PWM

Raspbery pi

Kervi supports software generated pwm on the Raspberry pi’s gpio pins.

from kervi.application import Application
APP = Application()

from kervi.hal import GPIO
GPIO["GPIO10"].define_as_pwm()
GPIO["GPIO10"].start_pwm(30)

PCA9685(I2C)

PCA9685 is a 16 channel pwm generator that may be used to control LEDSs and servos.

PCA9685DeviceDriver(
    address=0x39,
    bus=0
)

address

I2C address. Default is 0x39

bus

I2C bus. If 0 or None default bus for platform is selected.

from kervi.application import Application
APP = Application()

from kervi.devices.pwm.PCA9685 import PCA9685DeviceDriver
pwm = PCA9685DeviceDriver()

#start 10% duty cycle and 40 Hz frequency
pwm[1].start_pwm(10, 40)

#starts pwn and sets duty cycle to 100%
pwm[1].value = True

#stops pwm
pwm[2].value = False

#start pwm and set duty cycle to 50%
pwm[3].value = .5

pwn[3].link_to_dashboard()

APP.run()