"Is Blowing" Relay

Discussions and help on this commercial controller.

Moderator: twehr

Re: "Is Blowing" Relay

Postby J45on » Fri Oct 14, 2011 6:20 pm

I shall have a play around and try to figure out the voltages needed to trigger the relay
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Re: "Is Blowing" Relay

Postby bdring » Fri Oct 21, 2011 1:53 pm

Thunder Laser confirmed the problem with the relay. This was their response.

we changed the small part in the controller.
by the way, the "TTL-" has the same function as the Blow air,
so the customers who got the small board from us should be able
to use the air control function if they connect to "TTL-"


I don't really understand what TTL- they are talking about.

Anyway, I have a whole bunch of Pololu socket compatible relay drivers coming soon, so anyone with a 4 axis board can drop one into the 4th socket and control up to two devices. It will also work with Mach3, EMC, GRBL, etc.
Bart
"If you didn't build it, you will never own it."
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Re: "Is Blowing" Relay

Postby J45on » Fri Oct 21, 2011 8:47 pm

I have received a similar email from Thunder
They also offered to exchange my board if this method does not work
I have a logic probe so I will have a careful probe tomorrow , I also bought a few
LM311N volt comparators from ebay and will have a go at using them as well to knock up a bread board circuit
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Re: "Is Blowing" Relay

Postby J45on » Sat Oct 22, 2011 11:18 am

I have probed the TTL- and it only goes low when the laser fires so my fans and air assist would be going off between cuts for example :lol: not what I want
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Re: "Is Blowing" Relay

Postby BenJackson » Sat Oct 22, 2011 6:34 pm

You could easily stretch that with a simple 555 circuit (or heck, a microcontroller, since they're so cheap these days).
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Re: "Is Blowing" Relay

Postby macona » Sun Oct 23, 2011 10:41 pm

J45on wrote:I have probed the TTL- and it only goes low when the laser fires so my fans and air assist would be going off between cuts for example :lol: not what I want


I had the same exact problem with a Leetro controller. The output for the air assist would turn on/off with the laser. I solved this by using a delay-off relay. I think I set it to about 5 seconds. So as long as the laser cuts within 5 seconds of the last cut the air will be on till its done +5 seconds after that.
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