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5VDC Outout on Einsy  

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AZGLi
(@azgli)
Eminent Member
5VDC Outout on Einsy

I noticed that there is a header marked 5V on the Einsy board. I would like to add a hot-end light to the MK3 and I was wondering how much current this header is rated for. I think the light I have in mind will pull about 100 mA and I don't want to fry the Einsy since they don't seem to be available.

Posted : 30/12/2017 9:55 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
Re: 5VDC Outout on Einsy

You would be better considering using a fèed of the 24 volt supply perhapzs with a digital step down voltage convertor or putti g a number of LEDs in series with a current limiting resistor to use 24 volts direct. This would produce similar.light with lower current. Then you could consider isi g a feed in parallell with the extruder fan... rather tha n a new feed when the ran is off. There is little to look at.

Regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 30/12/2017 11:08 pm
keith.m10
(@keith-m10)
Eminent Member
Re: 5VDC Outout on Einsy


I noticed that there is a header marked 5V on the Einsy board. I would like to add a hot-end light to the MK3 and I was wondering how much current this header is rated for. I think the light I have in mind will pull about 100 mA and I don't want to fry the Einsy since they don't seem to be available.

Those pins are rated for about 1 amp but the on-board 5 volt regulator would get hot if you tried to pull that much, but !00 ma should not cause a real problem.

Posted : 31/12/2017 1:00 am
AZGLi
(@azgli)
Eminent Member
Topic starter answered:
Re: 5VDC Outout on Einsy

Thanks!

Posted : 31/12/2017 4:12 am
AZGLi
(@azgli)
Eminent Member
Topic starter answered:
Re: 5VDC Outout on Einsy


You would be better considering using a fèed of the 24 volt supply perhapzs with a digital step down voltage convertor or putti g a number of LEDs in series with a current limiting resistor to use 24 volts direct. This would produce similar.light with lower current. Then you could consider isi g a feed in parallell with the extruder fan... rather tha n a new feed when the ran is off. There is little to look at.

Regards Joan

I disagree about there being little to look at. I am continually attempting to see what is happening at the nozzle, on both my MK2 and MK3. These are the most time intensive printers I have used so far and I am continually attempting to get the Z level correct, to clean build up off the nozzles after the support fails, and trying to see just what the printer is doing when it makes funny clicking sounds. I have 6 other printers and I spend 75% of my maintenance time on the two Prusas. Being able to see what is happening real time without a flashlight will be highly convenient.
Also, you should not put LEDs in series - they work much better in parallel with their own resistor. This allows controlled voltage drop over each LED and keeps the current constant.
The 12 VDC supply on the MK2 has an extra set of terminals and I have plugged into that already on the MK2. The MK3 doesn't have that extra set and does have the 5VDC output which is convenient to get to, especially if all I am running on it is a LED light.

Posted : 31/12/2017 4:29 am
JoanTabb
(@joantabb)
Veteran Member Moderator
Re: 5VDC Outout on Einsy

Hi Ben,

I can understand where our thoughts differ when I was suffering a debilitating bout of cellphone dyslexia...

sorry for all of the spelling mistakes...

what I was trying to say, was,
I would rather not use the 5 volt rail... you are welcome to go that route.
if the feed for the LED's is taken in parallel with the extruder fan, it would remove the need for an additional switch, and when the fan is off, ( below 50 degrees centigrade,) the extruder is too cold to extrude all normal engineering plastics, so during that period of the heating, and cooling process, there is little activity of interest (to me) to look at.

I hope this is more understandable.

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 31/12/2017 1:42 pm
AZGLi
(@azgli)
Eminent Member
Topic starter answered:
Re: 5VDC Outout on Einsy


Hi Ben,

I can understand where our thoughts differ when I was suffering a debilitating bout of cellphone dyslexia...

sorry for all of the spelling mistakes...

what I was trying to say, was,
I would rather not use the 5 volt rail... you are welcome to go that route.
if the feed for the LED's is taken in parallel with the extruder fan, it would remove the need for an additional switch, and when the fan is off, ( below 50 degrees centigrade,) the extruder is too cold to extrude all normal engineering plastics, so during that period of the heating, and cooling process, there is little activity of interest (to me) to look at.

I hope this is more understandable.

regards Joan

Yes, that is much more understandable. I agree, that while the nozzle is cool there isn't much to look at. I don't mind having the light on while the printer is powered on and I didn't plan to add a switch, just have the light powered on all the time. As they are LEDs, the current draw is relatively small. I had a similar setup on my MK2 until a print failure destroyed the part and it was really nice to be able to see what was happening, especially while changing nozzles, etc.
The problem with using the fan feed is that the fan feed is PWM and this will cause the LEDs to flicker, which is really annoying.

Posted : 31/12/2017 8:47 pm
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