Simple wifi web server - barometer with BMP180 sensor
Posted: Mon Jul 27, 2015 1:49 pm
Demo server for I2C barometric sensor BMP180 or BMP085. Driver bmp180.lua is here and core srvbmp180.lua is here .
New lua versions coming applicable!
I like this flasher.
Code: Select all
-- Demo http server for sensors BMP180/BMP085
-- Tested with Lua NodeMCU 0.9.6 build 20150704 floating point only!
-- 1. Flash Lua NodeMCU 0.9.6 build 20150704 floating point to esp8266 module.
-- 2. Login esp8266 module to your AP - wifi.setmode(wifi.STATION),wifi.sta.config("yourSSID","yourPASSWORD")
-- 3. You can rename the program "srvbmp180.lua" to "init.lua" and correct altitude
-- 4. Load program "bmp180.lua" and "srvbmp180.lua" to ESP8266 with a LuaLoader
-- 5. HW reset module
-- 6. Read ip address of module esp8266 from console "= wifi.sta.getip()"
-- 7. Run program "srvbmp180.lua" - dofile("srvbmp180.lua")
-- 8. Test it with your browser and true IP address of module.
-- 9. The sensor is repeatedly reading every 10s
--11. Data on http page are auto refreshed every 10s too.
--12. The pictures on page are external.
--**************************************************************
alti=170 -- set correction for your altitude location in meters
--**************************************************************
wifi.setmode(wifi.STATION)
--wifi.sta.config("yourSSID","yourPASSWORD")
wifi.sta.connect()
sda=4 -- GPIO2 connect to SDA BMP180
scl=3 -- GPIO0 connect to SCL BMP180
pres=0 -- pressure
temp=0 -- temperature
fare=0 -- temperature
oss=0 -- over sampling setting
--load BMP module for reading sensor
function ReadBMP()
bmp180 = require("bmp180")
bmp180.init(sda, scl)
bmp180.read(oss)
pres = bmp180.getPressure()/100+alti/8.43
temp = bmp180.getTemperature()/10
fare=(temp*9/5+32)
print("Pressure: "..string.format("%.1f",pres).." hPa")
print("Temperature: "..string.format("%.1f",temp).." deg C")
print("Temperature: "..string.format("%.1f",fare).." deg F")
print(" ")
-- release module
bmp180 = nil
package.loaded["bmp180"]=nil
end
-- First reading data
ReadBMP()
-- Periodic reading of the sensor
tmr.alarm(1,10000,1, function()ReadBMP()end)
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
conn:on("receive",function(conn,payload)
--print(payload) -- for debugging only
strstr={string.find(payload,"GET / HTTP/1.1")}
if(strstr[1]~=nil)then
--generates HTML web site
conn:send('HTTP/1.1 200 OK\r\nConnection: keep-alive\r\nCache-Control: private, no-store\r\n\r\n\
<!DOCTYPE HTML>\
<html><head><meta content="text/html;charset=utf-8"><title>ESP8266</title>\
<meta http-equiv="refresh" content="10;url=/"></head>\
<body bgcolor="#ffe4c4"><h2>Barometer with I2C sensor<br>BMP180 or BMP85</h2>\
<h3><font color="green">\
<IMG SRC="http://esp8266.fancon.cz/bmp180/bar.gif"WIDTH="64"HEIGHT="64"><br>\
<input style="text-align: center"type="text"size=6 name="j"value="'..string.format("%.1f",pres)..'"> Atmos. pressure hPa<br><br>\
<IMG SRC="http://esp8266.fancon.cz/bmp180/tmp.gif"WIDTH="64"HEIGHT="64"><br>\
<input style="text-align: center"type="text"size=4 name="p"value="'..string.format("%.1f",temp)..'"> Temperature grade C<br>\
<input style="text-align: center"type="text"size=4 name="s"value="'..string.format("%.1f",fare)..'"> Temperature grade F</font></h3>\
<h6>Tested with Lua NodeMCU<br> 0.9.6 build 20150704 float!</h6>')
end
conn:on("sent",function(conn) conn:close() end)
end)
end)