V3 Coil Carbine / Electromagnetic Projectile Accelerators / Forums

Forums

4hv.org :: Forums :: Electromagnetic Projectile Accelerators

« Previous topic | Next topic »

V3 Coil Carbine

first previous 7 8 9 10 next last

Move Thread

LAN_403

ben5017

Fri Mar 08 2013, 05:32PM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

can you send me triggerin code pretty please

Maxwell

Fri Mar 08 2013, 06:42PM

Registered Member #8497 Joined: Tue Dec 04 2012, 06:24PM
Location:
Posts: 74

Just the part to trigger an SCR?

Thats only like 3 new lines of code:

pinMode(4,OUTPUT); //SCR Gate Output (through TIP-120 transistor)

if(engage==1)
{
digitalWrite(4,HIGH) ; //pin 4 goes high to transistor
delay(1); //delay 1ms
digitalWrite(4,LOW);
speed_trap(10,11); //digitalPin# entry, digitalPin# exit
}

ben5017

Fri Mar 08 2013, 07:57PM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

need to link up my optical sensors to the arduino then output to igbt

ben5017

Fri Mar 15 2013, 01:07AM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

max, how about an adjustable one shot timer?

Maxwell

Fri Mar 15 2013, 01:19PM

Registered Member #8497 Joined: Tue Dec 04 2012, 06:24PM
Location:
Posts: 74

@ben5017 - I just saw your post.
Explain specifically the order in which you would like things to happen and I can code it up for you no problem

ben5017

Sun Mar 17 2013, 06:55AM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

Max this is what I need

Phase 1:
1: pulling the trigger activates a 1shot trigger output with an adjustable pulse length.
2:when a switch is flipped, pulling and holding the trigger no longer oneshots but puts it into astable output with adjustable on/off times.
3:(x5) sensor setups that will be connected to the output of my optical gates (IR diode + opamp) which when a slug blocks the beam the arduino will send a signal to my igbt gate drivers.

the above is the minimum things I need right now to fire the x3cc.

Phase 2:
After that I will be working on the drum magazine which will hold 30+ slugs. I plan on connecting it to a continuous rotation servo or a dc/gear reducer motor, or maby a stepper, haven't decided yet. these will be controlled by the arduino which will read a signal from a hall effect sensor that will detect the presence of a slug. The arduino will rotate the motors as soon as it doesn't detect anything, until it does. the sensitivity will need to be adjustable as well to dial the feeding system in.

phase 3:
The frame will be the final step after it is firing/feeding acceptable and i get my cnc router fully operational.

Hope this helps.

ben5017

Tue Mar 19 2013, 03:16AM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

update:

phase 1: #3 Done

got the firing code for one of my optical sensors working, along with an auto calibration of the sensor upon program start up to set expected max min values, along with a manual sensitivity adjustment 0-255. still have to add the rest of the stages. The sensor is super sensitive. cant wait to see If it makes it shoot any faster. (Would the arduino digital output be that much quicker than a 555?)

next up is the triggering code. I messed around with modifying a De-bouncing trigger code for a bit today. trying to act as a adjustable pulse "one shot", with out much luck. Haven't given much thought to the select fire yet either.(max where you at bro??)

Maxwell

Wed Mar 20 2013, 02:02AM

Registered Member #8497 Joined: Tue Dec 04 2012, 06:24PM
Location:
Posts: 74

Hi ben5017,

Been quite busy with other things at the moment - apologies on the delayed code.

The arduino can output hellafast for what it is - roughly 1059times/millisecond without overhead.

You can use the delaymicroseconds command to turn on/off very quickly:
"
digitalWrite(outPin, HIGH); // sets the pin on
delayMicroseconds(50); // pauses for 50 microseconds
digitalWrite(outPin, LOW); // sets the pin off
"

Yandersen

Wed Mar 20 2013, 10:27AM

Registered Member #6944 Joined: Fri Sept 28 2012, 04:54PM
Location: Canada
Posts: 340

How about some noise-supression to prevent possible false-triggering? ALL inputs must become insensitive to ANY signals for a dozen microseconds every time after ANY of the coils got energized or switched off, as this process emits high level EMI.

ben5017

Wed Mar 20 2013, 05:12PM

Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156

yan:

1 step ahead of you. Have a few picked out. I dunno how to size them though. Take a look if you get a chance http

Max: gonna mess around with the injector driver code tonight. Ill keep you posted. Thanks for the tips. Any more commands you think might be usefull? links to a good refrence?

first previous 7 8 9 10 next last

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob