Saturday, May 14, 2016

ESP8266 and SHT1x Web Interface


Here's a *duino-less (*pi-less) simple project using ESP11 (ESP8266) Wifi Module and SHT10 humidity-temperature sensor.



init.lua:
wifi.setmode(wifi.STATION)
wifi.sta.config("WIFI_SSID","WIFI_PASSWORD")

local DAT = 4
local CLK = 3

function DL()
  gpio.write(DAT, gpio.LOW)
  gpio.mode(DAT, gpio.OUTPUT)
end

function DH()
  gpio.mode(DAT, gpio.INPUT)
  gpio.write(DAT, gpio.HIGH)
end

function CL()
  gpio.write(CLK, gpio.LOW)
end

function CH()
  gpio.write(CLK, gpio.HIGH)
end

function DR()
  gpio.mode(DAT, gpio.INPUT)
  return gpio.read(DAT)
end

function W8()
  for i = 1, 100 do
    tmr.delay(10000)
    if DR() == gpio.LOW then
      return true
    end
  end
  return false
end

function RB()
  local val = 0
  for i = 0, 7 do
    CH()
    val = val*2 + DR()
    CL()
  end
  return val
end

function shtread(cmd)
  DH() CH() DL() CL() CH() DH() CL()
  for i = 0, 7 do
    if bit.band(cmd, 2^(7-i))==0 then
      DL()
    else
      DH()
    end
    CH() CL()
  end
  CH() CL()
  if not W8() then
    return nil
  end
  DH()
  local val = RB()
  DH() DL() CH() CL() DH()
  val = val*256 + RB()
  DH() CH() CL()
  return val
end

page=[[<head><meta charset="utf-8"/>
<link href="http://projectproto.blogspot.com/favicon.ico" rel="icon"/>
<title>ESP+SHT</title></head>
<body><h1>ESP8266 and SHT1x</h1><h2 id="T">T??</h2><h2 id="H">H??</h2>
<script>
 function update(){
  var xrq = new XMLHttpRequest();
  xrq.onreadystatechange=function(){
   if (xrq.readyState==4 && xrq.status==200){
    var th=JSON.parse(xrq.responseText);
    var t0=th["t"], h0=th["h"];
    var t=(t0*0.01)-39.7;
    var hl=(0.0367*h0)+(-0.0000015955*h0*h0)-2.0468;
    var h=(t-25.0)*(0.01+(0.00008*h0))+hl;
    document.getElementById("T").innerHTML="Temperature: "+t.toFixed(2)+"&deg;C";
    document.getElementById("H").innerHTML="Humidity: "+h.toFixed(2)+"%";}
  }
  xrq.open("GET","/get/sht",true);
  xrq.overrideMimeType("application/json");
  xrq.send(null);
 }setInterval(update, 1000);
</script></body>]]

srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
  conn:on("receive", function(client,request)
    local buf = "";
    local _, _, mtd, path, _ = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
    if(mtd == nil)then
      _, _, mtd, path = string.find(request, "([A-Z]+) (.+) HTTP");
    end
    if path == "/" then
      buf = buf..page
    elseif path == "/get/sht" then
      t = shtread(3)
      h = shtread(5)
      if (t ~= nil and h ~= nil) then
        buf = buf.."{\"t\":"..t..", \"h\":"..h.."}"
      end
    end
    client:send(buf)
    client:close()
    collectgarbage()
  end)
end)





References:
ESP8266 Web Server Tutorial
Github esp8266 sht10
e-Gizmo ESP11 kit
ESP8266 wiki
NodeMCU firmware 
NodeMCU http server

Posted by 'yus at 2:56 PM
Labels: , ,

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