def testPwm(mode, pins):
if mode == "BOARD":
print "Start to test the mode: %s" % (mode)
GPIO.setmode(GPIO.BOARD)
elif mode == "BCM":
print "Start to test the mode: %s" % (mode)
GPIO.setmode(GPIO.BCM)
else:
print "Invalid test mode: %s" % (mode)
for i in pins:
GPIO.setup(i, GPIO.OUT)
p = GPIO.PWM(i, 100) #set freq: 100HZ
p.start(10) #duty cycle: 10%
time.sleep(1)
p.start(100) #duty cycle: 100%
time.sleep(1)
GPIO.output(i, False)
p.stop()
GPIO.cleanup()
We use the program to test variation of duty cycle, and observe the brightness of the leds after running the program.
'''
import LMK.GPIO as GPIO
import time
#----------P3 P5 P7 P8 P10 P11 P12 P13 P15 P16 P18 P19 P21 P22 P23 P24 P26 P27 P28 P29 P31 P32 P33 P35 P36 P37 P38 P40-----------#
phyPins = (3, 5, 7, 8, 10, 11, 12, 13, 15, 16, 18, 19, 21, 22, 23, 24, 26, 27, 28, 29, 31, 32, 33, 35, 36, 37, 38, 40)
bcmPins = (2, 3, 4, 14, 15, 17, 18, 27, 22, 23, 24, 10, 9, 25, 11, 8, 7, 0, 1, 5, 6, 12, 13, 19, 16, 26, 20, 21)
pinNum = 12
frequency = 100 #100HZ
GPIO.setmode(GPIO.BOARD)
GPIO.setup(pinNum,GPIO.OUT)
p = GPIO.PWM(pinNum,frequency)
p.start(0)
try:
while True:
for dutyCycle in range(0,100,5):
p.ChangeDutyCycle(dutyCycle)
time.sleep(0.1)
for dutyCycle in range(100,0,-5):
p.ChangeDutyCycle(dutyCycle)
time.sleep(0.1)
except KeyboardInterrupt:
pass
p.stop()
GPIO.cleanup()
