YouLess

The [YouLess LS110] is a kWh meter to ethernet bridge, which detects the turns of the rotor disc or LED-pulses of an electricity meter. These turns or flashes are proportional to a certain amount of electric energy used. This information is being logged and can be sent to a website like [Bidgely]. It can also be queried from a networked device on the local network (via http) to get real-time power consumption.

Data format

For local queries (via http) there is a number of data formats available:

Plain text

Page "a" (e.g. http://192.168.1.14/a ) will return some data in plain text:

 4456,980 kWh
 457 Watt
 0%
 OK (13)

JSON format

Page "a?f=j" will return this info plus some extra in JSON format:

 {"cnt":"4457,005","pwr":453,"lvl":0,"dev":"","det":"","con":"OK","sts":"(52)","raw":0}

• cnt: counter in kWh
• pwr: Pwer consumption in Watt
• lvl: moving average level (intensity of reflected light on analog meters)
• dev: deviation of reflection
• con: connection status
• sts: Time until next status update with online monitoring
• raw: raw 10-bit light reflection level (without averaging)

Please note that the kWh-data may have one or two leading zeros when the count is below 100 kWh. For example:

 {"cnt":" 22,285","pwr":764,"lvl":0,"dev":"","det":"","con":"OK","sts":"(06)","raw":0}

Historical data

The source of page "R" contains some links to pages with historical data. For example, "V?m=1" will show the kWh values for januari in plain text and "V?m=1&f=j" will display this in JSON format.

 {"un":"kWh",
 "tm":"2012-01-01T00:00:00",
 "dt":86400,
 "val":["  0,000","  7,200","  8,000","  8,200","  6,600","  7,900","  8,600"," 10,600",
 "  6,200","  7,000","  8,200","  5,100","  8,900","  5,900","  7,300","  7,400",
 "  6,900"," 12,200","  6,700","  8,500","  7,100","  7,700","  1,300","  8,500",
 "  5,500","  7,700","  7,500"," 10,200","  8,100","  6,300","  4,100",null]}

This sample (output without newlines) contains the following information:

• unit: kWh
• start time: 2012-01-01T00:00:00
• delta time (time between samples): 86400 seconds (1 day)
• an array with values for each (recorded) day (array is null-terminated)

Resolution of historical data

Probably due to memory limitations, the historical data is stored with a larger interval when it's further back in time.

Power usage in kWh per:

• day of month
  • url = http://192.168.1.14/V?m=2
  • m = the number of month (jan = 1, feb = 2, ..., dec = 12)
• hour of day
  • url = http://192.168.1.14/V?d=1
  • d = the number of days ago (today = 0, yesterday = 1, etc.)
• 10 minutes
  • url = http://192.168.1.14/V?w=1
  • w = 1 for the interval now till 8 hours ago.
  • w = 2 for the interval 8 till 16 hours ago.
  • w = 3 for the interval 16 till 24 hours ago.
• 1 minute
  • url = http://192.168.1.14/V?h=1
  • h = 1 for the interval now till 30 minutes ago.
  • h = 2 for the interval 30 till 60 minutes ago.

N.B. each url can be complemented with "&f=j" to get the JSON-version of the data. Note that some values may contain leading spaces.

Cacti script

For logging purposes like Cacti, a script only needs to output a number on one line. This will just do that:

 #/bin/bash
 wget http://192.168.1.14/a -q -O - |grep kWh|sed s/\ kWh//|sed s/\,/\./|sed s/^\ //

This will output something like this:

 15.971