How to make a security/ surveillance system for your home with arduino

        Did you know you can make your own  security/surveillance system for your house??? In this project we have made such a system consisting of temperature/humidity sensor(from air), gas/ smoke sensor, movement sensor, humidity(flooding) sensor, buzzer for noise alarm, a keypad to enable/disable some sensors when you are home and a gsm module for moments when you are…

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Sending and receiving messages with SIM800L GSM module and arduino

      First of all here you have sim800 hardware design and here  the AT commands. SIM800L is a quad-band GSM/GPRS module that works on frequencies GSM 850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz. SIM800L features GPRS multi-slot class12/ class 10(optional) and supports the GPRS coding schemes CS-1, CS-2, CS-2, CS-3 and CS-4. The power supply for 800L is between 3.4V…

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How to use a DHT 11 temperature and humidity sensor with arduino

      In this project we will measure the temprature and humidity with the DHT 11 temperature and humidity sensor with an arduino and a 20×4 LCD display. Some characteristics of this sensor are: 1 Can detect  the environmental humidity and temperature 2 Humidity measurement range: 20% 95% humidity 3 Humidity error +-5% 4 Temperature measurement range:0-50 °C 5…

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How to use a PIR sensor with arduino

      A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors. All objects with a temperature above absolute zero emit heat energy in the form of radiation. Usually this radiation is invisible to the human eye because it radiates at infrared wavelengths, but it can be detected by electronic…

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How to use an MQ2 gas sensor with arduino

This sensor use a heater inside and a electrochemical sensor  from SnO2.  According to MQ2  datasheet it is used in gas leakage detecting equipments in family and industry applications, is suitable for detecting of LPG, i-butane, propane, methane, alcohol, hydrogen and smoke. The sensor’s conductivity is more higher along with the gas concentration rising. The datasheet is here. Now  for…

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