Table of Contents
Calculating the duty cycle is essential for generating accurate signals in microcontroller applications. It determines the proportion of time a signal remains high within a cycle, affecting device performance and power consumption.
Understanding Duty Cycle
The duty cycle is expressed as a percentage and indicates how long a signal stays active during one cycle. A 50% duty cycle means the signal is high for half the period and low for the other half.
Calculating Duty Cycle
The basic formula for duty cycle is:
Duty Cycle (%) = (Time High / Total Period) × 100
To calculate the duty cycle, measure the duration the signal stays high and divide it by the total period of the signal. Multiply the result by 100 to get the percentage.
Practical Application
Microcontrollers often use Pulse Width Modulation (PWM) to control devices like motors and LEDs. Adjusting the duty cycle allows precise control over power delivery and brightness.
For example, if a PWM signal has a period of 1 millisecond and stays high for 0.6 milliseconds, the duty cycle is:
(0.6 ms / 1 ms) × 100 = 60%
Summary
Calculating the duty cycle involves measuring the high time of a signal relative to its total period. Accurate calculations enable effective control of electronic components in microcontroller projects.