ESP8266 Community Forum

Posted: **Sat Oct 03, 2015 5:36 pm**

I'm trying to make a standalone cheerlights receiver using NodeMCU instead of a RaspberryPi (as it will be a lot cheaper

I've put together this code to read one of the cheerlights feeds
http://api.thingspeak.com/channels/1417 ... /last.json
but I'd like to make it poll every 60 secs and I'm just going around in circles trying to understand how to do this
Can anyone help please?

Simon

Code: Select all

-- get current cheerlights colour
print("Setting the device up as a STATION")
wifi.setmode(wifi.STATION)

print("Connecting to the AP")
wifi.sta.config("CYCY", "")
wifi.sta.connect()

print("Waiting a little bit to get an IP address...")

function main()
    sk=net.createConnection(net.TCP, 0)
    sk:on("receive", function(sck, c)
        field2 = string.find(c, 'field2')
        if field2 ~= nil then
            pkt = string.sub(c,field2 + 10,field2 + 15)
            print ("pkt:" .. pkt)
        end
    end )
    
    sk:connect(80,"144.212.80.11")
    sk:send("GET /channels/1417/field/2/last.json HTTP/1.1\r\nHost: api.thingspeak.com\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
end


tmr.alarm(1, 1000, 1, function() 
   if wifi.sta.getip()=="0.0.0.0" or wifi.sta.getip() == nil then
      print("Connect AP, Waiting...") 
   else
      print("Wifi AP connected. Wicon IP:")
      print(wifi.sta.getip())
      main()
      tmr.stop(1)
   end
end)

Posted: **Sun Oct 04, 2015 5:09 am**

As I was waiting for my post to be approved - I came up with a working method

Code: Select all

-- get current cheerlights colour
conn = "" 
print("Setting the device up as a STATION")
wifi.setmode(wifi.STATION)

print("Connecting to the AP")
wifi.sta.config("CYCY", "")
wifi.sta.connect()

print("Waiting a little bit to get an IP address...")

function main()
    sk=net.createConnection(net.TCP, 0)
    conn = sk
    sk:on("receive", function(sck, c)
        field2 = string.find(c, 'field2')
        if field2 ~= nil then
            pkt = string.sub(c,field2 + 10,field2 + 15)
            print ("pkt:" .. pkt)
        end
    end )
    
    sk:connect(80,"144.212.80.11")
end


tmr.alarm(1, 1000, 1, function() 
   if wifi.sta.getip()=="0.0.0.0" or wifi.sta.getip() == nil then
      print("Connect AP, Waiting...") 
   else
      print("Wifi AP connected. Wicon IP:")
      print(wifi.sta.getip())
      main()
      tmr.stop(1)
   end
end)

tmr.alarm(2, 60000, 1, function() 
    conn:send("GET /channels/1417/field/2/last.json HTTP/1.1\r\nHost: api.thingspeak.com\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
end)

Posted: **Mon Oct 05, 2015 4:40 pm**

Also, note that you can use the ThingSpeak API to get the last color as a text string.

http://api.thingspeak.com/channels/1417/field/2/last.txt

This might be easier to use and parse.

Posted: **Wed Oct 07, 2015 10:43 am**

I'd forgotton about that feed

Ta
Simon

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