International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 380 USING RASPBERRY PI TO SENSE TEMPRATURE AND RELATIVE HUMIDITY Shah Vatsal 1 , Mehta Bhavin 2 1 Student,Dept. Of Mechanical Engineering, CHARUSAT, Changa, INDIA 2 Assistant Professor, Dept. Of Mechanical Engineering, CHARUSAT, Changa, INDIA ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract -This paper presents the detection of real time temperature and relative humidity employing raspberry pi. This is a raspberry pi based temperature and humidity logger that uses DHT22 sensor for measurement and it is unique as it not only reads temperature from sensor but also stores data to mysql database and provide means to read that temperature data with any web enabled device (computer,phone)web browser. Python language is used. Key Words: Python, Raspberry pi, DHT22 temperature sensor, mysql database 1.INTRODUCTION Temperature has an impact on almost all the activities surrounding us[2]. A precise determination of temperature and more importantly relative humidity is a vital factor in countless industries and different fields of science. The temperature monitoring is crucial in lot of industries, like food industry, the workshop and pharmaceutical industry. Analog and digital Temperature sensors are available for sensing temperature for commercial purpose. Temperature sensors possessing temperature-dependent properties that can be measured electrically contain resistors, semiconductor mechanisms such as diodes, thermocouples, thermistors. This project aims at monitoring the real time temperature and relative humidity in a cost effective way. Here the monitoring node is raspberry pi. Programming language used for raspberry pi is Python. The Sensor utilized here is DHT22 temperature sensor. This sensor consists of thermistor and basic advantage of using DHT22 sensor is that it is economical and light in weight. The sensor is interfaced with the raspberry pi using jumper wires. The temperature is sensed using the sensor DHT22 and is read, stored and displayed by the raspberry pi kit. 2. Raspberry pi The Raspberry Pi is a low cost, credit-card sized computer which plugs into a computer monitor or TV, and requires a standard keyboard and mouse. Raspberry Pi is a dynamic microcontroller and runs with the Python programming language.Raspberry Pi 2 includes a quad-core Cortex A7 processor CPU running at 900 MHz and 1 GB RAM, Integrated Video core 4 Graphics Processing Constituent (GPU) capable of frolicking Maximum 1080p Elevated Meaning Blu-Ray Quality Video,512Mb SDRAM, The free, flexible and exceedingly builder approachable Debian GNU/Linux(RASPBIAN)Operating System, 2 x USB Ports, HDMI Video Output, RCA Video Output,3.5mm Audio Output Jack,10/100Mb Ethernet Port for Internet Access, 5V Micro USB Domination Input Jack, Micro SDHC card, MMC,40 gpio pins[2]. It has capability of a little device that allows people of all ages to explore computing. It’s capable of doing everything you would expect a desktop/computer to do, from browsing the internet and playing high-definition video to making spreadsheets, word processing, and playing games . The Raspberry Pi has the ability to interact with the outside world, and has been used in a wide array projects like smart home monitoring system, wireless motion sensor activated light and many more. Fig-1: Raspberry pi 2 model b