Hi Art,
I don't know if this should be here or somewhere else. You have posted a 2.5D cut of the celtic knot done with your laser. Is it or will be be possible to generate gCode for a CNC machine to do the same cut?
I have been playing around with "knots" in Gearotic and can generate a dxf but it is just lines and has no z in it and the gCode doesn't seem to work for me.
John
Arduino based Laser Control
Re: Arduino based Laser Control
1% inspiration 99% try, try again
Re: Arduino based Laser Control
John:
It will, hopefully by the end of the year. Celtic knots currently can only be output as STL's
and grey scale photos ( which the laser uses.). The problem is we have never had a GCode
module that can do engravings, or full 3d machining, gears are all 2.5D. SO the new
machining module will get the capability in the end to do 3d engraving, which is how bevels
and celtic knots will be done.
Im not sure the order as yet, I suspect 2.5D will be redone to be much more powerfull, then
4th axis will be done with a simulator, then 3d engraving will be added as the last step. As of now
thats the plan for this year. Shoudl I finish early, then Ill be adding some more mechanisms or
calculators such as planetary calculators.
2.5D recoding is almost done, it will probably be released in October, we'll go from there as quickly
as I can in the above order.
Thx
Art
It will, hopefully by the end of the year. Celtic knots currently can only be output as STL's
and grey scale photos ( which the laser uses.). The problem is we have never had a GCode
module that can do engravings, or full 3d machining, gears are all 2.5D. SO the new
machining module will get the capability in the end to do 3d engraving, which is how bevels
and celtic knots will be done.
Im not sure the order as yet, I suspect 2.5D will be redone to be much more powerfull, then
4th axis will be done with a simulator, then 3d engraving will be added as the last step. As of now
thats the plan for this year. Shoudl I finish early, then Ill be adding some more mechanisms or
calculators such as planetary calculators.
2.5D recoding is almost done, it will probably be released in October, we'll go from there as quickly
as I can in the above order.
Thx
Art
Re: Arduino based Laser Control
Hi Art,
Definitely not trying to be pushy - I just got lost on the trail of things.
John
Definitely not trying to be pushy - I just got lost on the trail of things.
John
1% inspiration 99% try, try again
Re: Arduino based Laser Control
:) , Not a problem, it wasn't taken that way.
I should mention though, that as of Thursday this week, Ill be
away on vacation till Oct 1st. Development starts again on Gearotic on
Oct 2nd.
Art
I should mention though, that as of Thursday this week, Ill be
away on vacation till Oct 1st. Development starts again on Gearotic on
Oct 2nd.
Art
Re: Arduino based Laser Control
Hi John,John T wrote: Hi Art,
I don't know if this should be here or somewhere else. You have posted a 2.5D cut of the celtic knot done with your laser. Is it or will be be possible to generate gCode for a CNC machine to do the same cut?
I have been playing around with "knots" in Gearotic and can generate a dxf but it is just lines and has no z in it and the gCode doesn't seem to work for me.
John
Going back in time, Art created "Mach1Filter" which you could use to create the machining Gcode from the grey scale images of the Celtic knots.
If you are interested, I have described it in a bit more detail here http://openbuilds.com/threads/producing ... -free.380/
Tweakie.
Re: Arduino based Laser Control
Wow, even I had forgotten that one Tweaky.. lol
Ill be making a new one soon..for the Knots and for other possible uses, one
with a bit more power..
Art
Ill be making a new one soon..for the Knots and for other possible uses, one
with a bit more power..
Art
Re: Arduino based Laser Control
Those are just the words I love to hear Art "More Power" ;D
Tweakie.
Tweakie.
Re: Arduino based Laser Control
Hi art hope you had a good holiday don't reply to your back.
I am a bit confused about the pins you have set I am going to be using a Leonardo, I am not sure what pins to use for the lcd screen you have it down as A0-A6 is A6 digital pins 4.
all the other pins I can understand I will just use the one on the plan you did for what pins to use.
it will be 3-4 weeks before the parts show up so everything will probably change by then.
I have not change over to a Ti board yet as it will take a bit of recoding to get working as the way they do pwm is a bit different from arduino it will happen one day.
I am a bit confused about the pins you have set I am going to be using a Leonardo, I am not sure what pins to use for the lcd screen you have it down as A0-A6 is A6 digital pins 4.
all the other pins I can understand I will just use the one on the plan you did for what pins to use.
it will be 3-4 weeks before the parts show up so everything will probably change by then.
