# PWM Control Example # # This example shows how to do PWM with your OpenMV Cam. # # # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! # !!! NOTE !!! # THIS IS THE ONLY FREE PIN WHEN USING THE VISION SHIELD. # DO NOT USE ANY OTHER PIN WHILE USING THE VISION SHIELD. # PWM7/PH15 # !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! import time from pyb import Pin, Timer class PWM(): def __init__(self, pin, tim, ch): self.pin = pin self.tim = tim self.ch = ch; pwms = { # 'PWM1' : PWM('PA8', 1, 1), # TIM1 is Reserved. 'PWM2' : PWM('PC6', 3, 1), 'PWM3' : PWM('PC7', 3, 2), # 'PWM4' : PWM('PG7', 0, 0), # HRTIM not supported. 'PWM5' : PWM('PJ11', 8, 2), 'PWM6' : PWM('PK1', 8, 3), 'PWM7' : PWM('PH15', 8, 3), } # Generate a 1KHz square wave with 50% cycle on the following PWM. for k, pwm in pwms.items(): tim = Timer(pwm.tim, freq=1000) # Frequency in Hz ch = tim.channel(pwm.ch, Timer.PWM, pin=Pin(pwm.pin), pulse_width_percent=50) while (True): time.sleep_ms(1000)