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temperature and humidity supervision System

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temperature and humidity supervision System in this project temperature and humidity supervision ,this system  is based on arduino as controller and DHT22 sensor interfaced with labview .  first i will begin with the arduino part : to begin with lets connect  the  sensor to the arduino like in the picture below pin 1  to VCC (red wire) pin 2  Data pin with pin 2 inthe arduino (yellow wire ) pin 3 not used  pin 4 to GND (black wire )                               now the arduino code :                    #include <dht.h>  // import library                    dht DHT;                    #define DHT22_PIN 2 // data pin of the DHT22 sensor connected to pin 2           ...
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controle a PWM output in Arduino using LabView

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controle a PWM output in Arduino using LabView What is PWM ? Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. This on-off pattern can simulate voltages in between full on (5 Volts) and off (0 Volts) by changing the portion of the time the signal spends on versus the time that the signal spends off. The duration of "on time" is called the pulse width. To get varying analog values, you change, or modulate, that pulse width. If you repeat this on-off pattern fast enough with an LED for example, the result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED. so to create a PWM signal using arduino you just have to write this line : analogWrite (Pin, nb); Pin : is the PWM output nb is a number between [0 , 255] to determin the Duty cycle now how to control it from labview , y...
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CORDIC Algorithm

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CORDIC Algorithm CO ordinate R otation DI gital C omputer Introduction : Most engineers tasked with implementing a mathematical function such as sine, cosine or square root within an FPGA may initially think of doing so by means of a lookup table , possibly combined with linear interpolation or a power series if multipliers are available. However, in cases like this the CORDIC algorithm also known as Volder's algorithm, is a simple and efficient algorithm to calculate hyperbolic and trigonometric functions, The modern CORDIC algorithm was first described in 1959 by Jack E. Volder. It was developed to replace the analog resolver in the B-58 bomber's navigation computer ,also used in Intel 80x87 coprocessor  and Intel 80486 .      This figure shows the different mode of the cordic algorithm. in our project we are intrested in the circular rotation mode. 1- Rotation of a vector by an angle θ: For the time being, le...
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