Web Based Airpollution Monitoring System Using Samrt Phone
This system have ARM7 LPC2138 is heart of the system. Sensors like temperature, smoke, co, no are interfaced
with microcontroller which is use for the environmental monitoring air pollution and relay for load like fan and LED. The
relay operates on 12v power supply so we are providing this 12volt to relay from secondary side of transformer. The system
designed 5v supply for the module LCD, MAX232, sensors which requires 5v. But controller LPC2138 and Bluetooth
module needs +3.3v that we are providing by using LM1117 IC that is in SMD(surface mount device) package. The
controller continuously reads the value of sensors and displays it on LCD, and by using Bluetooth module these values of
sensors are sent to android mobile. At the mobile side android web server is designed to show the parameters worldwide.
These values are displayed on the mobile window as well as worldwide mobile or PC. Data will be viewed by the any
engineer from any end of the world by this system. If at any time value of temperature sensor will increase by threshold that
we have set 40, FAN will on that is connected as a load to relay. It means if temperature increases relay will on and it will on
the fan. Similarly if value of smoke sensor will cross the threshold value that is 45, relay will on the LED that is visual
indication. And again this increased value will also send to mobile using Bluetooth module. Different sensors are connected
to ARM7 via inbuilt ADC. The output of sensor is containing the information about different parameter values.ARM7 is
connected Bluetooth module through Max232.The Bluetooth module is used to send the data to the Android phone from
Hardware. Android based server &PC are synchronized through same network via same Wi-Fi or keeping hotspot on of
smart phone. The same screen as desktop computer is displayed on the smart phone so that the person from Remote location
also see the current status of various parameters .We will first connect the Android phone &PC. Once the connection is
established the administrator will be able to monitor wireless sensor parameter using the Android phone. Also the
administrator can send report via his smart phone directly to PC.
Keywords— Web Server, Microcontroller, GPS, GSM, Android.