Sorry for the confusion, I'm trying to use either the mechanical limit switch OR the ir photogate as a limit switch. Not trying to use both at the same time. But I was unable to use either module using the corresponding UIFlow module integration. I'll post an example next week which hasn't worked for me so far.

Yea, I originally had it in port A but moved it over after confirming there wasn't a negative impact as it's a bit cleaner with both plugs on the same side of the device. If you said there was an electrical difference that could be causing the non-zero reset bug I could try port A again. Any ideas there? Should I be using a different reset / get function? How can I debug this issue better?

Seems pretty clear cut when I'm setting the rotary_value to 0 but when I get the rotary value, it's not 0. It resets to the initial value, which is often not 0. Today I recall three reboots which all had different reset values, roughly 636, -1035, -1.

-1 was close enough and worked for me, but when I got the other values I just reset the board and basically got it to choose a new "0" value.

Yes, I'm following the documentation and guidance on ports. Although I'm finding the Ext-Encoder documentation a bit lacking as far as what the functions do / return.

I have the Ext-Encoder working in Port C and started with both the limit and optical switch in Port B as they list the GPIO port on the label, but started trying other options when that failed to work. I haven't been able to get the optical switch to work and the only way I got the limit switch to work was using the pin directly.

Loving the system, just not sure what I'm doing wrong. I appreciate the help!

Here's my current functional (outside of the non-zero reset bug) code. It's really just an encoder (port C), limit switch (port B), ui elements and minor logic.

import os, sys, io
import M5
from M5 import *
from boot_option import *
from hardware import *
from unit import ExtEncoderUnit
import time
import m5utils



label0 = None
label1 = None
charging = None
Title = None
EncoderValue = None
batteryPerc = None
rect0 = None
buttonState = None
image0 = None
i2c0 = None
pin8 = None
Encoder = None


encoderposition = None
ButtonState = None
Located = None
SliderPosition = None
LocTimer = None
displayTimer = None


def setup():
  global label0, label1, charging, Title, EncoderValue, batteryPerc, rect0, buttonState, image0, i2c0, pin8, Encoder, encoderposition, ButtonState, Located, SliderPosition, LocTimer, displayTimer

  M5.begin()
  Widgets.fillScreen(0x222222)
  label0 = Widgets.Label("Value:", 26, 36, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)
  label1 = Widgets.Label("Limit:", 31, 76, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)
  charging = Widgets.Circle(252, 34, 4, 0x222222, 0x222222)
  Title = Widgets.Title("Slider", 5, 0xffffff, 0x285c4d, Widgets.FONTS.DejaVu18)
  EncoderValue = Widgets.Label("null", 95, 36, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)
  batteryPerc = Widgets.Label("100%", 263, 25, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu18)
  rect0 = Widgets.Rectangle(0, 138, 20, 100, 0x285c4d, 0x285c4d)
  buttonState = Widgets.Circle(102, 86, 7, 0xffffff, 0x222222)
  image0 = Widgets.Image("res/img/logo_cropped.png", 177, 64, scale_x=.07, scale_y=.07)

  set_boot_option(1)
  i2c0 = I2C(0, scl=Pin(18), sda=Pin(17), freq=100000)
  Encoder = ExtEncoderUnit(i2c0, 0x59)
  time.sleep_ms(500)
  Encoder.reset_rotary_value()
  Encoder.set_rotary_value(0)
  Located = False
  pin8 = Pin(8, mode=Pin.IN)


def loop():
  global label0, label1, charging, Title, EncoderValue, batteryPerc, rect0, buttonState, image0, i2c0, pin8, Encoder, encoderposition, ButtonState, Located, SliderPosition, LocTimer, displayTimer
  M5.update()
  batteryPerc.setText(str((str((Power.getBatteryLevel())) + str('%'))))
  if Power.isCharging():
    charging.setColor(color=0x222222, fill_c=0x33cc00)
  else:
    charging.setColor(color=0x222222, fill_c=0x222222)
  encoderposition = Encoder.get_rotary_value()
  EncoderValue.setText(str(encoderposition))
  ButtonState = (pin8.value() ^ (0x01 << 0))
  print(encoderposition)
  if ButtonState == 1:
    Located = True
    buttonState.setColor(color=0xFFFFFF, fill_c=0xFFFFFF)
    Encoder.reset_rotary_value()
    Encoder.set_rotary_value(0)
  else:
    buttonState.setColor(color=0xFFFFFF, fill_c=0x222222)
  if Located == False and (time.ticks_diff((time.ticks_ms()), LocTimer)) > 500:
    print('Location unknown')
    LocTimer = time.ticks_ms()
  SliderPosition = min(max(m5utils.remap(encoderposition, 0, 45140, 298, 0), 0), 298)
  if (time.ticks_diff((time.ticks_ms()), displayTimer)) > 15:
    rect0.setCursor(x=(int(SliderPosition)), y=138)
    displayTimer = time.ticks_ms()


if __name__ == '__main__':
  try:
    setup()
    while True:
      loop()
  except (Exception, KeyboardInterrupt) as e:
    try:
      from utility import print_error_msg
      print_error_msg(e)
    except ImportError:
      print("please update to latest firmware")