TypeError: unsupported types for gt: 'int', 'NoneType' - Circuit Python [duplicate]

Question

I took an Adafruit code example ([Rotary encoder][1]) for a rotary encoder and changed it in a way that I can control the volume of my PC with a Raspberry Pi Pico as HID.

#
# SPDX-License-Identifier: MIT

import rotaryio
import board
from adafruit_hid.keycode import Keycode
from adafruit_hid.consumer_control_code import ConsumerControlCode

encoder = rotaryio.IncrementalEncoder(board.GP12, board.GP13)
last_position = None

while True:
    position = encoder.position
    
    if last_position is None or position != last_position:
        if position > last_position:
            cc.send(ConsumerControlCode.VOLUME_INCREMENT)
            time.sleep(0.01)
            print("Volume up")
        elif position < last_position:
            cc.send(ConsumerControlCode.VOLUME_DECREMENT)
            time.sleep(0.01)
            print("Volume down")
        else:
            print("No change")
            
    last_position = position


Unfortunately I get the above mentioned error. I found a similar error here on stackoverflow but it couldn't solve the problem for me.

[1]: https://docs.circuitpython.org/en/latest/shared-bindings/rotaryio/index.html

It means last_position is None, and 42 > None makes no sense. You need to handle that case differently and avoid such comparisons. — deceze
– deceze ♦, Commented Jan 24 at 8:01
ok, I understand but why is: if last_position is None or position != last_position valid? Isn't it the same problem here? — Martin
– Martin, Commented Jan 24 at 8:05
No. You can tell that None is not the same as 42. Easy. But can you tell whether None is larger or smaller than 42? Mu. — deceze
– deceze ♦, Commented Jan 24 at 8:20

Martin · Accepted Answer · 2025-01-24 08:13:05Z

0

Setting last_position to 0 solved the problem.

answered Jan 24 at 8:13

Martin

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