The DHT11 is chosen because it is lab calibrated, accurate and stable and its signal output is digital. Most important of all, it is relatively inexpensive for the given performance. Below is the pinout of the sensor.
Read more »IR to RF Converter Circuit
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But IR remote has some limitations like low range and it only works in Line of Sight etc. So these limitations can be overcome by converting the IR signal into RF signal. RF signal does not required line of sight and have much better and long range then IR remote.
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A Lightning Detector for Arduino
http://runtimeprojects.com –
In this tutorial, we will build a lightning detector using an Arduino Uno, a few resistors and some jumper wires. Most lightning detectors often cost too much for the normal hobbyist, however this does not mean one cannot enjoy lightning detection and the physics behind it.
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Windows Remote Arduino Project
https://create.arduino.cc –
In this project, we will use Windows Remote Arduino to turn an LED on and off. It is a simple example, but will reveal the power that the library can give you to create many more advanced projects. Let’s get started!
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8051 Graphic LCD Interfacing
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In this project a Graphical LCD is interfaced with 8051 microcontroller. Here we have shown how to Display an Image on Graphical LCD (GLCD).
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IR Detector Circuit
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IR sensor is very popular sensor, which is frequently used in many applications in electronics, like it is used in Remote control system, motion detector, Product counter, Line follower Robots, Alarms etc. We have already covered complete working of IR sensor here in this article: IR Sensor Module Circuit. IR Sensor basically consists a IR LED and a Photodiode.
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Raspberry Pi LCD Tutorial
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n this tutorial, we will Control a 16x2 LCD Display using Raspberry Pi. We will connect the LCD to GPIO (General Purpose Input Output) pins of PI to display characters on it. We will write a program in PYTHON to send the appropriate commands to the LCD through GPIO and display the needed characters on its screen.
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Scientific Calculator with evive
http://www.instructables.com –
We have built a Scientific calculator having lots of functions like
Basic algebraic operations (+, -, *, %)
Trigonometric functions (SINe, COSine, TANgent)
Inverse trigonometric functions (arcSin, arcCos, arcTan)
Logarithmic function
Square root.
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DC to AC Inverter Circuit
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UPS is a system which converts DC to AC. So, UPS takes DC power of battery as input and gives AC power as output. Today we are going to build a 100 watt 12v DC to 220v AC inverter. This Circuit is simple and very useful.
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Coffee Cup Spy Cam
https://makezine.com –
Take your cup of Joe from classic to classified with a tilt-triggered spy camera.The trick is to modify two paper coffee cups — install the device in one, slide it into the second, and align holes cut in the bottoms of each. Two LEDs can be seen through the standard plastic lid — one illuminates when the tilt switch is activated, the other flashes twice after a picture has been taken.
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