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…
Read MoreMonth: June 2016
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…
Read MoreHow to use a humidity sensor with arduino
Almost all of you have at least a plant, or a garden and how many times did you forget to wet them. With this sensor you can observe when the soil is dry, or with a buzzer or a LED arduino can “tell” you this situation. This sensor is very easy to connect to arduino. It can…
Read MoreHow 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…
Read MoreHow 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…
Read MoreHow to protect your arduino output pins with optocouplers
Sometimes using a direct connection between arduino and some devices like transistors, relays etc can damage your pins(think if you have a shortcircuit and your pin drive more than it’s maximum current, around 40mA). So using a optocoupler may be a good idea because this device separate the arduino’s pin and the rest of the circuit,…
Read MoreIndustrial 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:…
Read MoreRF 433 MHz transmitter-receiver module and arduino
These pair of modules is a very cheap alternative for wireless communication. The pair is formed by a transmitter and a receiver like in the picture above and they can be use only with two arduino(or an arduino and one sensor like an open switch for the transmitter). In left we have the receiver and in the…
Read MoreHow to make a clock with an arduino and millis() function
In this project we have made a clock using only arduino and a 20×4 character LCD display. Because arduino give us possibility to count milliseconds through the millis() function, why not to make a clock with it. First to display we choose a 20×4 characters LCD display with a I2C communication(it use only two wires for communication and two for…
Read MoreMeasuring 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…
Read More