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…
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 MoreFour digit BCD 7 segments display and atmega328
As we showed in the previous example the 7 segments display is very easy to manage and is perfect for some aplications which are not many data to display( like temperatures, voltage, currents) sometimes we can combine and display data consecutive. For that we use the model from previous example ELF-511SYGWA/S530-E2. We can see that all the anodes…
Read MoreOne digit BCD 7 segments display and atmega328
7 segments BCD display is very easy to manage and is perfect for some aplications with low data to display. Is made from 7 LEDs mounted in a package like in the pictures below: With this device you can display 0,1,2,3,4,5,6,7,8,9,A,b,C,d,E,F and next we will explain a modality to use the device with arduino or…
Read MoreArduino homemade shield
For this project we want to make a shield for arduino. Because for many times in our project we need to have different inputs(button sensors) and different outputs(LED, motors) we want to bring to minim space used on a breadboard and wires so we try to compact them in a pcb. Parts used in this…
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