I have not change over to a Ti board yet as it will take a bit of recoding to get working as the way they do pwm is a bit different from arduino it will happen one day.
Re: Arduino based Laser Control
Hi Dan;
I do not have any of that information here in front of me, all of it is at Art's place. Hope you don't mind waiting until he gets back to get the answer, which should be towards the weekend sometimes? Sorry..
Cheers
Bob
>:(
I do not have any of that information here in front of me, all of it is at Art's place. Hope you don't mind waiting until he gets back to get the answer, which should be towards the weekend sometimes? Sorry..
Cheers
Bob
>:(
Gearotic Motion
Bob
Bob
Re: Arduino based Laser Control
Got this from line 50
//initialize the lcd..its on a0-a6 lines in my leonardo..
this is what worked for me.
Not pretty as I can not seem to write well with a mouse. ;D
I added the pot to control the contrast
- Attachments
-
Re: Arduino based Laser Control
char bro I don't mind waiting at all it will be a few weeks before all the parts show up
Re: Arduino based Laser Control
Thx Guys:
Yes, those seem correct as numbers. ( Preciate it ). The call to LCDInit shows the numbers
I used and what controls them. The line in the code for
LiquidCrystal lcd( 23,22,21,20,19,18);
shows the init of the lcd and its settings as to pin. So looking at the call above... the pins in order are
RS pin -- 23
Enable -- 22
D4 - D7 pins 21,20,19,18
These pin numbers correspond to A5 - A0 on the Leonardo..I suspect the pin numbering differs because
the library wasnt originally written for a leonardo so at the time I traced them by schematic as I recall..
If anyone has trouble with that usage let me know and Ill tear mine down to double check it, but I think
YaNvrNo has it right..
Art
Yes, those seem correct as numbers. ( Preciate it ). The call to LCDInit shows the numbers
I used and what controls them. The line in the code for
LiquidCrystal lcd( 23,22,21,20,19,18);
shows the init of the lcd and its settings as to pin. So looking at the call above... the pins in order are
RS pin -- 23
Enable -- 22
D4 - D7 pins 21,20,19,18
These pin numbers correspond to A5 - A0 on the Leonardo..I suspect the pin numbering differs because
the library wasnt originally written for a leonardo so at the time I traced them by schematic as I recall..
If anyone has trouble with that usage let me know and Ill tear mine down to double check it, but I think
YaNvrNo has it right..
Art
Re: Arduino based Laser Control
Hi All:
Schematic has been corrected as to pushbutton wiring ... the post at
http://gearotic.com/ESW/FavIcons/http:/ ... 7232#p7232
has been updated to show the fixes.
Thx
Art
Schematic has been corrected as to pushbutton wiring ... the post at
http://gearotic.com/ESW/FavIcons/http:/ ... 7232#p7232
has been updated to show the fixes.
Thx
Art
Re: Arduino based Laser Control
morning all I need some advice about what to use for a drive for a laser I will be using this is it
http://www.ebay.com/itm/2W-445nm-M140-B ... 2a2158fe9d
its a 2w 445nm Diode laser I will be running it at 2A 4.7vdc. what I need is advice on what to drive it with there is lot of info on driving a laser with a LT1121.
I Have a Schematic for it see attachment I know it is only for up to 1.5A I can get a bigger chip 2A+ for it is this schematic good enough to run with your controller art.
also I have striped back the sketch so it only has the Laser control stuff on it can someone have a look and see if I got it correct as I don't have all the parts yet so cant test it.I have disabled the LCD part as I am porting it over to run on a TI board
http://www.ebay.com/itm/2W-445nm-M140-B ... 2a2158fe9d
its a 2w 445nm Diode laser I will be running it at 2A 4.7vdc. what I need is advice on what to drive it with there is lot of info on driving a laser with a LT1121.
I Have a Schematic for it see attachment I know it is only for up to 1.5A I can get a bigger chip 2A+ for it is this schematic good enough to run with your controller art.
also I have striped back the sketch so it only has the Laser control stuff on it can someone have a look and see if I got it correct as I don't have all the parts yet so cant test it.I have disabled the LCD part as I am porting it over to run on a TI board
Code: Select all
#include <Wire.h>
#include <LiquidCrystal.h>
#include <PWM.h>
//Setup for Diags..
