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ESP8266 NodeMCU Interface – DSB1820

WiFi Chip

Code

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local ow_pin =   1 -- gpio-02
ds18b20.setup(ow_pin)
 
-- read all sensors and print all measurement results
ds18b20.read(
    function(ind,rom,res,temp,tdec,par)
        print(ind,string.format("%02X:%02X:%02X:%02X:%02X:%02X:%02X:%02X",string.match(rom,"(%d+):(%d+):(%d+):(%d+):(%d+):(%d+):(%d+):(%d+)")),res,temp,tdec,par)
        print("Temp : "..temp)
    end,{});

 

ESP8266 NodeMCU Module – HTTP

 

 

ESP8266 NodeMCU HTTP Module functions

http.delete() Executes a HTTP DELETE request.
http.get() Executes a HTTP GET request.
http.post() Executes a HTTP POST request.
http.put() Executes a HTTP PUT request.
http.request() Execute a custom HTTP request for any HTTP method.

 

http.delete()

  • Executes a HTTP DELETE request. Note that concurrent requests are not supported.
  • Syntax : http.delete(url, headers, body, callback
  • Parameters
    • url The URL to fetch, including the http:// or https:// prefix
    • headers Optional additional headers to append, including \r\n; may be nil
    • body The body to post; must already be encoded in the appropriate format, but may be empty
    • callback The callback function to be invoked when the response has been received or an error occurred; it is invoked with the arguments status_code, body and headers. In case of an error status_code is set to -1.
  • Returns : nil

 

 

HTTP Get Example

  • Read your thing-speak text file from below code

Code

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station_cfg={}
station_cfg.ssid="ArunEworld"     -- Enter SSID here
station_cfg.pwd="8300026060INDIA"  --Enter password here
server_link = "http://iot.aruneworld.com/httt-get.txt" -- set server URL
 
wifi.setmode(wifi.STATION)  -- set wi-fi mode to station
wifi.sta.config(station_cfg)-- set ssid&pwd to config
wifi.sta.connect()          -- connect to router
 
--Wifi Eent Monitoring file
wifi.eventmon.register(wifi.eventmon.STA_CONNECTED, function(T)
print("\n\tSTA - CONNECTED".."\n\tSSID: "..T.SSID.."\n\tBSSID: "..
T.BSSID.."\n\tChannel: "..T.channel)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, function(T)
print("\n\tSTA - DISCONNECTED".."\n\tSSID: "..T.SSID.."\n\tBSSID: "..
T.BSSID.."\n\treason: "..T.reason)
    tmr.stop(0)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, function(T)
print("\n\tSTA - GOT IP".."\n\tStation IP: "..T.IP.."\n\tSubnet mask: "..
T.netmask.."\n\tGateway IP: "..T.gateway)
tmr.start(0)
end)
 
function GetFromArunEworld()-- callback function for get data
http.get(server_link,'',
function(code, data)
    if (code < 0) then
     print("HTTP request failed")
    else
     print(code, data)
    end
  end)
end
 
-- call get function after each 5 second
tmr.alarm(1, 5000, 1, function() GetFromArunEworld() end)

 

 

HTTP Post Example

Post Data to thinkspeak website

Code

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station_cfg={}
station_cfg.ssid="ssid"     -- Enter SSID here
station_cfg.pwd="password"  --Enter password here
server = "http://api.thingspeak.com/update" -- set server URL
count = 0   -- set initial count to 0
 
 
wifi.setmode(wifi.STATION)  -- set wi-fi mode to station
wifi.sta.config(station_cfg)-- set ssid&pwd to config
wifi.sta.connect()          -- connect to router
 
function PostToThingSpeak() -- callback function for post data
string = "api_key=1EYZIS5OCRJSKZHG&field1="..count
http.post(server,'', string,
function(code, data)
    if (code < 0) then
      print("HTTP request failed")
    else
      print(code, data)
      count = count+1       -- increment count after each successfull post
    end
  end)
end
-- call post function after each 20 second for thingspeak server update
tmr.alarm(1, 20000, 1, function() PostToThingSpeak() end)

 

