rPi power shield

[last updated: 2017-09-24]
GMC GUI project
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power shield Rev-1

power shield Rev-1

schematic

Starting with the (go to:) Adafruit pi hat:

• micro USB connector for 5v power input
• micro USB connector for power out jumper to rPi
• on/off switch
• red LED for input power available
• red LED for power output to rPi
• grn LED for heartbeat
• blu LED for aux
• red LED for aux
• push buttons:
• quit HB program auto-run at boot
• soft shutdown in prep for power off
• soft shutdown and reboot
• aux PB not programmed yet...]
• 555 pulse generator module
• This project uses a Tkinter/Python GUI. I was too low on the learning curve to figure out how to code for periodic updates from the hardware to the UI, but I did manage to code for hardware interrupts, like pushbuttons, so I used this squarewave module to give me an edge transition that I could detect to run an interrupt handler to update UI screen fields.
  (go to:) 555 squarewave generator component page
• yel LED for 555 pulse output

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