Add pull-up resistor configuration and improve code readability

[myhd]

config.h:

• Added comments to clarify the meanings of TRIGGER_TYPE values:
  • RISING = being disconnected
  • FALLING = being connected
• Introduced PULLUP_ENABLED macro to enable or disable the internal pull-up resistor for the input pin
• Updated #endif with a comment for better readability

main.c:

• Added conditional compilation block to enable the internal pull-up resistor if PULLUP_ENABLED is defined
• Improved readability of the while loop by expanding it into multiple lines

[jasonmhite]

All looks acceptable to me, thank you for your contribution!

[jasonmhite]

PS: @myhd what are you using this code for out of curiosity if you don't mind me asking?

[myhd]

PS: @myhd what are you using this code for out of curiosity if you don't mind me asking?

Happy to share: A reed switch on my letterbox flap (outside my house) is opened when mail arrives. This triggers TinyTrigger on a ATTiny, waking up an ESP8266 to connect to my apartment wifi. Using pushover.net, it sends a notification to my phone.

Using your project, the battery for the ESP lasts for months.