Simple Button Circuit to Power ON & Safely OFF Raspberry PI скачать в хорошем качестве

Simple Button Circuit to Power ON & Safely OFF Raspberry PI

Pretty cool one here I came up with. Starting with this simple latch circuit I talked about a while back:    • Simple Transistor Latch Circuit + Eas...   NOTE! Put a 1k resistor right at the base of those two NPN transistors. You never want to have two transistor bases tied together like that. I wanted to use this to power up my raspberry Pi project, which is pretty easy, but I also wanted to use this to power down as well. Since you can't just kill power suddenly to the Pi, I enabled GPIO21 to go HIGH after a safe shutdown: sudo nano /boot/config.txt Adding in this line at the end: dtoverlay=gpio-poweroff,gpiopin=21 Then from the processing sketch be able to monitor that same pushbutton and determine when to execute the shutdown command. That code zipped up here: http://kevindarrah.com/download/laser... And the pinout for the GPIO Header: https://pinout.xyz Oh and make sure to check out the last video on exactly how I got the Pi setup the way you see it in this video:    • Raspberry Pi - MASSIVE TUTORIAL - Fre...   Check out my Tindie store (trigBoard is available) https://www.tindie.com/stores/kdcircu... Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen!   / kdarrah   Twitter:   / kdcircuits   For inquiries or design services: https://www.kdcircuits.com