In this illustration we will going to wire the W5100 Ethernet shield with Arduino UNO, DHTXX Humidity Sensor along with ThingSpeak an AJAX Graphical Representation of the data coming from the Sensor which is connected to our MCU and push the data to ThingSpeak Server, See below the diagram.
The diagram below works only by port forwarding for running thingspeak locally on your machine you need to install Ruby 2, RubyGems, Rail 4, GitHub, and DBMS (MySQL) running on Linux OS, the best way to test this is by installing virtual box running with Ununto Operating System , please follow this link.
Thngspeak fresh installation on Ubuntu Distro.
> sudo apt-get upgrade
> sudo apt-get -y install build-essential mysql-server mysql-client libmysqlclient-dev libxml2-dev libxslt-dev git-core curl rubygems
>\curl -sSL https://get.rvm.io | bash -s stable
>rvm install 2.1
>git clone https://github.com/iobridge/thingspeak.git
>cd thingspeak
>bundle install
>cp config/database.yml.example config/database.yml
>rake db:create
>rake db:schema:load
>rails server
Thningspeak will now be running at http://localhost:3000/
As you can see the above the Ethernet shield is connected to the router and then from the router it communicates to the ThingSpeak IOT Server.
Below are the wiring diagram and steps how to used ThingSpeak IOT Server.
Wiring the DHTXX Humidity sensor module is quite simple just place the data pin to Analog Pin 0 AO on our MCU board then supply with 5v DC and place the ground the common ground which is on our Arduino Board.
Sketch Code
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#include <SPI.h> #include <Ethernet.h> // Local Network Settings byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // BIA or Physical mac address of W5100 Shield byte ip[] = { 192, 168, 1, 100 }; // IP ADDRESS of your device byte gateway[] = { 192, 168, 1, 1 }; // internet access via router byte subnet[] = { 255, 255, 255, 0 }; // 24bit Subnet Mask //EthernetServer server(80); //server port //byte gateway[] = { 192, 168, 0, 1 }; //Internet access via router //byte subnet[] = { 255, 255, 255, 0 }; //24 Bit Subnet Mask //byte myserver[] = { 208, 104, 2, 86 }; // zoomkat web page server IP addre // ThingSpeak Settings char thingSpeakAddress[] = "api.thingspeak.com"; String writeAPIKey = "Mwrite_API_key"; const int updateThingSpeakInterval = 25 * 1000; // Time interval in milliseconds to update ThingSpeak (number of seconds * 1000 = interval) // Setup the variable long lastConnectionTime = 0; boolean lastConnected = false; int failedCounter = 0; // Initialize Ethernet Client EthernetClient client; #include <DHT.h> #define DHTPIN A0 // Analog 0 which is the sensor will be place #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22 DHT dht(DHTPIN, DHTTYPE); float te, te0; float has, has0; int te1, te2; int has1, has2; void setup() { // Start Serial for debugging on the Serial Monitor Serial.begin(9600); // start the Ethernet connection and the server: Ethernet.begin(mac, ip, gateway, subnet); // server.begin(); Serial.print("server is at "); Serial.println(Ethernet.localIP()); dht.begin(); // Humidity Sensor Initialize // Start Ethernet on Arduino startEthernet(); } void loop() { // Read value from Analog Input Pin 0 // String analogValue0 = String(analogRead(A0), DEC); te = dht.readTemperature(); // read temperature te0 = 10*te; // multiplied with 10 te1 = te0/10; // integer value te2 = te0 - te1*10; // value after point if (te2<0) te2=-te2; // if temperature is negative has = dht.readHumidity(); has0 = 10*has; has1 = has0/10; // integer value has2 = has0 - has1*10; // value after point //String analogValue0 = String(te, DEC); //String analogValue1 = String(has, DEC); String analogValue0 = String(te1, DEC); analogValue0 += "."; analogValue0 += String(te2, DEC); String analogValue1 = String(has1, DEC); analogValue1 += "."; analogValue1 += String(has2, DEC); //String analogValue0 = String(24.5, DEC); //String analogValue1 = String(37, DEC); // Print Update Response to Serial Monitor if (client.available()) { char c = client.read(); Serial.print(c); } // Disconnect from ThingSpeak if (!client.connected() && lastConnected) { Serial.println("...disconnected"); Serial.println(); client.stop(); } // Update ThingSpeak if(!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval)) { // updateThingSpeak("field1="+analogValue0); updateThingSpeak("field1="+analogValue0+"&field2="+analogValue1); } // Check if Arduino Ethernet needs to be restarted if (failedCounter > 3 ) {startEthernet();} lastConnected = client.connected(); } void updateThingSpeak(String tsData) { if (client.connect(thingSpeakAddress, 80)) { client.print("POST /update HTTP/1.1\n"); client.print("Host: api.thingspeak.com\n"); client.print("Connection: close\n"); client.print("X-THINGSPEAKAPIKEY: "+ writeAPIKey +"\n"); client.print("Content-Type: application/x-www-form-urlencoded\n"); client.print("Content-Length: "); client.print(tsData.length()); client.print("\n\n"); client.print(tsData); lastConnectionTime = millis(); if (client.connected()) { Serial.println("Connecting to ThingSpeak Server"); Serial.println(); failedCounter = 0; } else { failedCounter++; Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")"); Serial.println(); } } else { failedCounter++; Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")"); Serial.println(); lastConnectionTime = millis(); } } void startEthernet() { client.stop(); Serial.println("Connecting to current network please wait..."); Serial.println(); delay(1000); // Connect to network amd obtain an IP address using DHCP if (Ethernet.begin(mac) == 0) { Serial.println("DHCP Failed, reset the device and try again"); Serial.println(); } else { Serial.println("Connected to network w/d DHCP"); Serial.println(); } delay(1000); // Delay at 1 Seconds } |
