sensor_graph/sample_sensor.lua

   1 require('os')
   2 require('string')
   3
   4 last_temp = 0.0
   5 last_light = 0
   6 last_movement = 0
   7
   8 function save_values()
   9   os.execute(string.format("rrdtool update /home/sensordata.rrd -t temp:light:movement N:%f:%d:%d", last_temp, last_light, last_movement))
  10   last_movement=0
  11 end
  12
  13
  14 function parse_value(str)
  15   if string.find(str,"Temp C:") then
  16     last_temp = tonumber(string.sub(str,8))
  17     --print(string.format("t: %f Grad Celsius",last_temp))
  18   end
  19   if string.find(str,"Photo:") then
  20     last_light = tonumber(string.sub(str,7))
  21     --print(string.format("p: %d",last_light))
  22   end
  23   if string.find(str,"movement") then
  24    last_movement=1
  25    --print "something moved"
  26   end
  27
  28 end
  29
  30
  31
  32
  33 local socket = require("socket")
  34 local client = assert(socket.connect("127.0.0.1",2010))
  35 --socket.unix = require("socket.unix")
  36 --local socket = assert(socket.unix())
  37 --local client = assert(socket:connect("/var/run/power_sensor.socket"))
  38 client:settimeout(30)
  39
  40
  41
  42
  43 while 1 do
  44   local line, err = client:receive()
  45   if not err then
  46     parse_value(line)
  47   end
  48   client:send("T")
  49   line, err = client:receive()
  50   if not err then
  51     parse_value(line)
  52   end
  53   client:send("P")
  54   line, err = client:receive()
  55   if not err then
  56     parse_value(line)
  57   end
  58   save_values()
  59 end