#define DIAGS 0
#define CNCMODE 1
#define NGRAVE 2
//frequency and pins used.
int32_t basefrequency = 5000; //5khz base freq
int8_t PulsePin = 9; //Pin 9 will control the laser.
int8_t BoardLED = 13;
int8_t FireLED = 12;
int8_t PowerLED = 5;
int8_t Pot = 4;
int8_t Buttons = 8; //analogue and digital are same numbers..be carefull if you use other pins..
int8_t Buttons1 = 10;
int8_t CurButton = 0; //currently pressed button
int8_t CountMode = 0; //the mode of the up/down counter..
bool WaitButtonZero = false;
int8_t OneMicro = 16;
int8_t OpMode = 0;
volatile unsigned short SerialIn = 0;
volatile unsigned short LastSerial = 0;
//volatile unsigned long SpinOnCnt = 0;
//volatile unsigned long SpinOffCnt = 0;
//volatile bool SpindleOn = false; //remote spindle command..
//volatile bool SpindlePWM = false; //remote spindle command current state..
//vars for control
bool PowerOn = false;
bool Tickle = false; // On Off Safety watchdog .. monitor the tickle for laser health
volatile int16_t Duty = OneMicro; //this is the pulse to pulse firepower during a shot.
volatile int32_t cnt = 0; //this is a global interrupt counter..
volatile bool FIRE = false;
//initialize the lcd..its on a0-a6 lines in my leonardo..
//LiquidCrystal lcd( 23,22,21,20,19,18); // set the LCD address to 0x27 for a 20 chars and 4 line display
// the main control variable for diags mode..
int16_t Power = 50; //0 - 100%
unsigned long PWMPower = 0;//0- 100% for the incoming PWM..
int16_t Freq = 5000; // frequency of pulses..
int8_t PotMode = 0;
volatile int32_t FireCount = 0; //number of pulses to fire in diags
volatile int16_t ReLoad = 1;
void setup()
{
// lcd.begin(20,4); // initialize the lcd
// lcd.setCursor(3,0);
// lcd.print("Gearotic Laser");
// lcd.setCursor(0,2);
// lcd.print("Waiting for Unix.");
InitTimers(); //start up the timers.
bool timeron = SetPinFrequency( PulsePin, basefrequency ); //set pulsepin to 5Khz
TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt, we'll use this one for fastpwm
attachInterrupt( 0, DUMMY, RISING ); //pulse external monitor
attachInterrupt( 4, DUMMY, CHANGE ); //sets the routine to call..
pwmWrite( PulsePin, 8); //set for 1us for laser tickle
if( timeron ) //if the timercall worked..
{
pinMode( BoardLED, INPUT); // board led life
pinMode( FireLED, OUTPUT); // fire button led
pinMode( PowerLED, OUTPUT); //power control led & control
pinMode( 2, INPUT); //inputs from breakout board
digitalWrite( 2, LOW );
pinMode( 3, INPUT); //inputs from breakout board
digitalWrite( 3, LOW );
pinMode( 11, INPUT); //inputs from breakout board
digitalWrite( 11, HIGH );
digitalWrite( PowerLED, PowerOn); //turn off led for power at start
pinMode( Pot, INPUT); //pot for variable control
digitalWrite(4, HIGH); //set for a pullup resistor
pinMode( Buttons, INPUT); //Jog buttons as analogue input
digitalWrite(Buttons, HIGH);
pinMode( Buttons1, INPUT); //Rest of buttons
digitalWrite(Buttons1, HIGH);
}
//SetDisplay( true ); //and draw the display mask
}
//main idle loop..
void loop()
{
HeartBeat(); //flash the board led if fire isnt flashing..
FlashFire(); // flash the fire button if we are going to fire..
WatchDog(); // ensure all is safe.
DiagsOut(); //display test text if demanded..not used
PotControl(); //use the pot for values..
GetButton();
if( OpMode == DIAGS ) DiagFire();
//if( OpMode == NGRAVE) NGraveFire();
LaserOnOff();
DoButtonCount(); // make freq or firecount set by button if needed.
//set power and other vars, then display..
