v2 onboard hardware components

some fun v2  onboard hardware components are shown in the image below.

my favorite thing to play with so far are the 3 watchdogs: 

  • 9331 watches the 2560 and can reboot the 2560
  • 2560 watches the 9331 and can reboot the 9331
  • an external mpu supervisory circuit sp703spn watches both the 9331 and 2560 and can power cycle the entire board through the mosfet switch