Environmental Parameters Measurement System in Closed Area

Postojeći detektori za uvjete u zatvorenom prostoru su skupi i detektiraju samo jedan parametar. Ovaj rad se bavi izradom bežične senzorske mreže gdje jedan senzorski čvor mjeri više parametara, a to su temperatura (u °C, K i °F), vlažnost zraka te omjer LPG, CO i dima u zraku. Korišteni senzori su DHT11 za temperaturu i vlažnost i MQ2 za plinove. Ukoliko je neki parametar izvan granica normale, čvor svojim alarmima, zvučnim i upozorenjima na LCD zaslonu, upozorava korisnika. Mjerenja se prenose do baznog računala bluetooth putem gdje se emulatorom terminala Tera Term spremaju u JSON dokumente. Takvi dokumenti se zatim ubacuju u bazu podataka CouchDB. Ukupna cijena svih komponenti potrebnih za jedan ovakav senzorski čvor je 270 HRK.Existing detectors for indoors conditions are expensive and detect only one parameter. This paper describes a wireless sensor network where one sensor node measures multiple parameters such as temperature (in °C, K and °F), humidity, ratio of LPG, CO and smoke in the air. The used sensors are DHT11 for temperature and humidity measurement and MQ2 for gas measurement. If any parameter is out of normal value, node will, using his sound and LCD warning alarms, alert the user. The measurements are transmitted to the base computer via bluetooth, where the terminal emulator Tera Term stores them in JSON documents. Such documents are then inserted into CouchDB. The total price of all components needed for such a sensor node is 35,59 € or 39,91 $