//SetDisplay( false );
}
void DoButtonCount()
{
int8_t Accel = 1; //this is the accel of button freq, adjust as needed.
static int16_t Adder = Accel;
int16_t Freqmax = 200;
static int32_t Bres = Freqmax;
if( CurButton == 0)
{
Adder = Accel;
Bres = Freqmax;
return;
}
int16_t oldfire = FireCount;
Bres += Adder;
while( Bres > Freqmax ) //not very ellegant, fix later. just a timer for easier button press
{
if( CurButton == 4 ) //left arrow, switch pot to count mode..
CountMode--;
if( CurButton == 6 ) //left arrow, switch pot to dutycyle..
CountMode++;
if( CountMode < 0) CountMode = 2;
if( CountMode > 2) CountMode = 0;
Bres -= Freqmax;
if( CountMode == 0 && CurButton == 5) Freq++;
if( CountMode == 2 && CurButton == 5) FireCount++;
if( CountMode == 0 && CurButton == 7) Freq--;
if( CountMode == 2 && CurButton == 7) FireCount--;
if( FireCount < 0 ) FireCount = 5000;
if( FireCount > 5000 ) FireCount = 0;
if( Freq <= 0 ) Freq = 1;
if( Freq > 5000 ) Freq = 5000;
int oldop = OpMode;
if( CountMode == 1 && CurButton == 5 ) OpMode++;
if( CountMode == 1 && CurButton == 7 ) OpMode--;
if( OpMode > 2 ) OpMode = 0; //these two lines just make the opMode toggle up or down..
if( OpMode < 0 ) OpMode = 2;
//reopen file if required.
if( OpMode == NGRAVE && oldop != NGRAVE)
{
//detach the spindle interrupts.
detachInterrupt(4);
attachInterrupt( 1, DUMMY, RISING ); //reattach the spindle interrupt
}
if( OpMode != NGRAVE && oldop == NGRAVE )
{
attachInterrupt( 4, DUMMY, CHANGE ); //reattach the spindle interrupt
detachInterrupt(1);
}
}
if( oldfire != FireCount ) ReLoad = FireCount;
Adder += Accel;
//faster..damnit..faster. :)
if( Adder == 100 ) Adder *= 2;
if( Adder == 400) Adder *= 2;
if( Adder == 1000) Adder *= 2;
}
void DiagFire()
{
if( CurButton == 2 ) FireCount = ReLoad;
//FIRE!!!!
if( CurButton == 1 && FireCount > 0 ) FIRE = true;
if( CurButton == 0 && FIRE && OpMode == DIAGS ) FIRE = false; //turn it off if no button is pressed in Diags mode.
}
void LaserOnOff()
{
//this controls Laser ON/OFF
if( CurButton == 3 ) //power call , but only once per press
{
if( !WaitButtonZero) PowerOn = !PowerOn;
digitalWrite( PowerLED, PowerOn); //Set Power condition;
WaitButtonZero = true;
}
}
void DUMMY()
{
}
int16_t FireLaser()
{
int16_t ret = OneMicro; //usually we'll return 1 microsecond.
static int16_t Counter = basefrequency;
if( FIRE )
{
if( OpMode == DIAGS )
ret = Power << 5; //we'll return this power only if the counter says so..
else
ret = PWMPower << 5; //in CNC modes we return the duty cycle power
if( ret > 3191 ) ret = 3191; //set a maximum pulse wdith here for your cpu speed
//now decide on a frequcny basis is this is a shot time..
Counter += Freq;
if( Counter >= basefrequency )
{
Counter -= basefrequency;
//if( SpindleOn && FireCount > 2000 ) FireCount = 2000;
if( FireCount != 5000) FireCount--;
if( FireCount <= 0 ) FIRE = false;
}
else
ret = OneMicro;
}
if( ret < OneMicro ) ret = OneMicro; //no msaller than 1 microsecnd
return ret;
}
//display the text
///// Text Blockout
////////////////////////
// Pwr //
//Frq-hz 100 Pulses //
// 5000 <---> 5000 //
////////////////////////
//void SetDisplay( bool clear )
//{
// if( clear )
// {
// lcd.clear(); //x,y
// lcd.setCursor(8, 0);
// lcd.print("Pwr");
// lcd.setCursor(0, 1);
// lcd.print("Frq-hz");
// lcd.setCursor(14,1);
// lcd.print("Pulses");
// }
// static int8_t slw = 0;
// slw++;
// if( slw % 8 )
// if( SpindleOn && OpMode == CNCMODE ) //display of remote power setting..
