He decided instead to use an Arduino to monitor the 3.3V power rail on the Pi. When the Pi is shut down in software, the Arduino can sense that the Pi isn’t on any more and disconnect the power.

It's also a great idea to connect a switch for the battery, so you can turn the power on and off as needed without unplugging the wires. Use the Pin 27 5V pin shahzada farrukh/Shutterstock ...

Unless you live off-the-grid and have abundant free electricity, leaving your rig on while you go away on trips is hardly economic. So if you’re like [Josh Forwood] and you happen to use a re… ...

Turn the LED on and remain on. If you want to turn on the LED then let it remain ON at the button release you just need to get rid of the else statement (as you can see in sketch 2, but you won’t be ...

I made this Arduino project that allows to turn ON and OFF LEDs using a cheap IR remote control as a preparation for the next big step: disassemble my girlfriend’s chinese LED lamp and replace its ...