- Sun Feb 01, 2015 6:28 am
#8684
Using api.thingspeak.com is easier than I thought. A little adjustment program and graphs are here. The client behaves very well and stably. Get your account and give it a try. This is the path that allows to make a battery powered sensor .
Load program ts_fpdht.lua and dht.lua to ESP8266 with LuaLoader
Load program ts_fpdht.lua and dht.lua to ESP8266 with LuaLoader
Code: Select all
-- Demo thingspeak.com client with sensor DHT11/22
-- Tested with Lua NodeMCU 0.9.5 build 20150127 floating point !!!
-- 1. Flash Lua NodeMCU to ESP module.
-- 2. Set in program ts_fpmdht.lua humidity sensor type. This is parameter typeSensor="dht11" or "dht22".
-- 3. Set in program ts_fpmdht.lua your thingspeak.com write API key
-- 4. You can rename the program ts_fpmdht.lua to init.lua
-- 5. Load program ts_fpmdht.lua and dht.lua to ESP8266 with LuaLoader
-- 6. HW reset module
-- 7. Login module to your AP - wifi.setmode(wifi.STATION),wifi.sta.config("yourSSID","yourPASSWORD")
-- 8. Run program ts_fpmdht.lua - dofile(ts_fpmdht.lua)
-- 9. The sensor is repeatedly read and data are send to api.thingspeak.com every minute.
--10. Minimal period for data send to api.thingspeak.com is 15s
-- The author of the program module dht.lua for reading DHT sensor is Javier Yanez
-- The author of the http client part is Peter Jennings
sensorType="dht22" -- set sensor type dht11 or dht22
WRITEKEY="YourWriteApiKey" -- set your thingspeak.com key
PIN = 4 -- data pin, GPIO2
wifi.setmode(wifi.STATION)
--wifi.sta.config("yourSSID","yourPASSWORD")
wifi.sta.connect()
tmr.delay(1000000)
humi=0
temp=0
fare=0
--load DHT module and read sensor
function ReadDHT()
dht=require("dht")
dht.read(PIN)
if sensorType=="dht11"then
humi=dht.getHumidity()/256
temp=dht.getTemperature()/256
else
humi=dht.getHumidity()/10
temp=dht.getTemperature()/10
end
fare=(temp*9/5+32)
print("Humidity: "..humi.."%")
print("Temperature: "..temp.." deg C")
print("Temperature: "..fare.." deg F")
-- release module
dht=nil
package.loaded["dht"]=nil
end
-- send to https://api.thingspeak.com
function sendTS(humi,temp)
conn = nil
conn = net.createConnection(net.TCP, 0)
conn:on("receive", function(conn, payload)success = true print(payload)end)
conn:on("connection",
function(conn, payload)
print("Connected")
conn:send('GET /update?key='..WRITEKEY..'&field1='..humi..'&field2='..temp..'HTTP/1.1\r\n\
Host: api.thingspeak.com\r\nAccept: */*\r\nUser-Agent: Mozilla/4.0 (compatible; esp8266 Lua; Windows NT 5.1)\r\n\r\n')end)
conn:on("disconnection", function(conn, payload) print('Disconnected') end)
conn:connect(80,'184.106.153.149')
end
ReadDHT()
sendTS(humi,temp)
tmr.alarm(1,60000,1,function()ReadDHT()sendTS(humi,temp)end)
