Stap 2: De software uploaden
De software uploaden naar de arduino voordat u iets anders doet. Let wel op dat de volgende code maakt gebruik van een ethernet-shield en HTTP-verzoek te beantwoorden aan een client (browser). Dus, in de volgende stap zullen we zien dat de server met een HTTP-aanvraag, reageert zoals geschreven staat hieronder. Als u om welke reden een Wi-Fi-schild of iets anders te gebruiken dat dan kunt u de code wijzigen wilt.
De waarde (integer) die de gebruiker krijgt is gewoon wat de sensor detecteert. Dus, eigenlijk zijn niet het vloeistofniveau. MAAR kunt u eenvoudig berekenen van het niveau als u de hypothetische vloeistof volgens de waarde die je net uit de volle tank abstract. Eenvoudige wiskundige vergelijkingen.
/***************************************************************************** An idea for Future Smart Homes Oil Monitoring is a project that lets you monitor the ammount of oil at yourhome. Alerts you with a message on facebook, gmail or even SMS at your personal phone and more important gives you statistics about the past. * Arduino Uno * Ethernet shield and ethernet cable | Wireless shield * UltraSonic Distance Sensor * Wires for arduino pins Developed by Tzivaras Vasilis Last Update: [10-06-2015] *****************************************************************************/ #define echoPin 7 #define trigPin 8 #include <SPI.h> #include <Ethernet.h> // UltraSonic sensor min and max value to be accepted. int maximumRange = 200; int minimumRange = 0; long duration, distance; // Enter a MAC address and IP address for your controller below. // The IP address will be dependent on your local network: byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; IPAddress ip(192, 168, 1, 177); // Initialize the Ethernet server library // with the IP address and port you want to use // (port 80 is default for HTTP): EthernetServer server(80); void setup() { pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); // Open serial communications and wait for port to open: Serial.begin(9600); // start the Ethernet connection and the server: Ethernet.begin(mac, ip); server.begin(); Serial.print("server is at "); Serial.println(Ethernet.localIP()); } void getSensorValue() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); //Calculate the distance (in cm) based on the speed of sound. distance = duration/58.2; } void loop() { // listen for incoming clients EthernetClient client = server.available(); if (client) { Serial.println("new client"); // an http request ends with a blank line boolean currentLineIsBlank = true; while (client.connected()) { if (client.available()) { char c = client.read(); Serial.write(c); // if you've gotten to the end of the line (received a newline // character) and the line is blank, the http request has ended, // so you can send a reply if (c == '\n' && currentLineIsBlank) { // send a standard http response header client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println("Connection: close"); // the connection will be closed after completion of the response client.println("Refresh: 5"); // refresh the page automatically every 5 sec client.println(); client.println("<!DOCTYPE HTML>"); client.println("<html>"); getSensorValue(); client.print("{\"id\":"); client.print("1770,"); client.print("\"measurement\":"); client.print(distance); client.print("}"); client.println("<br />"); client.println("</html>"); break; } if (c == '\n') { // you're starting a new line currentLineIsBlank = true; } else if (c != '\r') { // you've gotten a character on the current line currentLineIsBlank = false; } } } // give the web browser time to receive the data delay(1); // close the connection: client.stop(); Serial.println("client disconnected"); } }
