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Daox · 01-16-13, 10:16 AM

I don't have any experience with PID loops. The concept doesn't seem too hard, but programming one sounds like it might be fairly complex.

I can help with your relay problem though:

For low current DC, you can use reed relays. They can typically handle switching loads of around 100mA.

The next step up is using a transistor of some sort. To get more gain you might need to use two transistors, or a transistor that switches a relay.

The easiest thing for switching AC power is a solid state relay. The arduino can switch them directly. I'm using one of these in my attic heat project to power the fans.

01-16-13, 10:16 AM	#2
Daox Administrator Join Date: Aug 2008 Location: Germantown, WI Posts: 5,525 Thanks: 1,162 Thanked 374 Times in 305 Posts	I don't have any experience with PID loops. The concept doesn't seem too hard, but programming one sounds like it might be fairly complex. I can help with your relay problem though: For low current DC, you can use reed relays. They can typically handle switching loads of around 100mA. The next step up is using a transistor of some sort. To get more gain you might need to use two transistors, or a transistor that switches a relay. The easiest thing for switching AC power is a solid state relay. The arduino can switch them directly. I'm using one of these in my attic heat project to power the fans. __________________ Current project - To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. & To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Last edited by Daox; 01-16-13 at 10:18 AM..