don't want to build another SoundCard DAC
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Old 01-15-2014, 07:24 PM #6
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

your best bet is to use an ether-dream dac:

Ether Dream

the software is open source and the API is documented.

Quote:
Originally Posted by paulzimm View Post
Hello, it's been a while since I've posted. I have 2 new RGB projectors with galvos and ILDA DB-25 port. I am a programmer and just want to code some simple cirlces, squares, etc using an Arduino Uno USB board.

I just need a way I can write computer code to control about 3 or 5 +/-5VDC ILDA pins.

I found this online - very cheap way to make a controller...

Anyone have experience with this stuff?

- Paul

---------------------------------------

LINK: Laser X-Y-Axis control - Arduino Forum


Use any single-supply op-amp (I used the LM324 from rat shack as I had it lying around... overkill as I'm not using 3 of the op-amps)
and hook it up in voltage following mode:

INV1OUT (pin 1): Galvo control wire
INV1- (pin 2): wire directly to INV1OUT
INV+ (pin3): connect to arduino pin 9
Vcc (pin4): +5V
GND (pin11): GND

You really ought to add a signal-levelling cap between GND and INV+ pins, as close to the chip as you can get it (soldered piggyback would be my preference)... but I got decent results with and without. With, your beams should look slightly sharper as the mirror won't wiggle with the PWM output. I'd use a small value as you don't want to filter out the high-end too much. For no good reason at all, I chose a small ceramic cap marked _22_ for mine.

I used galvos pulled from old supermarket scanners. There must be a million of those things lying around, you can always find them on ebay. They were made by Symbol Tech and are usually labelled as servos or some such... you can usually find them on eBay for around $30 as pulls from old equipment...

The galvo has a four-wire connector, Blue, Red, Yellow/white, Black.

I wrote Symbol a couple years ago to get info about the connector (there's zilch online in terms of official specs)... as I recall, it's max rating is 12V (I've read others quote 14V). You apply a bias current to the black/red wire pair, and a variable voltage to the other pair. The direction and magnitude of that voltage determines the mirror swing.

I connected Blue and Black to ground, Red to +5V, and Yellow/white to the INV1OUT pin.

Then analogWrite(9, value) should position the galvo!

Two big issues with the above:
a) the galvo is way underpowered for it's rating
b) the PWM on the arduino is timed ~ 490Hz by default

a) is solved by using a 9V adapter / battery to power your arduino, and feeding the motor off of it. To adjust the signal, connect Vcc of the op-amp to 9V instead of 5V, and add a Gain=1.8 to the op-amp. Basically, that means you need two resistors with a value ratio of 1 : 0.8. Connect the higher one from INV1- to GND, and replace the connection between INV1OUT and INV1- with the smaller resistor. Not sure how much value matters, but lower is probably better. The LM324 is current-limited to 40mA sink internally so you can't really fry your arduino with it, feel free to play around with the resistor values some. If you pick too high of a ratio, you'll get clipping at the extreme +/- end of the range.

b) requires a little timer hacking. The PWM timer on the arduino is adjustable... I used the following code to set mine fast enough:

Code:
#define TIMER_CLK_STOP 0x00 ///< Timer Stopped
#define TIMER_CLK_DIV1 0x01 ///< Timer clocked at F_CPU
#define TIMER_CLK_DIV8 0x02 ///< Timer clocked at F_CPU/8
#define TIMER_CLK_DIV64 0x03 ///< Timer clocked at F_CPU/64
#define TIMER_CLK_DIV256 0x04 ///< Timer clocked at F_CPU/256
#define TIMER_CLK_DIV1024 0x05 ///< Timer clocked at F_CPU/1024
#define TIMER_PRESCALE_MASK 0x07 //Total guess at this value...
void setup() {
TCCR1B = (TCCR1B & ~TIMER_PRESCALE_MASK) | TIMER_CLK_DIV1;
}


These galvos are really non-ideal for graphics, but the work good for beam effects. They have a wicked non-linear response; my testing seems to indicate there's a lock-in zone around dead-center (with a LOT of wiggle on it!) and two dead zones on each side half-way to full deflection - your mileage may vary. Circuit tuning your op-amp with some basic filters will certainly help, too.
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Old 01-15-2014, 08:03 PM #7
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Quote:
Originally Posted by swamidog View Post
your best bet is to use an ether-dream dac:

Ether Dream

The software is open source and the API is documented.
EXCELLENT - That is exactly what I am looking for. I am a computer programmer (Assembly, C++, PHP) by trade and I am interested in the API documentation. Any idea where I can download this? I just want the ability to draw some simple lines, circles, patterns synced up to music. Many thanks!
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Old 01-15-2014, 08:11 PM #8
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

the link i provided in my first post contains all the information you're looking for.

Ether Dream


Quote:
Originally Posted by paulzimm View Post
EXCELLENT - That is exactly what I am looking for. I am a computer programmer (Assembly, C++, PHP) by trade and I am interested in the API documentation. Any idea where I can download this? I just want the ability to draw some simple lines, circles, patterns synced up to music. Many thanks!
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Old 01-17-2014, 12:40 AM #9
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Welcome back Paul-- grand re-entrance i must say..
worthy of a +5 - for all that info- some i had been actually looking for but gave up.
if you need any I-shows lets me know- and i can still hook any member/friend up with QS or Beyond.
sorry i missed you last time in florida - MAY try to do FLEM mar 1st- always wanted to time a trip to see Dad when FLEM was on--but he has passed and I may not get back over there for some time.