Post Data to aruneworld Website

code

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station_cfg={}
station_cfg.ssid= "ArunEworld" station_cfg.pwd= "8300026060BLR"
 
wifi.sta.config(station_cfg)
wifi.sta.connect(1)
 
wifi.eventmon.register(wifi.eventmon.STA_CONNECTED, function(T)
print("\n\tSTA - CONNECTED".."\n\tSSID: "..T.SSID.."\n\tBSSID: "..
T.BSSID.."\n\tChannel: "..T.channel)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, function(T)
print("\n\tSTA - DISCONNECTED".."\n\tSSID: "..T.SSID.."\n\tBSSID: "..
T.BSSID.."\n\treason: "..T.reason)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_AUTHMODE_CHANGE, function(T)
print("\n\tSTA - AUTHMODE CHANGE".."\n\told_auth_mode: "..
T.old_auth_mode.."\n\tnew_auth_mode: "..T.new_auth_mode)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, function(T)
print("\n\tSTA - GOT IP".."\n\tStation IP: "..T.IP.."\n\tSubnet mask: "..
T.netmask.."\n\tGateway IP: "..T.gateway)
end)
 
wifi.eventmon.register(wifi.eventmon.STA_DHCP_TIMEOUT, function()
print("\n\tSTA - DHCP TIMEOUT")
end)
 
wifi.eventmon.register(wifi.eventmon.AP_STACONNECTED, function(T)
print("\n\tAP - STATION CONNECTED".."\n\tMAC: "..T.MAC.."\n\tAID: "..T.AID)
end)
 
wifi.eventmon.register(wifi.eventmon.AP_STADISCONNECTED, function(T)
print("\n\tAP - STATION DISCONNECTED".."\n\tMAC: "..T.MAC.."\n\tAID: "..T.AID)
end)
 
wifi.eventmon.register(wifi.eventmon.AP_PROBEREQRECVED, function(T)
print("\n\tAP - PROBE REQUEST RECEIVED".."\n\tMAC: ".. T.MAC.."\n\tRSSI: "..T.RSSI)
end)
 
wifi.eventmon.register(wifi.eventmon.WIFI_MODE_CHANGED, function(T)
print("\n\tSTA - WIFI MODE CHANGED".."\n\told_mode: "..
T.old_mode.."\n\tnew_mode: "..T.new_mode)
end)
  
local function D_Send()
    tmr.wdclr()    
    http.post('https://aruneworld.com.com/post',
    'Content-Type: text/plain\r\n',
    'Hum=23&temp=24',
    function(code, data)
        if (code < 0) then
            print("HTTP request failed")
        else
            print(code, data)
        end
    end)
end
 
local function pin1cb(level)    D_Send()    end
gpio.trig(3,"down", pin1cb) --gpio-0 pin

 

 

 

 

ESP8266 NodeMCU – Build Firmware

Introduction

What is firmware?

  • Firmware is a piece of code for small type of device. The firmware contains binaries, that can do all the works and process.

If you have a questions like following, you can learn all of this questions solutions here.

  1. What is NodeMCU Firmware?
  2. What is the format of NodeMCU Firmware?
  3. What contains the NodeMCU Fimware?
  4. Build Firmware
    1. How to build the NodeMCU Firmware for ESP8266?
    2. How to compile the NodeMCU Firmware for ESP8266?
    3. How to build the NodeMCU firmware from source?
    4. How Build NodeMCU firmware for ESP8266 in Linux Machine?
    5. How Build NodeMCU firmware for ESP8266 using web based Cloud?
    6. how to build NodeMCU firmware on your own?
  5. What are the ESP8266 modules are support this NodeMCU Firmware?
  6. Which ESP8266 modules is best for NodeMCU Firmware?

NodeMCU Firmware

  • NodeMCU firmware is contains many lua modules.
  • Lua modules are contains many lua library files and calling functions.
  • You can select based on your requirement in custom firmware build page.

 

In Linux

 

Web based Cloud Build Custom NodeMCU Firmware

Beginner Recommended Method*

 

Step 1 :

Go-to this site https://nodemcu-build.com/

 

Step 2 :

Two times enter your e-mail address (You will get a status about building the firmware)

 

Step 3 :

Select branch to build from (Recommended choose master always)

Step 4 :

Select modules to include( More than 40+ NodeMCU Lua Modules are available, Select depends upon your application development)

 

Step 5 :

Miscellaneous options (Recommended for beginner : Don’t select any option )

 

Step 6 :

Click Start Your Build button

 

Step 7 :

Open your mail id (What you gave before)

Step 8:

you will get a email about firmware  building started and finished notification. In finished Notification mail you can download float  and integer  type NodeMCU .bin  firmware file.

 

 

 

ESP8266 NodeMCU Interface – ADXL345

WiFi Chip

ADXL345 Means

A    – Analog

D    – Device

X

L

3

4

5

 

Example Code

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    --www.ArunEworld.com
    sda = 2                 -- GPIO-4
    scl = 1                 -- GPIO-5
    print("ArunEworld")
    adxl345.init(sda, scl)              --adxl345.init(sda, scl)
    tmr.delay(3000000)
    print(adxl345.read())
     
    function ADXL_read()
        local x,y,z = adxl345.read()
     
        print(x)
        print(y)
        print(z)
        
        --print(string.format("X = %d, Y = %d, Z = %d", x, y, z))
    end
     
    tmr.alarm(0,1000,1,ADXL_read())

     

 

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