11 Replies Latest reply on Nov 2, 2016 5:17 AM by oksbwn

    You might not want to monitor your electricity, but I do! Help?

    Christopher Stanton

      Last month I asked people over Twitter and on the element14 Community how you monitored your electrical usage. I was surprised to discover that a lot of people, don't. I'm not to be dissuaded when there's statistics to be had, especially when it's something close to home (oh dear, I'm resorting to puns).

       

      So I have one of these electricity monitors:

       

      IMG_20160601_001125.jpg

       

      That my electric provider gave me, turns out they're really common, except I'm having a hard time determining how to get data out of it. You see, there's an RJ45 socket on the underside of it, which it turns out, dumps serial, but I cannot discover an authoritative answer on its pinout, though it turns out there are cables you can buy that're 'pre-made' for this, apparently it's also 3v3 logic. I decided to make my own:

       

      IMG_20160601_001249.jpg

       

      Part one of my troubles is, how do I work out the correct pinout? Admittedly I am a novice when it comes to using oscilloscopes (and they're too high priced for my tastes) so what's a safe hack-ey way I can go about this? (the USB device in the pic' happens to be a UART type device which usefully has pins on it).

       

      Part two of my troubles, is how shall I handle the data it outputs? About every second, it apparently dumps out XML over serial. Something like this:

       

      <msg>                            start of message

         <src>CC128-v0.11</src>        source and software version

         <dsb>00089</dsb>              days since birth, ie days run

         <time>13:02:39</time>         24 hour clock time as displayed

         <tmpr>18.7</tmpr>             temperature as displayed

         <sensor>1</sensor>            Appliance Number as displayed

         <id>01234</id>                radio ID received from the sensor

         <type>1</type>                sensor Type, "1" = electricity

         <ch1>                         sensor channel

            <watts>00345</watts>       data and units

         </ch1>

         <ch2>

            <watts>02151</watts>

         </ch2>

         <ch3>

            <watts>00000</watts>

         </ch3>

      </msg>                           end of message

       

      I thought that perhaps I should connect it to an ArduinoArduino, or perhaps a Raspberry PiRaspberry Pi? I will need a way to do the following:

       

      • Receive the data and ensure it is legible
      • Store the data so that we can use it
      • Ensure the data is stored at an accurate or relevant timestamp (apparently the device just counts from when it was turned on)
      • Convert the values it gives to something that makes sense
      • Present the values that its stored in ways that are useful and relevant to cost
        • Such as graphs over time

       

      The way I see this being useful, is to correlate the electricity usage with house temperature, external house temperature, and maybe further down the line link in my central heating system, so I'm creating almost a house profile, or prevent something turning on when electricity usage is high (for example, electricity is of course used when the boiler kicks in for the water pump, but I'm getting ahead of myself).

       

      With all this in mind, does this change anyone else's mind about monitoring their electrical usage? Or perhaps someone can give me advice on where to begin with either part of this project? Or should I construct an electricity monitor out of something else entirely?

       

      Thanks for reading!

        • Re: You might not want to monitor your electricity, but I do! Help?
          shabaz

          Hi Christopher,

           

          Interesting project. If the unit autonomously dumps data every second, then perhaps just the TX output from the unit is needed, and not the RX, so if you had a USB-UART adapter then you could probe with the USB-UART-RX input line only, until you saw data on the terminal window.

           

          According to that link however it sounds like pin 8 is the one that will be outputting from the unit.

          I think this arrangement might work, but I'm not sure since I'm just basing it on that thread : ( :

          power-meter-connections.png

          Not that I like recommending FTDI parts : ) but it might be quickest to use that one since it is designed for 3.3V logic levels.  I'm designing a USB UART mini project here 5V UARTs on SBCs?   , maybe you might want to swap some day : )

          [EDIT: oh, just noticed you already have a USB UART. That is fine since it is 3.3V too.].

           

          Regarding software, there are a few challenges, firstly (regardless of programming language) the input needs to be read, but to also know when the entire information has been captured. One method is to set a timeout so if you have no more bytes to read for a certain amount of time then the read function exits and you can start parsing the data. If you're using C then this should be straightforward, there is the 'termios' option value VTIME that can be set appropriately (e.g. to 5 tenths of a second), and probably other languages offer the same thing since their libraries use the same underlying capabilities.

