emonSD-03May16 Release

emonSD
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In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal.[1] In your case the wifi signal

1 Like
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Dear Eric,

that means the 433 Mhz RF strength ?
Why I can’t see my RMS Voltage and current on the chanels?

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Yes in your case the 433 Mhz signal (wifi)

For your other questions, bit hard to guess as I’m really not an expert. I can only try to understand … did you de-activate in the arduino ? no need for this. If no CT is linked it will just send a zero signal.

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Thanks. I going to search answer to my questions in another topic.

Thank you again.

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Just for clarity you mean the RSSI is for the 433MHz RF, 433MHz isn’t WiFi, that’s 2.4 or 5 GHz.

@hunber, The emonTx v2 only has 3 CT inputs and therefore 3 power values, the 4th value is AC voltage scaled x100 so that an integer rather than a float can be transmitted via the RF library JeeLib. Your example above

is actually 245.1 Volts RMS, I’m guessing you may be using the stock emonhub.conf settings on the emonSD which are aimed at the emonTx v3 which has 4 CT’s. Can you confirm the node id of your emonTx v2 and check the settings for that nodeid in the [nodes] section of emonhub.conf, for the emonTx_CT123_Voltage.ino, assuming a node id of 10 you will need an entry like

[[10]]
    nodename = emontx_v2
    [[[rx]]]
       names = power1, power2, power3, vrms
       datacode = h
       scales = 1,1,1,0.01
       units =W,W,W,V

and it must be the only [[10]] in the conf so you may need to comment out or delete any entries that the same node id.

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Dear Paul,

yes, you are right. In the meantime I found this setting, but thanks for the great support.
Thanks for all the quick response.

by Hunber…

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EmonSD-03May16- RELEASE. Does it work for raspberry one? In the documentation talks that works for RasPi 3, 2 Model B +, B, and even Pi zero. Does not mention the raspberry one

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Sorry, what’s a Raspberry Pi one? The image should work on all RasPi’s

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He’s referring to the generation of Raspberry Pis produced prior to the Pi2.
(refered to by some as the Pi 1 to differentiate it from the Pi 2 or Pi 3)

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Both the “Model B and B+” are Pi 1’s so I think he is either referring to a Pi A or maybe even a very early Pi B rev 1 with 256mb of RAM. Both the A and the B rev1 have 256mb RAM so the answer would be the same except for the fact the A has no Ethernet so it would need initializing on a B (B, B+, 2 or 3) to set up a wifi dongle.

Although I haven’t tried it I think 256mb of RAM might be pushing things, half of that is probably taken up with the RO temp files and then there is openhab nodered mosquitto redis sql etc etc.I think some services would need trimming most likely.

[edit] Just for info, The full Raspbian images will pick up a wpa_supplicant.conf file from the /boot partition if there is one there during startup. So using a Pi A with wifi does not ordinarily cause a problem as the wifi details can be added via the PC before putting the card into the Pi, but Jessie-lite doesn’t AFAIK

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maybe this will help…

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Ah yes, model B +. Yup, I have tested the latest image and it works fine (just a but slower) on a model B+ and pi zero. Although you are correct, you would need to setup the wifi manually on Pi zero