Hi everybody, I have a relay which I can control via arduino. I wanna use this relay to control extruder temperature. Is it possible on teacup firmware? I just saw pwm pin options there. Please let me know. Thanks! https://reprap.org/forum/read.php?1,223853,223853#msg-223853 Mon, 20 Jul 2026 05:29:43 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,223853,224589#msg-224589 https://reprap.org/forum/read.php?1,223853,224589#msg-224589 I am using a DC-DC solid-state relay for the hot-end as I am using 12 volts DC, but the heated bed I use a DC-AC solid-state relay because it is a mains powered heater pad. Being as they are solid-state an have no moving parts, the switching on and off (very fast) has no problem or sound.
Both work fine, no issues at all. Overcame my power problems and the over heating at the Molex plugs on the board as the solid-state relay uses very little power to switch on and off (almost none)

Cheers,
Reg]]> regpye General Sat, 06 Jul 2013 10:24:03 -0400 https://reprap.org/forum/read.php?1,223853,224556#msg-224556 https://reprap.org/forum/read.php?1,223853,224556#msg-224556
You can use simple bang-bang: turn the heater on if the temperature is too low, turn it off if it's to warm. That's what many firmwares use for the heated bed (high thermal mass, relative low heating power), but for extruders, this would likely wear out the relay within a few days, too.

There are MOSFET based DC relays, like the (shameless plug) SevenSwitch.]]> Traumflug General Sat, 06 Jul 2013 06:59:34 -0400 https://reprap.org/forum/read.php?1,223853,224389#msg-224389 https://reprap.org/forum/read.php?1,223853,224389#msg-224389 -------------------------------------------------------
> I am running my heatbed through relay, haven't
> seen a hotend through relay yet, but I guess it
> would work the same way :) Good luck!


You can get away with using a relay on the heatbed because of the lower PWM frequency. The extruder's PWM is much faster and will destroy that relay quickly. MOSFETs with a low RDS-ON is the way to go in both cases.]]> DanMoto General Fri, 05 Jul 2013 12:53:15 -0400 https://reprap.org/forum/read.php?1,223853,224101#msg-224101 https://reprap.org/forum/read.php?1,223853,224101#msg-224101 meybivi General Thu, 04 Jul 2013 15:21:00 -0400 https://reprap.org/forum/read.php?1,223853,223910#msg-223910 https://reprap.org/forum/read.php?1,223853,223910#msg-223910 Ohmarinus General Thu, 04 Jul 2013 05:20:53 -0400 https://reprap.org/forum/read.php?1,223853,223885#msg-223885 https://reprap.org/forum/read.php?1,223853,223885#msg-223885 Srek General Thu, 04 Jul 2013 02:59:52 -0400 https://reprap.org/forum/read.php?1,223853,223871#msg-223871 https://reprap.org/forum/read.php?1,223853,223871#msg-223871 victorjung General Thu, 04 Jul 2013 01:42:49 -0400 https://reprap.org/forum/read.php?1,223853,223864#msg-223864 https://reprap.org/forum/read.php?1,223853,223864#msg-223864 meybivi General Thu, 04 Jul 2013 01:14:00 -0400 https://reprap.org/forum/read.php?1,223853,223860#msg-223860 https://reprap.org/forum/read.php?1,223853,223860#msg-223860 so when firmware turns heater on it will trigg relay and that is it.


just make shure that that you dont have problems with relay, it would not be nice if relay stucks on powered state...

so you need relay that triggers on 12V]]> woo General Thu, 04 Jul 2013 00:28:03 -0400 https://reprap.org/forum/read.php?1,223853,223853#msg-223853 https://reprap.org/forum/read.php?1,223853,223853#msg-223853
Please let me know.

Thanks!]]> meybivi General Wed, 03 Jul 2013 23:33:36 -0400