Raspberry rotary encoder in Python

 Nothing fancy here, just an adaptation of the code in here to add the switch function in the rotary encoder software.

Connections are like this:

Output will be "UP", "Down" an "click" messages depending on the rotary encoder change, you can then re-use for your own code inside the functions.

I'm using it now to control an SDR receiver (rtl_sdr), might post about it when finished.

The code after the change is this one:

##############

import RPi.GPIO as GPIO
from time import sleep
 
counter = 10
 
Enc_A = 17 
Enc_B = 27 
Enc_SW = 22
 
def init():
    print "Rotary Encoder Test Program"
    GPIO.setwarnings(True)
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(Enc_A, GPIO.IN)
    GPIO.setup(Enc_B, GPIO.IN)
    GPIO.setup(Enc_SW, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
    GPIO.add_event_detect(Enc_A, GPIO.RISING, callback=rotation_decode, bouncetime=10)
    GPIO.add_event_detect(Enc_SW, GPIO.FALLING, callback=swClicked, bouncetime=300)
    return


def swClicked(channel):
#        global paused
#        paused = not paused
        print ("click")  
 
 def rotation_decode(Enc_A):
    global counter
    sleep(0.002)
    Switch_A = GPIO.input(Enc_A)
    Switch_B = GPIO.input(Enc_B)
 
    if (Switch_A == 1) and (Switch_B == 0):
        counter += 1
#        print "direction -> ", counter
        print "UP"
        while Switch_B == 0:
            Switch_B = GPIO.input(Enc_B)
        while Switch_B == 1:
            Switch_B = GPIO.input(Enc_B)
        return
 
    elif (Switch_A == 1) and (Switch_B == 1):
        counter -= 1
#        print "direction <- ", counter
        print "DOWN"
        while Switch_A == 1:
            Switch_A = GPIO.input(Enc_A)
        return
    else:
        return
 
def main():
    try:
        init()
        while True :
            sleep(1)
 
    except KeyboardInterrupt:
        GPIO.cleanup()
 
if __name__ == '__main__':
    main()

##############

As you can see side by side, only some extra lines, all credit to the original code creator.

Have a nice day!