The term PWM might have come across you if you’re interested in controlling the power output of electronic devices or motors using a Raspberry Pi. PWM is an acronym for Pulse Width Modulation, and it is a method that changes the duty cycle of a square wave signal to control the amount of power delivered to a device.
What is PWM?
Pulse Width Modulation (PWM) is a method used to control the amount of power delivered to an electronic device by turning it on and off rapidly. By adjusting the width of the pulses, we can change the amount of power delivered to the device. This method is widely used in electronic circuits and microcontrollers to control motors, LEDs, and other devices.
How Does PWM Work?
PWM works by turning an electronic device on and off rapidly with a fixed frequency. The ratio of the time the device is on to the time it is off is called the duty cycle. By adjusting the duty cycle, we can control the amount of power delivered to the device. For example, if the duty cycle is 50%, the device will receive power half of the time, and if it is 75%, the device will receive power for 75% of the time.
PWM in Raspberry Pi
You can use the Raspberry Pi, a powerful single-board computer, to control various electronic devices, such as motors, LEDs, and other devices. It has a built-in hardware module that can generate PWM signals, making it easy to control power output. The Raspberry Pi uses the GPIO (General Purpose Input/Output) pins to generate PWM signals.
Using PWM in Raspberry Pi
To use PWM in Raspberry Pi, we need to install a Python library called RPi.GPIO. This library provides a simple interface to control the GPIO pins of the Raspberry Pi. Once installed, we can use the PWM module of the library to generate PWM signals.
First, we need to import the RPi.GPIO library and initialize the GPIO pins. We can do this using the following code:
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(12, GPIO.OUT)In the above code, we have initialized the GPIO pins using the BOARD numbering scheme. We have also set pin 12 as an output pin.
Next, we can create a PWM object using the following code:
pwm = GPIO.PWM(12, 100)In the above code, we have created a PWM object for pin 12 with a frequency of 100 Hz. We can change the frequency as per our requirement.
Once the PWM object is created, we can start the PWM signal using the following code:
pwm.start(50)In the above code, we have started the PWM signal with a duty cycle of 50%. We can change the duty cycle using the following code:
pwm.ChangeDutyCycle(75)In the above code, we have changed the duty cycle to 75%.
Conclusion
PWM is a powerful method to control power output in electronic devices. The Raspberry Pi has a built-in hardware module that can generate PWM signals, making it easy to control various devices.
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