How Frequency Changing Occurring in Buzzer When it is Connected to GPIO Pin

The GPIO pin’s outputs are either high or low value, isn’t it? So, how will it process the digital value between 0-225 and change the frequency? And why only the digital range of 0-225 and not up to any other number.

GPIO pins are digital and can only output high (logic 1) or low (logic 0) values. They cannot directly process values between 0-225 or change frequency. The range of 0-225 is likely arbitrary and specific to the context or requirements of the system using the GPIO pins.

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Hi, @tahseen

GPIO pins in most microcontrollers or single-board computers, like the Raspberry Pi, indeed have digital outputs that can be either high (typically represented as 1 or True) or low (typically represented as 0 or False). The GPIO pins are designed to work with binary signals, which means they can only output these two states.

To understand how a digital value between 0 and 225 can be used to change the frequency, we need to consider the context in which it is being used. In many cases, the digital value represents a control signal that is used to modulate the behavior of a specific component or subsystem.

For example, let’s consider the case of PWM (Pulse Width Modulation) signals. PWM is a technique where a digital signal with a fixed frequency is varied by changing the ratio of the on-time to the total period. By changing this duty cycle, the perceived intensity or speed of a device can be controlled.

In the context of changing frequency, a digital value between 0 and 225 could be used to represent the duty cycle of a PWM signal. A value of 0 would indicate a 0% duty cycle (always off), a value of 225 would indicate a 100% duty cycle (always on), and intermediate values would correspond to different duty cycle percentages. By varying the duty cycle, the perceived frequency can be changed.

The range of 0-225 is likely chosen in the specific example you mentioned based on the desired granularity or resolution of control. Using a wider range of values can provide more fine-grained control over the frequency or intensity being controlled. However, the actual range and resolution of control may vary depending on the specific system or application requirements.

It’s important to note that the range of 0-225 is just an example and may not be applicable in all situations. The actual range and interpretation of digital values can vary depending on the specific hardware, programming framework, or communication protocol being used.

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Thank you for taking the time to provide such a detailed and informative answer. Your explanation has greatly clarified my understanding of the topic. I truly appreciate your help and expertise!
Got to learn a new word PWM ; - )

I think the digital range is 0-255 here. An analog input can be a range, typically from 0V to the source voltage. So, a digital chip with 8-bit resolution will convert analog input to an 8-bit digital signal of range 0-255 (2^8=256, Binary means base 2 and power is the 8 bit part and 256-1=255 since it starts from 0). Maybe that’s why it’s 0-255.