Getting Error: Failed to add edge detection on DFrobot 3.7 Li Battery Fule Gaugge
Pojitha.Hettiarachchilalage 2024-06-19 20:37:49 47 Views2 Replies Recently i have bought 5 Fuel Gauge for my project , Im trying to connect with my pi but am ending up with this error ;
python3 demo_read_and_int.py
Traceback (most recent call last):
File "/home/pi/DFRobot_MAX17043/python/raspberry/examples/demo_read_and_int.py", line 29, in <module>
GPIO.add_event_detect(7, GPIO.FALLING, callback = interruptCallBack, bouncetime = 5)
RuntimeError: Failed to add edge detection
Please Help me to solve this problem thank you.
The error message you're encountering (RuntimeError: Failed to add edge detection) suggests that there is an issue with setting up edge detection on GPIO pin 7 of your Raspberry Pi. This error typically occurs when there is a conflict or incorrect setup in the way the GPIO pin is configured for edge detection interrupts.
Here are some steps and considerations to help resolve this issue:
Check GPIO Pin Setup:
Ensure that GPIO pin 7 (or whichever GPIO pin you're using for the Fuel Gauge interrupt) is correctly configured and available for edge detection. GPIO pins on the Raspberry Pi can have different capabilities, so make sure GPIO 7 supports edge detection.Verify GPIO Pin Number:
Double-check that the GPIO pin number (in your case, 7) matches the actual pin you are using on your Raspberry Pi. Use the pinout diagram for your specific Raspberry Pi model to confirm GPIO pin numbering.Check GPIO Access Permissions:
Make sure your script has the necessary permissions to access the GPIO pins. Typically, this involves running your Python script with sudo or ensuring that your user has been added to the gpio group.
After running this command, log out and log back in to apply the group membership.
bash
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sudo usermod -aG gpio <your_username>
Ensure GPIO Library Installation:
Ensure that you have the RPi.GPIO library installed and up to date. You can install it using pip if you haven't already:
bash
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sudo pip3 install RPi.GPIO
Review GPIO Pin Configuration:
Before calling GPIO.add_event_detect, make sure the GPIO pin is correctly set up as an input using GPIO.setup:
Ensure this setup code is executed before you attempt to add the event detection.
python
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import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) # or GPIO.BOARD depending on your pin numbering scheme GPIO.setup(7, GPIO.IN, pull_up_down=GPIO.PUD_UP) # or GPIO.PUD_DOWN if you're using a pull-down resistor
Bounce Time Consideration:
The bouncetime parameter in GPIO.add_event_detect is set to 5 milliseconds (bouncetime = 5). This parameter prevents interrupt events from being triggered multiple times due to mechanical or electrical noise. Ensure this value is appropriate for your application and the behavior of your interrupt signal.Test with Minimal Code:
Sometimes, conflicting code or incorrect pin configuration elsewhere in your script can cause issues. Try running a minimal example with just GPIO setup and the GPIO.add_event_detect function to isolate the problem.Here’s a basic example structure of how your code should look:
python
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import RPi.GPIO as GPIO import time # Callback function def interruptCallBack(channel): print("Interrupt detected on channel {}".format(channel)) # GPIO setup GPIO.setmode(GPIO.BCM) # or GPIO.BOARD depending on your pin numbering scheme GPIO.setup(7, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Adjust pull_up_down as necessary GPIO.add_event_detect(7, GPIO.FALLING, callback=interruptCallBack, bouncetime=5) try: while True: time.sleep(1) except KeyboardInterrupt: GPIO.cleanup()
Make sure to adapt the GPIO pin numbers and settings (GPIO.BCM vs GPIO.BOARD and GPIO.PUD_UP vs GPIO.PUD_DOWN) according to your specific setup.
If you continue to experience issues after checking these steps, consider providing more details about your setup (Raspberry Pi model, how the Fuel Gauge module is connected, etc.) for further assistance. This additional information can help diagnose the problem more accurately.https://www.heisener.com/
JAMES.JACK The bouncetime parameter specifies the length of time (in milliseconds) for which the script ignores further edges after the first edge detection. Ensure that bouncetime value (5 in your case) is appropriate for your application and hardware setup.
lia.ifat 