RPi, PWM over GPIO for spindle speed control

gistfile1.txt

import RPi.GPIO as GPIO
GPIO.setwarnings(False) # needed because GPIO-cleanup can not be used. Setting pin to 1V
GPIO.setmode(GPIO.BOARD) # BCM system, replace BOARD with BCM
GPIO.setup(40,GPIO.OUT) # physical pin 11 will be an output
my_pwm=GPIO.PWM(40,100) # create a PWM object, physical pin, 100 Hz
my_pwm.start(0)        # 50% duty cycle, 1.6V is about half of the 3.3V coming out of the Pi

stopit = False          # varaible to exit the script

while(stopit != True):  # while not True loop
    dutycycle = input("Enter % Duty Cycle: 1 to QUIT ") # user input 0-100 = 0-~3.3V on the pin
    if dutycycle == 1:
        dutycycle = 0   # set PWM to 0% at exit 
        stopit = True   #exit the loop
    my_pwm.ChangeDutyCycle(int(dutycycle)) # change DuCy according to user input 
    print ("DuCy ") + (str(dutycycle)) # just for testing to get some feedback

my_pwm.stop() # not sure if this is needed. Without settin warning to False, warning ot pin beeing used still shows up. It can't harm though. 
print ("Bye-bye")
# GPIO.output(40, 0)       # attempt to set the pin to LOW. Did not work. GPIO-Cleanup makes it 1V 
# GPIO.cleanup()           # release your pins and clean up. Can't be used as it sets the pin to 1V
# exiting withou cleanup

# At boot the pin used for PWM will be at 1V, ~ 31% duty cicle and will trigger the PWM to volage module
# Solution is to "sudo nano /etc/rc.local" and add "pigs modes 21 w" before the "exit 0"
# note that the pin number it set in BCM, not BOARD, so my board pin 40 is addressed here as 21.