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1  Using Arduino / Project Guidance / Should I be Worried about Random Noise Triggering Outputs on: April 06, 2014, 07:00:38 pm
I'm going to be controlling some HO Scale Traffic Lights anywhere from 2 to 8 feet away from the Arduino board. The lights run on 5 VDC and I'm programming the Output Pins to go to Ground to turn them on. Probably about 5ma or less for each LED.  I plan to run CAT 5 wire from terminal strips that are wired to the Arduino. Should I be concerned about the Trains running around the track and generating "noise"?  It's been suggested to me that I add a small transistor (2N2222 or equiv.) to each output line at the Arduino and then run the wires from that.  Help and suggestions are appreciated. I'm still a newbie at this. Thanks!
2  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 22, 2014, 12:32:16 am
Yep to PWM on DC only. Might be a year (or more) before the rides are built and running. I still need to finish Main
Street and then start work on the rest of the town. Another plan for the town is to use a light sensor and have the Arduino slowly bring up the town and building lights as the train room gets darker. Not enough time in the day :>)
3  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 22, 2014, 12:07:23 am
I still use plain old DC for my locos. The focus of my layout is more on the buildings and details. The motors I want to control are for my Carnival rides. Some are 12 volt DC and some are 16 volt AC. But it sounds like a motor shield might be a better way to go. I'll look into it once the rides are built.
4  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 21, 2014, 09:54:14 pm
Thanks.  I can't wait to get my2560 and start learning about it!
5  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 21, 2014, 08:21:45 pm
Electrically isolated sounds good to me.  Another question.....how far from the Arduino board can I mount the Relay board? And a related question.....I'm going to be hooking up some HO scale traffic lights straight to the Arduino outputs. The LEDS draw about 5ma @ 5VDC. Could I place the lights a 2-3 feet away?  Thanks.
6  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 21, 2014, 05:10:51 pm
What are the advantages/disadvantages to using a board with transistors or optocouplers? Does one or the other draw less current from the Arduino? And, when would optocouplers be required, or not? I just want to make sure I buy the correct board. I'm going to be using the relays to turn small AC and DC motors on and off. Thanks.
7  Using Arduino / General Electronics / Re: Relay Board on eBay with 8 Relays on: March 21, 2014, 04:02:55 pm
Luxxtek and JoeN,  Thank you both for your replies. Yes. These are the relay boards I'm talking about. So the Arduino doesn't drive the relay coil itself? It connects to an optocoupler or transistor on the relay board and THEY activate the relay coil?  Sounds like they work fine together then. And yes,I will be powering the relay board and quite possibly the 2560 with external supplies. And there will be a separate supply for the devices that the replay will activate.  George
8  Using Arduino / General Electronics / Relay Board on eBay with 8 Relays on: March 21, 2014, 02:56:22 pm
Hi, I'm a noobie and have a Mega2560 on order. I want to control some AC and DC motors, among other things. There are a bunch of Relay Boards with 8 relays, made in China, on eBay. Does anyone have any experience with these?  Good? Bad? The specs I can find say they require about 15-20ma to activate the coil. Will the 2560 handle this? Thanks for any help/advice. George B
9  Using Arduino / Project Guidance / 16V AC Small Motor Control Is it possible? on: February 08, 2012, 04:30:16 pm
Hi, I'm new to the group and Arduino. I'd like to control a small 16V AC motor (~700ma). Need to vary the speed and run it forward and backward. Is that possible with the Arduino and additional components? Any one ever tried/done it? Thanks for any suggestions!  George B
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