Self Shutdown?

I’m having trouble getting my mind around this one.

Is it possible for an Arduino to shut itself off? The only thing I can think of is to connect a transistor to the power source, but then it can’t turn on? Unless the transistor is connected to a “startup battery” and then switched over to a digital out once the Arduino has booted?

How important is it to be truly off?

The Atmega168 chip has a sleep mode where it draws a few microamps. You can have your project turn off any peripherals and then put the chip into sleep mode.

If you use a product like the Pololu pushbutton power switch to deliver power to your Arduino, you can have your device shut off its own power by raising the voltage of the switch's "OFF" pin above 1 V.

  • Ben