ESP8266 Community Forum

- Sat Mar 07, 2015 8:14 pm #11559 Hey everyone!

First, I've found this website lovely and informative, esp as a newbie delving into the ESP8266. Thanks for all your contributions!

I have a project where i would like to get live sensor data. I also need a RESTful response to control the output of a few GPIO ports. I have the webserver working, but it doesn't refresh the sensor data on the page. I have looked at several examples, but I do not have enough understanding of how to refresh the output on the page, as i've tried adding the tmr.alarm, changed how the connection closes, etc, so here is my code and i'd love it if someone could point out what i should do.

Code: Select allwifi.setmode(wifi.STATION)
wifi.sta.config("----","-----")
print(wifi.sta.getip())
led = 1;
light = 0;
showlight="XX"
bimb=1
gpio.mode(led, gpio.OUTPUT)

function ReadADC()
     light = adc.read(0)
     showlight=(light)
     print("light:    "..showlight.."%")
end

ReadADC()
tmr.alarm(1,6000, 1, function() ReadADC() bimb=bimb+1 if bimb==50 then bimb=0 wifi.sta.connect() print("Reconnect")end end)

srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = "";
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<h1> ESP8266 Web Server</h1>";
        buf = buf.."<p>LED <a href=\"?pin=ON1\"><button>ON</button></a>&nbsp;<a href=\"?pin=OFF1\"><button>OFF</button></a></p>";
        buf = buf..'<p>ADC <input style=\"text-align: center\"type=\"text\"size=4 name=\"j\"value=\"'..showlight..'\"> % of relative light<br><br></p>';
        local _on,_off = "",""
        if(_GET.pin == "ON1")then
              gpio.write(led, gpio.HIGH);
        elseif(_GET.pin == "OFF1")then
              gpio.write(led, gpio.LOW);
        end
        if(light > 100)then
              buf = buf.."<p>Light is ON</p>";
        elseif(light < 100)then
              buf = buf.."<p>Light is OFF</p>";
        end
        client:send(buf);
        client:on("sent",function(conn) conn:close() end)
        collectgarbage();
    end)
end)

Thanks!

- Sun Mar 08, 2015 3:48 pm #11601 Do you think something like that?

Code: Select allwifi.setmode(wifi.STATION)
--wifi.sta.config("----","-----")
led = 1;
light = 0;
showlight="XX"
gpio.mode(led, gpio.OUTPUT)

function ReadADC()
     light = adc.read(0)
     showlight=(light)
     print("light:    "..showlight.."%")
end

srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = "";
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
      buf = buf..'"<meta http-equiv="refresh" content="2;url="http://'..ip..'>';
        buf = buf.."<h1> ESP8266 Web Server</h1>";
        buf = buf.."<p>LED <a href=\"?pin=ON1\"><button>ON</button></a>&nbsp;<a href=\"?pin=OFF1\"><button>OFF</button></a></p>";
        buf = buf..'<p>ADC <input style=\"text-align: center\"type=\"text\"size=4 name=\"j\"value=\"'..showlight..'\"> % of relative light<br><br></p>';
        local _on,_off = "",""
        if(_GET.pin == "ON1")then
              gpio.write(led, gpio.HIGH);
        elseif(_GET.pin == "OFF1")then
              gpio.write(led, gpio.LOW);
        end
        if(light > 100)then
              buf = buf.."<p>Light is ON</p>";
        elseif(light < 100)then
              buf = buf.."<p>Light is OFF</p>";
        end
        client:send(buf);
        client:on("sent",function(conn) conn:close() end)
        collectgarbage();
    end)
end)


tmr.alarm(0,1000, 1, function() if wifi.sta.getip()~=nil then tmr.stop(0) print(wifi.sta.getip()) ip=wifi.sta.getip() else print("Reconnect")end end)
tmr.alarm(1,6000, 1, function()  ReadADC() print(showlight) end)


- Sun Mar 08, 2015 4:39 pm #11607

I have the webserver working, but it doesn't refresh the sensor data on the page.

You can't force page updates to a browser. The browser has to request them. So setup a timer and a JavaScript call in the page source to get the new values as often as you want.