Len

and GRIX is correct- its pretty lame- it does help me sell QS tho.. by default.lol

UN- 'Ash' here is a wiz at I-Show- PM him hes helpful.

over 'there' UN 'Agent-C' Casey (Austin/Temple tX) is writing his own soft and did a small demo for a few of us in Austin few weeks back-
he was controlling live wireless with a small tablet-
You should contact him-
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Old 01-17-2014, 01:43 AM #10
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Quote:
Originally Posted by hakzaw1 View Post
sorry i missed you last time in florida - MAY try to do FLEM mar 1st- always wanted to time a trip to see Dad when FLEM was on--but he has passed and I may not get back over there for some time.

Len
Long time no chat Len aka Hakzaw1 - sorry to hear about your father passing.

I now have 2 complete RGB (and one RRGB) ILDA 30K systems now but NO controllers lol!

Want to try out CHEAP Ishow v2.3 controller with some shows / patterns:
V2.3 Ishow laser software for laser light [Ishow] - $69.00 : SpaceLas Co., Ltd., online shop


* I bought out an old partner from a (failed) light show company we were starting. I have tons of other great laser/electronic goodies: variable benchtop power supplies, digital LCD solder station, galvos, optics, mounts, dichros, modwerx heat sink blocks, etc. Anyone looking to trade for some kind of cheap DB-25 ILDA controller?

FOR SALE - Email me at: paulzimm@gmail.com if interested...
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Old 01-17-2014, 04:28 AM #11
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

If you still want to try the microcontroller route, try getting a faster microcontroller than an Arduino unless you have the ARM variant (Arduino Due). The "DAC"s one the Arduino are really slow, low resolution, and even if they were fast the Arduino is pretty slow too. I'd at least use a Teensy 3.0 or something for your MCU and maybe even consider an SPI or I2C DAC for performance.
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Old 01-17-2014, 11:56 PM #12
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Get with me before letting any of those parts get away-
I DO have some item of interest to show you-
will be happy to 'lend' you I-Show ti play around with as long as you want.

hope to see you mar 1st at FLEM near Orlando- others are coming from there- share the ride!!

Miami Norm might go- I will PM him for you

Len
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Old 01-18-2014, 01:20 AM #13
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Would be awesome to go to FLEM - I may actually be able to make that this year!

PS - I sent Hak/len a bunch of photos of all this extra laser equipment I have for sale/trade. I could sure use temporarily Ishow to check my galvos. Thx!
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Old 01-23-2014, 03:03 AM #14
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

I would have sent it already IF I could just find the disc- as I am sure it has drivers on it you will need- MAYBE a I-Show owner will be so kind as to burn you a copy from theirs-- sending the owners manual now to you-- hak
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KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
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Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
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Old 01-23-2014, 06:29 PM #15
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

Quote:
Originally Posted by hakzaw1 View Post
I would have sent it already IF I could just find the disc- as I am sure it has drivers on it you will need- MAYBE a I-Show owner will be so kind as to burn you a copy from theirs-- sending the owners manual now to you-- hak
I notice in your sig you use 'Mamba Black(clone)' - where can I check that out? It uses the SoundCard DAC - right?

Thx!
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Old 01-24-2014, 08:51 PM #16
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Default Re: Have 2 new RGB projectors with 30K galvos ILDA

I got the mamba black clone and mini disc at SELEM 2011 IIRC- NEVER used it
I would like to see what you can do with it and may be able to get it to your quicker than the lass desireable i-show so yeah i can loan you my mamba-just get with me for best price on the best Pangolin or LSX both are wonderful- the problems some have learning LSX would not happen to you with your background. QS/BEYOND is so easy i even caught on pretty quick- but has lots to learn before I create my own original stuff. so.. yes to mamba and forget the i-show- PM coming with link to lasechat

Len
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QS/FB3 +Beyond-APC40-Mamba Black(clone) 5paghettix2 and I-show x2-Kasio synth-midi
KGB- 532 1.1W 445 2.2W 655 1.3W DT Pro 40 still needs more red.
KGB1W+ 532 DT Pro 40 soon to be GB.
Laserking 1300RGB FULL COLOR 30K(may be FS)
Laserking RGB LK PD2 500 and LK SD 850
REKE RGB 500- G 300
HeNes-(12)R(3)G-COH-594/5 mW-thnx DrSam
MULTILINE-147mW[
445nm 180mW-Mini spiro-Yob.
LPMs-RadiantAlpha& Pro5W-AixiZ SPER/KenmeterLite/LB1
Spacelas 1178mW 655nm/AixiZ 300mW532&
2 B&W 473nm 5/6mW lab
JETLRS1.3W&1.2W-MGL-H
638 180mW ttl mimi lab (av. 230mW)
405 100mW ttl mini lab
445 300 mW ttl mni lab ^AixiZ^ all for a lumia PJ
*MightyMite 2000* RGB all diode 2.2W 30K- 637/520./450...NEW!!
Guide DIY Pjs by Dan-
http://nqlasers.com/scannerreference/index.php?title=Main_Page
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