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By Swanand Patwardhan

Understanding how a POT works with an Arduino

A potentiometer or POT is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.  To understand how this works with an Arduino, let’s look at a simple example. A value is to be read from the POT and a variable voltage is ...

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By Rajat Bullakkanavar

How do DHT sensors and modules work?

In this blog we explore DHT 11 and DHT22 - The temperature and humidity sensor. Both of these modules are easy to use and inexpensive. DHT 22 is the latest version with more accuracy than DHT 11. A small differentiation between the properties of the two is given below:The difference between these two modules is in the range of temperature and humidity these modules can measure. Also the sampling r ...

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By Swanand Patwardhan

Selecting a resistor for an LED

LED is short for Light Emitting Diode. LEDs have a characteristic called “forward voltage”, which is often shown on data sheets as Vf. This forward voltage is the amount of voltage “lost” in the LED when operated at a certain  reference current, usually defined to about 20mA = 0.020 A. Vf  depends primarily on the colour of the LED but actually varies from LED to LED. ...

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By Rajat Bullakkanavar

How to use a LCD display with Arduino

This blog gives you a basic idea on how a LCD display can be interfaced. With this knowledge you can interface your LED display in whichever project you like.Let us understand a few things about LCD display first.The LCDs have a parallel interface, meaning that the microcontroller has to manipulate several interface pins at once to control the display. The interface consists of the following pins: ...

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By Rajat Bullakkanavar

How do gas sensors work?

In current technology scenario, monitoring of gases produced is very important. From home appliances such as air conditioners to electric chimneys and safety systems at industries monitoring of gases is very crucial. Gas sensors are very important part of such systems.  Small like a nose, gas sensors spontaneously react to the gas present, thus keeping the system updated about any alterations ...

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