// {
// lcd.setCursor(11, 0);
// lcd.print("-Rem:");
// lcd.setCursor(16, 0);
// lcd.print(" ");
// lcd.setCursor(16, 0);
// lcd.print(PWMPower,10);
// }
// else
// if( OpMode == NGRAVE )
// {
// lcd.setCursor(11, 0);
// lcd.print("-Rem:");
// lcd.setCursor(16, 0);
// lcd.print(" ");
// lcd.setCursor(16, 0);
// lcd.print(LastSerial,10);
// }
// else
// {
// lcd.setCursor(11, 0);
// lcd.print(" ");
// lcd.setCursor(16, 0);
// lcd.print(" ");
// }
//power
// lcd.setCursor(8,1);
// lcd.print( Power , 10 );
// lcd.print( "% " );
//frequency
// lcd.setCursor(3,3);
// lcd.print( Freq , 10 );
// lcd.print(" ");
//fire count
// lcd.setCursor(15,3);
// if( FireCount != 5000)
// {
// lcd.print( FireCount , 10 );
// lcd.print(" ");
// }
// else
// lcd.print(" CW ");
//and count mode
//lcd.setCursor(8,3);
// switch( CountMode )
// {
// case (0) :
// lcd.print("<<---");
// break;
// case (1) :
// lcd.print(" ^^^ ");
// break;
// case (2) :
// lcd.print("--->>");
// break;
// }
//static int toggle = 0;
// static bool twinkle = true;
// toggle++;
// if( toggle > 20 )
// {
// toggle = 0;
// twinkle = !twinkle;
// lcd.setCursor( 0,4 );
// if( twinkle ) lcd.print("*");
// else lcd.print("#");
// }
//erase the mopde line..
// lcd.setCursor( 0,2 );
// lcd.print(" ");
// if( SpindleOn && OpMode == DIAGS)
// OpMode = CNCMODE; //auto switch from Diags
// switch (OpMode)
// {
// case(0):
// lcd.setCursor( 8,2 );
// lcd.print("Diag");
// break;
// case(1):
// lcd.setCursor( 7,2 );
// lcd.print("CNC-CW");
// break;
// case(2):
// lcd.setCursor( 7,2 );
// lcd.print("NGRAVE");
// break;
//}
//}
//helper functions
void FlashFire()
{
static int8_t Flashtime = 0;
static bool fireledstate;
if( FireCount == 0 )
fireledstate = false;
if( Flashtime++ > 10 ) //this 10 should be change for a pleasant flash tempo..
{
digitalWrite( FireLED, fireledstate );
fireledstate = !fireledstate;
Flashtime = 0;
}
}
//flash the board led to show we're alive
void HeartBeat()
{
static int8_t Beat = 0;
static bool beatstate;
if( FireCount != 0 ) return;
if( Beat++ > 10 ) //this 10 should be change for a pleasant flash tempo..
{
//digitalWrite( BoardLED, beatstate );
beatstate = !beatstate;
Beat = 0;
}
}
//watchdog function, kill laser power if tickle stops..
//or other checks all of which can be put here..
void WatchDog()
{
static int lastcnt = cnt; //activity monitor
if( lastcnt != cnt ) Tickle = true;
else Tickle = false;
lastcnt = cnt;
//set other checks here... too long a shot maybe...
if( !Tickle )
{
PowerOn = false;
digitalWrite( PowerLED, PowerOn); //turn off led for power at start
}
}
//use of the pot for duty or frequency.
void PotControl()
{
int32_t val = analogRead( Pot + 2 ); //the analogue for the pot pin
if( PotMode == 0 ) // duty cycle.. only mode at present..
{
Power = val / 10.23;
if( Power < 1 ) Power = 1;
if( Power > 100) Power = 100;
Power = 101 - Power;
}
}
//diags text for testing and debugging..
void DiagsOut()
{
//just for testing pins..
return; //only use if we demand it in setup..
int16_t d1 = 0, d2 = 0, d3 = 0;
if( cnt > 2000)
{
cnt = 0;
d1 = analogRead(Pot + 2);
d2 = analogRead(8);
d3 = analogRead(10);
//Console.print("pins 6,8,10 --- " );
//Console.print(" ");
// Console.print( d1 );
//Console.print(" ");
//Console.print( d2 );
//Console.print(" ");
//Console.print( d3 );
//Console.print(" ");
//Console.print( CurButton );
//Console.println();
}
}
//figure out a button press, only one button
//at any time with noise rejection. This uses 2 analogue pins
//which multiplexes many buttons on each pin.
