Author Topic: Grayscale problem-help  (Read 6511 times)

Pgold01

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Re: Grayscale problem-help
« Reply #15 on: November 13, 2016, 06:43:49 AM »
Thanks Beikeland,

Let see if I got it right:
If I use the NANO controller type L7, than the Jumper is used now as an adapter mean to connect the TTL output (Positive Line), which is the Pin with the V09 marking (also called D11), to the Laser module ?  If so where is the negative TTL conductor will be connected?

Does it interferes with the 1.1 Grbl as I recall that the Jumper should be connected?

Sorry for the confusion.


Zax

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Re: Grayscale problem-help
« Reply #16 on: November 13, 2016, 07:02:37 AM »
You actually connect laser power to the 12V or fan socket, so it's always energized and bypasses the MOSFET.

The TTL signal needs to connect to the D11 PWM pin on the Nano, I used the jumper as a simple method to accomplish this without soldering but you can do it various ways. Placing the jumper on the 0.9 position just routes D11 to the MOSFET which we aren't going to use in this configuration.

Pgold01

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Re: Grayscale problem-help
« Reply #17 on: November 13, 2016, 07:26:01 AM »
Thanks ZAX,
Is the other wire of the TTL pair signal is just an 0  (ground) and does not have to be connected?

beikeland

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Re: Grayscale problem-help
« Reply #18 on: November 13, 2016, 08:32:15 AM »
You only need the laser and L7 to have common ground, since the laser gets this from the 12V supply there is no need for adittional ground wire. If you had used an external powersupply only for the laser, then you would have needed the ground wire. HTH.

Pgold01

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Re: Grayscale problem-help
« Reply #19 on: November 13, 2016, 08:35:08 AM »
Beikeland, thank a lot for your help.

beikeland

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Re: Grayscale problem-help
« Reply #20 on: November 13, 2016, 11:02:30 AM »
One think to keep in mind; if you use D11 directly from the Nano you could inadvertently enable the laser when powering on, when uploading new firmware and possibly other times, so use goggles, disconnect the laser, or use some kind of shutter to protect yourself from the laser.

I just tested this and noticed the laser coming on while uploading new firmware; being lazy I still had my goggles on so no harm done.

I ended up just plugging the 2pin XH2.54 connector onto the jumper under the Nano - did raise the Nano about 1mm but not enough to be an issue it seems. Will move towards CNC shield when I figure out a solution for the microstepping.

woocro

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Re: Grayscale problem-help
« Reply #21 on: November 13, 2016, 11:31:58 AM »
so if i got it right, i need to buy new diode, or buy this driver: http://www.ebay.com/itm/12V-TTL-1W-2W-3W-445nm-450nm-Laser-Diode-LD-Driver-Power-Supply-Stage-Light-/121849894250?hash=item1c5ed1d56a:g:IAYAAOSwZ1lWf14r

and then disassemble my diode, remove driver and connect this one to diode and i am ready to go?

thank you!


edit: now i see that this driver Su*ks..:D
« Last Edit: November 13, 2016, 11:33:20 AM by woocro »

beikeland

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Re: Grayscale problem-help
« Reply #22 on: November 13, 2016, 11:53:33 AM »
I'm using that very driver now, but not on the original module as it is awaiting a DOA replacement. But I have it installed on a similar module with a 50mW diode, seems to work fine, need to determine witch PWM frequency gives the best response if there is any difference.

(edit: was cheaper over here btw. https://www.aliexpress.com/item/12V-TTL-1W-2W-3W-445nm-450nm-Laser-Diode-LD-Driver-Power-Supply-Stage-Light/32699520639.html
I got mine for $3.49 i think, gone up since then)
« Last Edit: November 13, 2016, 11:57:07 AM by beikeland »