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electronut/test_HW_PWM.py

Created November 22, 2014 14:42
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For testing the hardware PWM capabilities of the Raspberry Pi Model A+.
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test_HW_PWM.py
"""
test_HW_PWM.py
For testing the hardware PWM capabilities of the Raspberry Pi Model A+.
Author: Mahesh Venkitachalam
Website: electronut.in
"""
import wiringpi2 as wiringpi
import time
print("starting PWM")
# use BCM GPIO numbers
wiringpi.wiringPiSetupGpio()
# enable PWM0
wiringpi.pinMode(18,2)
# 25% duty cycle
wiringpi.pwmWrite(18, 256)
# enable PWM1
wiringpi.pinMode(13,2)
# 75% duty cycle
wiringpi.pwmWrite(13, 768)
# loop
while True:
try:
time.sleep(0.5)
except:
# clean up
wiringpi.pwmWrite(18, 0)
wiringpi.pwmWrite(13, 0)
print("exiting.")
break
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