          As an example, there is some code here https://github.com/shabaz123/u1282a_fastlog/blob/master/fastlog.c   , it basically reads from a USB UART too and line 321 of the code is setting to 5 tenths of a second.

          Python will have the same thing I'm sure. There is also the 'expect' library (i.e. libexpect) but that feels like overkill.

          The next challenge is to parse the content, which really depends on how regular the structure is. I quite like just using the standard C++ string library for that, although some would say that is like bringing a knife to a gunfight. But equally there are libraries specifically to parse XML but that might be overkill since there isn't much to be parsed by the looks of it. So perhaps usual string find functions are ok to use, and (say) sscanf for reading in the values into floating point variables.

          Regarding what to do with the data, you could push to a cloud (I don't have any recommendation however) say every 5 minutes or (or simultaneously) plot it in real-time to the display. There is an example here, which uses 'kst': Raspberry Pi 3 Dynamic Current Consumption, Power and Temperature Tests

          To do that, I just got the program to dump data regularly to a file, and then 'kst' would read it every second. Maybe there is no need to worry about file size for about a month, and then possibly save it off (e.g. give it a filename with a timestamp). Or put it into a database, but the basic CSV file method isn't bad, easier too. It would be nice to have some analysis as part of the app though, e.g. the stats for the month, and the same month the previous year, etc. However that is all accoutrements, i.e. phase 2 type stuff maybe.

            • Re: You might not want to monitor your electricity, but I do! Help?
              Christopher Stanton

              9600 baud?

               

              No, that doesn't seem it..

               

              1200 baud?

               

              Hmm, not there yet!

               

              2400 baud?

               

              Hello data! Looks like the pin-out is correct after all.

               

               

              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>22</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00651</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.6</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>28</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00588</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>34</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00591</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>41</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00646</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>47</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.6</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>53</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00582</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.6</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>53</min><sec>59</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00591</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>05</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00590</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>17</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00592</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>23</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00597</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.6</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>29</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>35</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>41</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00622</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>47</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00581</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>53</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00589</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>54</min><sec>59</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>05</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>12</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00601</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>18</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00642</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>24</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00630</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>30</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00611</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>36</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00590</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>42</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00588</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>48</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00588</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>55</min><sec>54</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>00</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00593</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>06</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00625</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>12</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00593</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>18</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00604</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>24</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00589</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>30</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00646</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>36</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00578</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>42</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>56</min><sec>47</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00584</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>00</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>06</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>12</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00592</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>18</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00587</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>24</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00589</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>30</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00578</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>36</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00583</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>42</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00596</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>48</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>57</min><sec>54</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00610</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>00</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>06</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00600</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>12</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00582</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>18</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00614</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>24</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>30</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00648</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>36</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.7</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>22</hr><min>58</min><sec>42</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00588</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
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              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>14</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00586</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>20</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00595</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>26</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00585</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>32</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00579</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>38</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00581</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>45</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00579</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>50</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00606</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              <msg><date><dsb>01343</dsb><hr>23</hr><min>06</min><sec>57</sec></date><src><name>CC02</name><id>01191</id><type>1</type></src><ch1><watts>00605</watts></ch1><ch2><watts>00000</watts></ch2><ch3><watts>00000</watts></ch3><tmpr>20.8</tmpr></msg>
              

               

              It dumps data every 5 seconds by the look of it.

            • Re: You might not want to monitor your electricity, but I do! Help?
              mcb1

              Christopher

              Rather than re-invent the wheel I'd be looking at these guys.

              https://openenergymonitor.org/emon/

               

              I'm aware of a few guys here that have solar and used their monitoring to 'moduate' their hot water cylinder, rather than supply electricity at a very low return.

              I posted a picture of one of their projects here

              Forget Me Not :  eLDERmon  Electrical

              I also pointed out that they nearkly had it right in terms of meeting electrical safety along with a few others that didn't meet anything like safety.

               

               

               

              Mark

              • Re: You might not want to monitor your electricity, but I do! Help?
                oksbwn

                Hi Christopher Stanton if you are interested to give it a try to other meters, you can use smart meters available on market having RS485 interface and they comes with support for MODBUS over RS485 and is a master-slave protocol. this will give a total control over the communication so u can set the data logging time that you desire and these can be used with PC or Pi or Arduino anything having serial interface. I have used quite a lot. In india L&T provides NOVA (Only for info) lineup for such meters, You can check out those.