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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Industrial reflex sensor and arduino

      Because most of sensors used with arduino are made as shields, in these project we will use a wenglor  HB03PBT7 sensor. These wenglor industrial  sensor detect distance by measuring angles. The color, shape and surface characteristics of the object have practically no influence on sensor switching performance. The most important characteristics are: Range: 10-30mm Supply voltage:10-30VDC Type:…

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Measuring temperature with an arduino and an NTC thermistor

This method to measure the temperature is very cheap and precise enough to be utilized in many applications. A thermistor is a type of resistor whose resistance is dependent on temperature, more so than in standard resistors. There are two types of thermistors NTC(negative temperature coefficient) and PTC(positive temperature coefficient). If resistance increase with increasing temperature we have a PTC thermistor, if resistance…

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