Smart pushbutton power switch

I bought a mini pushbutton power switch board, and I&#;m trying to wire it so I can re-use the push-button as a sensor to an Arduino so it can read the button state and perform a controlled shutdown.

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My goal is that when the Arduino is off, an external pushbutton wired to the A pin will short to ground, turning the Arduino on. Then, when someone presses the external pushbutton again, the Arduino will register the key-press, do some internal cleanup, and then set OFF pin high to turn itself off.

This is the simplest way I thought I could accomplish this behavior:

I found I had to add the diode because when the pushbutton board latches on, the A pin appears to stay shorted to ground, causing the Arduino&#;s SB pin to always register low, regardless of the external pushbutton state, meaning the Arduino could never tell when the external pushbutton was pressed again.

However, this circuit still doesn&#;t work. The problem I&#;m now having is that the pushbutton board immediately turns &#;on&#; and stays stuck &#;on&#;. Even setting the OFF pin to high has no effect. How do I fix this circuit?

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Understanding the differences: Momentary vs Latching push button switches 

The choice between a momentary and a latching push button switch largely depends on the functionality required in the circuit and the expected user interaction with the switch.  

The comprehensive table below details a side-by-side comparison of Momentary versus Latching push button switches. Discover key insights into their functionality, applications, and advantages to seamlessly integrate into your systems.  

Whether you&#;re upgrading existing configurations or spearheading new innovations, this guide is designed to enhance your decision-making process, ensuring you select the perfect switch that aligns precisely with your project&#;s demands. 

To sum up, here&#;s a table comparing momentary and latching switches: