A manually operated contact (S1 in your "diagram") momentarily shorts out the NPN transistor and applies power to the Arduino. MOSFET's circuits that do SW shutdown are available, but no transistor base SW shutdown circuits are to be found anywhere, and the 2N4401 is all that I have right now. I'm sure I lack a lot of knowledge here and I want to know how I could utilize a 2N4401 to make a SW shutdown system. It's as if the transistor isn't reacting to the pin 4 MCU signal at all.Ĭould anyone explain why this is happening? Instead what happens when the short between pin 1 and 3 is cut, the MCU is turned off instantly. When shorting pin 1 and pin 3 on the 2N4401 the MCU is powered on and in-software pin 4 is set to pinMode OUTPUT and HIGHwhich should allow the 2N4401 to let power flow to the MCU for as long as power is available even when the short circuit between 2N4401 pin 1 and 3 is cut. I am trying to understand why connecting, say, an Arduino digital pin 4 to a 2N4401 pin 2 as well as 5V PSU to 2N4401 pin 1 and Arduino VCC to 2N4401 pin 3, won't keep power.
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