Userguide

2
GENERAL DESCRIPTION
The Super-Watchdog for Raspberry Pi B+, 2, 3, 4 and Zero provides the safety required by mission
critical projects, implementing two major functions. It power-cycle the Raspberry Pi in case of software
lock-up, resetting not only the Pi but also any peripheral attached to it, and it prevents SD-Card failure in
case of power loss, by allowing the Raspberry Pi to shut down itself safely. The 18650 Li-Ion battery can
keep the Raspberry Pi running for hours, assuring continuous operation during power outages.
The watchdog has on board hardware to self check all the major functions. Self check is performed at
each power up. The on-board LED is flashed rapidly (5 times per second) if a hardware error is detected,
or slowly (1 time per second) to indicate normal functionality. The LED is turned on if the watchdog
resets the Raspberry Pi, and off is the Raspberry Pi is powered down for a specific time interval.
The card has a default timeout of 120 seconds. Once installed, if it does not receive a reset from
Raspberry Pi within 2 minutes, it cuts the power and restores it after 10 seconds.