Comments on: An OOK relay http://jeelabs.org/2009/10/12/an-ook-relay/ Computing stuff tied to the physical world Mon, 06 Feb 2012 13:55:24 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: jcw http://jeelabs.org/2009/10/12/an-ook-relay/#comment-572 jcw Fri, 23 Oct 2009 09:05:34 +0000 http://news.jeelabs.org/?p=3138#comment-572 <p>Short answer: don't - see http://news.jeelabs.org/2009/02/27/out-of-spec/</p> <p>Running the ATmega at 3V and 16 MHz is going to be pushing the limits even further. So far, I have not seen any problems with running the ELV receivers at 3.3V - I even remember seeing this mentioned somewhere on ELV docs, but I might be wrong.</p> <p>You could insert a schottky diode in the power supply of the receiver to get the supply voltage down. Since it only has an output signal, this should work without any problems. I'd be interested to hear whether it makes any difference in range for you.</p> Short answer: don’t – see http://news.jeelabs.org/2009/02/27/out-of-spec/

Running the ATmega at 3V and 16 MHz is going to be pushing the limits even further. So far, I have not seen any problems with running the ELV receivers at 3.3V – I even remember seeing this mentioned somewhere on ELV docs, but I might be wrong.

You could insert a schottky diode in the power supply of the receiver to get the supply voltage down. Since it only has an output signal, this should work without any problems. I’d be interested to hear whether it makes any difference in range for you.

]]> By: ToMo http://jeelabs.org/2009/10/12/an-ook-relay/#comment-570 ToMo Fri, 23 Oct 2009 06:29:36 +0000 http://news.jeelabs.org/?p=3138#comment-570 <p>Have several ELV-Papers lying around me for checking their wiring diagramms with atmega and FS-20 Receiver. I found out that they all work at 3.0 volt. In the last ELV there was written that the receiver working at 3.0 volt have the best receive-quantity. On the jeenode there is a MCP1702 in 3.3 volt. is it possible to by a MCP1702 in 3.0 volt and to change it on my jeenodes ? What do you think , is the Jeenode working as good with 3 volt instead of 3.3 volt ? Why did you decide to take 3.3 Volt ?</p> Have several ELV-Papers lying around me for checking their wiring diagramms with atmega and FS-20 Receiver. I found out that they all work at 3.0 volt. In the last ELV there was written that the receiver working at 3.0 volt have the best receive-quantity. On the jeenode there is a MCP1702 in 3.3 volt. is it possible to by a MCP1702 in 3.0 volt and to change it on my jeenodes ? What do you think , is the Jeenode working as good with 3 volt instead of 3.3 volt ? Why did you decide to take 3.3 Volt ?

]]> By: Reinhard Max http://jeelabs.org/2009/10/12/an-ook-relay/#comment-524 Reinhard Max Mon, 12 Oct 2009 15:29:58 +0000 http://news.jeelabs.org/?p=3138#comment-524 <p>Why do you think the frequency measuring it wouldn't work in the Netherlands? The change in the Frequency is not willfully created by the UK power companies, it happens in every power grid when supply and demand are not in balance.</p> Why do you think the frequency measuring it wouldn’t work in the Netherlands? The change in the Frequency is not willfully created by the UK power companies, it happens in every power grid when supply and demand are not in balance.

]]> By: jcw http://jeelabs.org/2009/10/12/an-ook-relay/#comment-521 jcw Mon, 12 Oct 2009 08:36:15 +0000 http://news.jeelabs.org/?p=3138#comment-521 <p>Question for you - since this will be a standalone unit which can be placed anywhere, I'm wondering what other functions to add to it.</p> <p>One is a no-brainer: I'd like to add a DCF77 receiver, to broadcast the precise time every minute (great for other nodes to sync their clocks to). Optional, of course.</p> <p>Another one is a decoder for "Decabit" TFcodes, as sent over the power grid, at least in the Netherlands and Germany. These signal the times of night/day power tariff switch-overs, and in some areas also control street lights. I haven't been able to detect/decode these signals so far, but maybe one day someone will figure it out. Tech info at http://www.anime-za.net/tech/ripple_page03.html</p> <p>That leaves two more ports free. We don't <em>have</em> to use them of course, but we could. One idea would be to hook up a yet-to-come LCD plug, and allow this relay to display messages from other nodes.</p> <p>This doesn't seem to work in the Netherlands, only in the UK, unfortunately: http://news.jeelabs.org/2009/05/28/measuring-the-ac-line-frequency/</p> <p>Or maybe add an AC power switching relay, to turn an appliance on and off? Perhaps like this: http://news.jeelabs.org/2009/04/16/switching-ac/</p> <p>Other suggestions?</p> Question for you – since this will be a standalone unit which can be placed anywhere, I’m wondering what other functions to add to it.

One is a no-brainer: I’d like to add a DCF77 receiver, to broadcast the precise time every minute (great for other nodes to sync their clocks to). Optional, of course.

Another one is a decoder for “Decabit” TFcodes, as sent over the power grid, at least in the Netherlands and Germany. These signal the times of night/day power tariff switch-overs, and in some areas also control street lights. I haven’t been able to detect/decode these signals so far, but maybe one day someone will figure it out. Tech info at http://www.anime-za.net/tech/ripple_page03.html

That leaves two more ports free. We don’t have to use them of course, but we could. One idea would be to hook up a yet-to-come LCD plug, and allow this relay to display messages from other nodes.

This doesn’t seem to work in the Netherlands, only in the UK, unfortunately: http://news.jeelabs.org/2009/05/28/measuring-the-ac-line-frequency/

Or maybe add an AC power switching relay, to turn an appliance on and off? Perhaps like this: http://news.jeelabs.org/2009/04/16/switching-ac/

Other suggestions?

]]> By: WWolkers http://jeelabs.org/2009/10/12/an-ook-relay/#comment-520 WWolkers Mon, 12 Oct 2009 08:16:55 +0000 http://news.jeelabs.org/?p=3138#comment-520 <p>Very interesting! just what I need :)</p> Very interesting! just what I need :)

]]> By: ToMo http://jeelabs.org/2009/10/12/an-ook-relay/#comment-519 ToMo Mon, 12 Oct 2009 07:35:39 +0000 http://news.jeelabs.org/?p=3138#comment-519 <p>Great ! I love it !</p> Great ! I love it !

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