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You will lean what PWM is and how you can get the PWM output from the digital pins of Arduino using analogwrite() function.
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About this project
In Arduino PWM Tutorial, you are going to learn about what PWM is and how you can get the PWM output from the digital pins of Arduino. First, we will control thebrightness of LED through code and then we will control it manually by adding the potentiometer.
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What is PWM
PWM stands for Pulse Width Modulation and it is a technique used in controlling the brightness of LED, speed control of DC motor, controlling a servo motor or where you have to get analog output with digital means.
The Arduino digital pins either gives us 5V (when turned HIGH) or 0V (when turned LOW) and the output is a square wave signal. So if we want to dim a LED, we cannot get the voltage between 0 and 5V from the digital pin but we can change the ON and OFF time of the signal. If we will change the ON and OFF time fast enough then the brightness of the led will be changed.
Before going further, let’s discuss some terms associated with PWM.
TON (On Time): It is the time when the signal is high.
TOFF (Off Time): It is the time when the signal is low.
Period: It is the sum of on time and off time.
Duty Cycle: It is the percentage of time when the signal was high during the time of period.
So at 50% duty cycle and 1Hz frequency, the led will be high for half a second and will be low for the other half second. If we increase the frequency to 50Hz (50 times ON and OFF per second), then the led will be seen glowing at half brightness by the human eye.
Arduino and PWM
The Arduino IDE has a built in function “analogWrite()” which can be used to generate a PWM signal. The frequency of this generated signal for most pins will be about 490Hz and we can give the value from 0-255 using this function.
analogWrite(0) means a signal of 0% duty cycle.
analogWrite(127) means a signal of 50% duty cycle.
analogWrite(255) means a signal of 100% duty cycle.
On Arduino Uno, the PWM pins are 3, 5, 6, 9, 10 and 11. The frequency of PWM signal on pins 5 and 6 will be about 980Hz and on other pins will be 490Hz. The PWM pins are labeled with ~ sign.
Controlling Brightness of LED through Code
Firstly, make the connections as described below.
Connect the positive leg of LED which is the longer leg to the digital pin 6 of Arduino. Then connect the 220 ohm resistor to the negative leg of LED and connect the other end of resistor to the ground pin of Arduino.
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Read More: Interfacing LED with Arduino
Now let’s write a code to change the brightness of the LED using PWM.
Arduino Code
Upload the code in the Arduino IDE and the LED will start to fade.
Arduino Code to manually control the Brightness of LED
In the previous connections, add the 10k ohm potentiometer and connect the two ends of potentiometer to 5V and GND of Arduino and then connect the center of potentiometer to the A0 pin of Arduino.
Arduino Code
Upload the code in the Arduino IDE and on moving the knob of the potentiometer, the brightness of the LED will change.
Also Read:
If you have any questions, feel free to ask in the comment section.
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Author
Aqib
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Published on
December 17, 2018
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Table of contents
AMX Line
DESCRIPTION
Solar installations using the AMX 2.0 collectors convert solar energy into useful heat.
The heat produced in the solar collectors is transferred trough the working medium to the water or industrial tank, where it is accumulated. The effective operation of the system is controlled by a differential temperature controller in cooperation with a circulating pump
The unique design of the harp absorber
A flat liquid AMX 2.0 collector has an absorber, which uses modern, so far the only such technology on the market, connection to of the circuit board to the pipe system. This technology involves partial rolling of the copper tube, expanding the size of her surface by a factor of seven.
In the AMX 2.0 collectors is a modern technology to bend the aluminum frame used. The technology consists in making the main frame from one profile section without unnecessary welds in the corners. The frame without joints is much tighter has a more aesthetic appearance and most importantly there is no risk associated with the unsealing after several years of operation.
The unique design
Black housing color of the collector and navy black blue shade visible through the glass, refines the look of any roof.
High efficiency operation
Perfect absorber, smart housing design and a very good thermal insulation of the SX collector makes
him achieves a very high efficiency operation in both summer and winter.
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Can be mounted on any roof
Specially designed mounting assemblies, made of stainless steel and aluminum, ensure quick and safe installation of the solar collectors on every roof with any coating.
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Standards and tests
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The AMX collector was tested in the INTA laboratory in Spain; It was granted the Solar Keymark Certificate.