When the gas sensor detects gas, the LED light will be on.
When the gas sensor detects gas, the phone will buzzes and then send SMS to the specific people.
Here is the video:
Hardware:
Arduino UNO WIFI
Gas Sensor
Led
Software:
App Inventor
1. Arduino UNO WIFI:
Reference:
http://www.arduino.org/learning/getting-started/getting-started-with-arduino-uno-wifi
http://www.arduino.org/learning/tutorials/boards-tutorials/webserver
Gas sensor: analog 0;
LED: Pin 13;
.ino file:
#include <Wire.h>
#include <ArduinoWiFi.h>
/*
on your borwser, you type http://<IP>/arduino/webserver/ or http://<hostname>.local/arduino/webserver/
http://www.arduino.org/learning/tutorials/webserver
*/
void setup() {
Wifi.begin();
Wifi.println("WebServer Server is up");
pinMode(13, OUTPUT);
}
void loop() {
if (analogRead(0) > 500)
{
digitalWrite(13, HIGH);
}
else
{
digitalWrite(13, LOW);
}
while(Wifi.available()){
process(Wifi);
}
delay(50);
}
void process(WifiData client) {
// read the command
String command = client.readStringUntil('/');
if (command == "webserver") {
WebServer(client);
}
}
void WebServer(WifiData client) {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
client.println("Refresh: 20"); // refresh the page automatically every sec
client.println();
client.println("<html>");
client.println("<head> <title>UNO WIFI Example</title> </head>");
client.print("<body>");
int analogChannel = 0;
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is (");
client.print(sensorReading);
client.print(")");
client.print("<br/>");
client.print("</body>");
client.println("</html>");
client.print(DELIMITER); // very important to end the communication !!!
}
2. App Inventor:
User Interface:
Components:
Blocks:
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