Welcome! Log In Create A New Profile

Advanced

Using an electromagnet with RAMPS

Posted by marsius 
Forum List Message List New Topic
marsius
Using an electromagnet with RAMPS
October 06, 2015 12:24PM
What is the best way to connect a 12V electromagnet to RAMPS?

Ideally without using D8, D9 and D10. Is it a good idea to use the 12V AUX pins (here marked as extruder fan)?

Edited 1 time(s). Last edit at 10/07/2015 03:46AM by marsius.
Reply Quote
enif
Re: Using an electromagnet with RAMPS
October 06, 2015 03:00PM
The 12V AUX pin is a constant 12V outlet, i.e. it's always "on" and there is no way to switch it from the MEGA.
Reply Quote
marsius
Re: Using an electromagnet with RAMPS
October 06, 2015 04:48PM
With the Fan Extender it would be possible, right?

Is there another option?
Reply Quote
o_lampe
Re: Using an electromagnet with RAMPS
October 07, 2015 04:57AM
With an electromagnet ( ie: solenoid ) you get problems with backEMV when you switch off the coil. Be sure you have the right suppressor diode installed.
-Olaf
Reply Quote
Dust
Re: Using an electromagnet with RAMPS
October 07, 2015 06:01AM
like this

You cant use fan extenders, they are low current devices

You can use D8, D9 and D10, just remove the mosfet and use its as a IO pin to drive the optocoupler

And as already stated you need to deal with the backEMV, or what ever devices you use will die.
Reply Quote
marsius
Re: Using an electromagnet with RAMPS
October 07, 2015 07:41AM
For the fan extender I linked above, it says max 0.5A per channel. The electromagnet I want to use needs only 0.33A, so as long as I add a flyback diode it should work, right?
Reply Quote
o_lampe
Re: Using an electromagnet with RAMPS
October 08, 2015 04:08AM
The fan extender already has a flyback diode.
I wouldn't put my money on the durability of this setup, but it's worth a try.
-Olaf
Reply Quote
Newer Topic Older Topic
Sorry, only registered users may post in this forum.

Click here to login