ONE PING ONLY --- M42

tecno

How can I get M42 to give one shot and wait for next trigpoint?

;Camera trigger
M950 P0 C"io1.out" Q1
M42 P0 S1

Contious triggering of the camera.

jay_s_uk

@tecno whats your method of triggering it now?

I would suggest using a custom gcode e.g. M5000 and creating a file called M5000.g in sys.
The contents could then be

M42 P0 S1
G4 P500
M42 P0 S0

That would turn the output high for 0.5 seconds whenever M5000 is called

tecno

@jay_s_uk said in ONE PING ONLY --- M42:

M42 P0 S1 G4 P500 M42 P0 S0

Still continious, so question is if my M950 needs editing?

jay_s_uk

@tecno what do you mean its still continuous?
Are you using M42 in your config.g?

tecno

@jay_s_uk

No M42 in config.g

M950 in config.g
M5000.g in sys

Console command M5000

It triggers but does it coninously instead of one shot

jay_s_uk

@tecno maybe 0.5s is too long, try reducing to P100
Otherwise it sounds like you might need to add something to pull it back down to ground once released?

tecno

@jay_s_uk
Tested that still same issue

tecno

@jay_s_uk said in ONE PING ONLY --- M42:

@tecno maybe 0.5s is too long, try reducing to P100
Otherwise it sounds like you might need to add something to pull it back down to ground once released?

Take away the 1K serial resistor on output?

jay_s_uk

@tecno dunno, i'm not really an electronics guy

tecno

@jay_s_uk said in ONE PING ONLY --- M42:

@tecno dunno, i'm not really an electronics guy

Tested = same issue

Hopefully sombody else chimes in ta advice what to try next.

Thanks !

fcwilt

@tecno

What are the specs on the device you have connected to that output?

What does it expect to see in the way of signal voltage and duration?

Frederick

tecno

@fcwilt said in ONE PING ONLY --- M42:

@tecno

What are the specs on the device you have connected to that output?

What does it expect to see in the way of signal voltage and duration?

Frederick

The IO output goes go GND to trigger camera ( switch is NO and swithes to ground )

https://forum.duet3d.com/topic/23976/mini5-bt-dongle-for-transmit/19

jay_s_uk

@tecno can you change the M950 to

M950 P0 C"^io1.out" Q1

tecno

@jay_s_uk said in ONE PING ONLY --- M42:

@tecno can you change the M950 to
M950 P0 C"^io1.out" Q1

Tried that still same issue with serial 1K, will test with no serial 1K

tecno

@fcwilt @jay_s_uk

IT WORKS NOW !!!

;Camera trigger
M950 P0 C"!io1.out" Q1

Thank you guys, this forum is so helpful !

fcwilt

@tecno said in ONE PING ONLY --- M42:

@fcwilt @jay_s_uk

IT WORKS NOW !!!

;Camera trigger
M950 P0 C"!io1.out" Q1

Thank you guys, this forum is so helpful !

Glad to hear you got it working.

Do you understand why you needed that ! character?

Frederick

alankilian

@tecno

Excellent.

I did say:

I would put a series resistor inline.
Maybe 100 Ohms to 1,000 Ohms and try it.

So I was already thinking 1,000 Ohms might be too large.

I'm glad you stuck with the experiments and got it working!

tecno

@fcwilt said in ONE PING ONLY --- M42:

@tecno said in ONE PING ONLY --- M42:

@fcwilt @jay_s_uk

IT WORKS NOW !!!

;Camera trigger
M950 P0 C"!io1.out" Q1

Thank you guys, this forum is so helpful !

Glad to hear you got it working.

Do you understand why you needed that ! character?

Frederick

This inverts the signal and by that the level rises above the trigg point in the BT circuit, right?

tecno

@alankilian said in ONE PING ONLY --- M42:

@tecno

Excellent.

I did say:
I would put a series resistor inline.
Maybe 100 Ohms to 1,000 Ohms and try it.
So I was already thinking 1,000 Ohms might be too large.

I'm glad you stuck with the experiments and got it working!

Experiments are always good as long one tries to follow good practis, in my case ask questions frequently.

Thanks for guidance!

fcwilt

@tecno said in ONE PING ONLY --- M42:

@fcwilt said in ONE PING ONLY --- M42:

@tecno said in ONE PING ONLY --- M42:

@fcwilt @jay_s_uk

IT WORKS NOW !!!

;Camera trigger
M950 P0 C"!io1.out" Q1

Thank you guys, this forum is so helpful !

Glad to hear you got it working.

Do you understand why you needed that ! character?

Frederick

This inverts the signal and by that the level rises above the trigg point in the BT circuit, right?

Correct.

Without that ! character the normal state of the output is low which is the state that triggers the camera. Adding that ! character makes the normal state of the output high.

Frederick