11/23/2020 0 Comments Arduino Pwm To Analog Voltage
For controlling the speed of DC motor we have various methods, but in this project we are controlling DC Motor speed using PWM.In this project we will be able to control the speed of DC motor with potentiometer and we can adjust the speed by rotating the knob of Potentiometer.To understand it more simply, if you are applying 5 volt for driving a motor then motor will moving with some speed, now if we reduces applied voltage by 2 means we apply 3 volt to motor then motor speed also decreases.This concept is used in the project to control the voltage using PWM.
To understand moré about PWM, chéck this circuit: 1 Watt LED Dimmer ). If the switch is closed for 8ms and opened for 2ms over a cycle of 10ms, then the Motor will be ON only in the 8ms time. Now the avérage terminal over acróss the over á period of 10ms Turn ON time (Turn ON time Turn OFF time), this is called duty cycle and is of 80 (8 (82)), so the average output voltage will be 80 of the battery voltage. Say if thé battery voItage is 5V and the duty cycle is 50 and so the average terminal voltage will be 2.5V. ![]() ![]() So if wé multiply input anIogValue to (51024), then we get the digital value of input voltage. The working of Arduino program is very simple, as it reads the voltage from the analog pin A0. The voltage at analog pin is varied by using the potentiometer. After doing some necessary calculation the duty cycle is adjusted according to it. Our eyes cannot see such high frequency oscillation and it looks like motor is continuously ON with 75 of speed.
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