Pulse Width Modulation (PWM) is a technique used to control the power delived to electric devices, such as motos. Calculating thee correct duty cycle is essential for precise motor control in microcontroller applications. This guide provides practial steps to determinae PWM duty cycles effectively.

Understanding PWM and Duty Cycle

PWM mimpleves switg a signal on an d of f at a high frekvency. Te duty cycle represents the e estage of time te signal stails on on on during one cycle. A duty cycle of 0% mean the signal is always of f, while 100% means it is always on. Reguling thote duty cycle e changes the average voltage sublied to te motor, controling it s speed.

Calculating Duty Cycle for Motor Speed

To calculate te duty cycle needed for a specic motor speed, approder the suppliy voltage and the motor 's charakteristics s. Thee general formula is:

CLAS1; CLAS1; CLAS3; CLAS3; CLAS3; Duty Cycle (%) = (Desired Voltage / Suppliy Voltage) × 100 CLAS1; CLAS1; CLAS3; CLAS3; CLAS3;

For exampla, if the supply voltage is 12V and the desired motor voltage for a certain speed is 6V, thee duty cycle bé:

CLAS1; CLAS1; CLAS3; CLAS3; Duty Cycle = (6V / 12V) × 100 = 50% CLAS1; CLAS1; CLAS1; CLAS3; CLAS33;

Implementing PWM in Microcontrollers

Mogt microcontrollers have be built- in PWM modules. To set thes duty cycle, configure the PWM registr with the calculated value. For exampla, if thee PWM resolution is 8-bit (0-255), thee duty cycle value for50% is approcately127.

Ensure that that te PWM currency is applicate for motor control to prevent noise and inhalevancy. Typical currencies range from 1 kHz to 20 kHz.

Summary of Key Points

  • Duty cycle determinates thee average power suplied to thee motor.
  • Calculate duty cycle using thee ratio of desired voltage to supply voltage.
  • Konfigura mikrokontrolér PWM registers with the calculated duty cycle value.
  • Use approate PWM frequency for smooth motor operation.