void GetButton()
{
int8_t setbounce = 4; //set a debounce here..
static int8_t debounce = setbounce;
static int8_t LastButton = 0;
int8_t thisbut = 0;
int16_t val = analogRead(Buttons); //fire,reload and laser
if( val < 900 )
{
thisbut = 3 - (val >> 8);
}
val = analogRead(Buttons1); //ok, read the fire buttons then..
if( val < 900 )
{
//figure out the button in the fire group
thisbut = (val >> 8) + 4;
}
if( LastButton == thisbut ) debounce--;
else debounce = setbounce;
if( debounce == 0 )
{
CurButton = thisbut;
debounce = setbounce;
}
if( WaitButtonZero && CurButton == 0)
WaitButtonZero = false;
LastButton = thisbut;
}
//make the frerq and count registers count by button.
//this gets called at timer reset time..
ISR(TIMER1_OVF_vect)
{
cnt++;
Duty = FireLaser(); //find the next power level..
OCR1A = Duty;
}
//these three interrupts are for step/dir and spindle pwm.
//used as direct vectors to get the speed required..
//this interrupt is for the step pulses..any step pulses, to
//set a firepulse..
ISR(INT0_vect)
{
//step interrupt...very fast
//if( (OpMode != DIAGS && SpindleOn))
{
FireCount = ReLoad;
FIRE = true;
}
}
//this is for recieving serial data power
//for 16 slice sequences.
ISR(INT1_vect)
{
//count the X steps as well for future use
if( PINB & ( 1 << 7))
SerialIn |= 0x8000;
if( (SerialIn & 0xf00f ) == 0xf00f)
{
// LastSerial = SerialIn & 0x0ff0;
LastSerial = (SerialIn >> 4) & 0xff;
SerialIn = 0;
if( LastSerial < 100 )
{
static unsigned short prev = 0;
if( prev == LastSerial ) //must be a repeated power..
PWMPower = LastSerial;
prev = LastSerial;
}
SerialIn = SerialIn >> 1; //we got a clock, so shift it..
}
}- Attachments
-
Re: Arduino based Laser Control
Hi DanL:
Wow, nice diode. Being blue it could also harden oxalic acid infused fibreglass resin ... nice thing to play with..
Schematic looks like it could be used, take not of just how important cooling is with such devices, I have a few lower
power ones that I run for small periods at times and cooling is really very very important as you get up to 2 watts. A blue 2 watt is quite powerfull really, be interesting to see how you make out..
Id change the line in the code at
pwmWrite( PulsePin, 8); //set for 1us for laser tickle
to 0, as you dont want 1us tickles, you want 0us as a tickle and only want the
PWM to be on when the laser is. Set the variable OneMicro to 0 as well, it defines the PWM timer's
one microsecond setting. That will then make the laser only fire when given a power from Dariwn greater
than 0%. Probably take some fudging about in the rest of the code but those two changes should
make it run as youd expect, making the PWM really into a TTL trigger in PWM form..
Ill be interested in how you make out, feel free to ask questions if you run into trouble
as you test. Hard to say without testing what trouble youll run into , youll probably want
to use some sort of console messaging for feedback to tell you whats up during testing...
Art
Wow, nice diode. Being blue it could also harden oxalic acid infused fibreglass resin ... nice thing to play with..
Schematic looks like it could be used, take not of just how important cooling is with such devices, I have a few lower
power ones that I run for small periods at times and cooling is really very very important as you get up to 2 watts. A blue 2 watt is quite powerfull really, be interesting to see how you make out..
Id change the line in the code at
pwmWrite( PulsePin, 8); //set for 1us for laser tickle
to 0, as you dont want 1us tickles, you want 0us as a tickle and only want the
PWM to be on when the laser is. Set the variable OneMicro to 0 as well, it defines the PWM timer's
one microsecond setting. That will then make the laser only fire when given a power from Dariwn greater
than 0%. Probably take some fudging about in the rest of the code but those two changes should
make it run as youd expect, making the PWM really into a TTL trigger in PWM form..
Ill be interested in how you make out, feel free to ask questions if you run into trouble
as you test. Hard to say without testing what trouble youll run into , youll probably want
to use some sort of console messaging for feedback to tell you whats up during testing...
Art
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