GPIO Interrupt not recognized on OP-5B

[thatsimonsguy]

I've been struggling to get interrupt to work on my 5b with a water flow sensor. Any suggestions or help is appreciated.

 

Here's what I've tried and validated so far:

• Hardware:
  • The flow sensor signal wire is connected to wiringpi pin 2, which is physical pin 7, gpio pin 54
  • I've put in a pull-down resistor between the gpio pin and GND
  • I've confirmed with a multi-meter that the signal line has a voltage of 0 when the sensor isn't spinning.
    • I've confirmed that "gpio read 2" shows the pin as 0 in that state
  • I've confirmed that the signal line voltage peaks to around 1.5 vdc when the sensor is spinning.
    • I've confirmed that "gpio read 2" shows the pin pulsing in that state between 1 and 0.
• Docker:
  • I've exported gpio 54 and set it to in
  • The container runs in privileged mode with volumes to all the important bits mapped
• Python:
  • I wrote a stupidly simple script just to increment a counter and print its value when the interrupt is called
  • wiringpi correctly reads and sets values for all the other gpio stuff I'm doing on the board (temp sensors and relays), it's only the interrupt job that isn't working

 

Docs for above assertions:

• Python script:

  import wiringpi
  import time
  
  # The pin number to which your sensor is connected
  SENSOR_PIN = 2
  
  # Initialize wiringpi
  wiringpi.wiringPiSetup()
  
  # Set the pin to input mode
  wiringpi.pinMode(SENSOR_PIN, wiringpi.GPIO.INPUT)
  
  # Initialize the counter and the tick
  counter = 0
  
  
  def count_pulse():
      global counter
      counter += 1
      print(counter)
  
  
  # Set the interrupt to be triggered when the pin's voltage rises from LOW to HIGH
  wiringpi.wiringPiISR(SENSOR_PIN, wiringpi.GPIO.INT_EDGE_RISING, count_pulse)
  
  # To keep the script running
  try:
      while True:
          time.sleep(1)
  except (KeyboardInterrupt, SystemExit):
      print(f'Total pulses: {counter}')
      print('Exiting...')

   

• GPIO test output:

  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 1
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0
  Pin 2 state: 0

   

• Dockerfile:

  FROM python:3.9-slim
  WORKDIR /usr/src/app/squirtgun
  LABEL maintainer="github.com/thatsimonsguy"
  
  # Prep for downloading and installing wiringOP & wiringOP-python
  RUN apt-get update && apt-get install -y \
      git \
      gcc \
      swig \
      python3-dev \
      python3-setuptools \
      make \
      sudo \
      && rm -rf /var/lib/apt/lists/*
  
  # Set up wiringOP
  WORKDIR /usr/src/app/squirtgun
  RUN git clone https://github.com/orangepi-xunlong/wiringOP.git -b next
  WORKDIR /usr/src/app/squirtgun/wiringOP
  RUN ./build clean
  RUN ./build
  
  # Set up wiringOP-Python
  WORKDIR /usr/src/app/squirtgun
  RUN git clone --recursive https://github.com/orangepi-xunlong/wiringOP-Python -b next
  WORKDIR /usr/src/app/squirtgun/wiringOP-Python
  RUN python3 generate-bindings.py > bindings.i
  RUN python3 setup.py install
  
  # Export GPIO for pin 2
  RUN echo 54 > /sys/class/gpio/export
  RUN echo "in" > /sys/class/gpio/gpio54/direction
  
  # Install app and python deps
  WORKDIR /usr/src/app/squirtgun
  COPY . .
  RUN pip install -r requirements.txt
  
  EXPOSE 80
  ENTRYPOINT ["python", "run.py"]

   

• Docker compose:

  version: '3'
  services:
    squirtgun_test:
      image: squirtgun_test:latest
      privileged: true
      volumes:
        - squirtgun_config:/usr/src/app/squirtgun/config
        - squirtgun_db:/usr/src/app/squirtgun/db
        - /etc/orangepi-release:/etc/orangepi-release
        - /etc/armbian-release:/etc/armbian-release
      environment:
        - REGISTRATION_OTP=####
        - PARENT_BASE_URL=####
        - ZONE_RELAY_PINS=5
        - TRANSFORMER_RELAY_PIN=7
        - TEMP_SENSOR_PIN_1=8
        - TEMP_SENSOR_PIN_2=9
        - FLOW_SENSOR_PIN=2
        - DEBUG_NO_MTLS=True
      ports:
        - "5000:5000"
  volumes:
    squirtgun_config:
    squirtgun_db:

 

 

(I realize the port mapping between the docker compose and the dockerfile are not aligned. That's on my TODO list, but isn't a factor for this problem. I'm testing by exec'ing into the running docker container after build and executing the test script)

 

Cheers and thanks!

Edited August 1, 2023 by thatsimonsguy