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1  Community / Website and Forum / UDP NTP Client - NIST Internet Time Service changes on: December 16, 2012, 10:59:38 pm
The IP that is used in the UDP NTP Client is going to be abandoned Dec 17th.

I found out about it by chance, I happened to stumble across this page: The nice thing about the page is it give a long list of other IP addresses that can be used and their current status.

Merry Christmas!
2  Using Arduino / General Electronics / Re: What to use to power a Water Pump on: August 15, 2012, 06:30:37 pm
I think I'm missing something here. Can't I put out a low voltage directly from the Arduino with an analog pin? Nothing should be wasted in that case.

Perhaps part of the problem is we're not being exacting with language.

  • There isn't an analog out (AO) pin on the Arduino.
  • There are only digital outputs (DO).
  • Some of the DOs are PWM.
  • A PWM DO can mimic an AO in some cases.
  • To further confuse things, analogWrite() is used to set the PWM rate.

3  Using Arduino / General Electronics / Re: What to use to power a Water Pump on: August 15, 2012, 01:04:58 pm
Would it be possible for me to control the level at which the water pump operates if I use this method? Ie full power, low power, etc.

I'm not sure what you mean by "level." I think you mean motor speed, see

If you mean water level to determine when to run the pump, see

4  Using Arduino / General Electronics / Re: Source for switches on: August 15, 2012, 12:21:41 pm
Thanks! I appreciate the help.

5  Using Arduino / General Electronics / Source for switches on: August 14, 2012, 10:04:59 am
I'm looking for up-down-left-right switch set. Something like either one of these examples:

Anyone got a source for something like this? I've looked all over the place but can't find anything that I like.

6  Using Arduino / Project Guidance / Re: 240/250V relay question on: December 18, 2011, 01:40:22 pm
I would buy a pre-assembled Arduino compatible relay board. I've seen them with 1, 2, 4, 8 and 16 channels. Many of them can handle 10A @ 240V loads. If the load is greater than 80% of the relay rating, I would use the relay to drive a contactor.


If you're sold on using SSRs, yes, you can directly connect them to the Arduino. Your specs say the SSRs have a 7.5 mA trigger, the Arduino DOs are rated at 40 mA so directly connecting them means 5 or less per DO.

As a simple safety feature, I would separate the Arduino from the SSRs with an opto-isolator.
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