Element14 DIY Pi Desktop, User Manual, Page: 15 / 22

V4.0
Element14 | element14.com/PiDesktop 15
GPIO2 RTC_SDA/MCU_SDA SDA for both the RTC and MCU
GPIO3 RTC_SCL/MCU_SCL SCL for both the RTC and MCU
GPIO26 INT_MCU A GPIO connected to the MCU (reserved)
GPIO19 NRST_MCU Used by the MCU
3.2 Power Control
The power to your PiDesktop can be controlled in two ways; pressing the power button
on the PiDesktop or using a command line or GUI.
PiDesktop Power Button
OPERATION ACTION
Turn on Press the power button
Shutdown Hold the button pressed for approx. 2 seconds
Forced Shutdown Hold the button pressed for about approx. 5 seconds to cutoff
power regardless of any other conditions
Command Line & GUI
A reboot command can be sent from the command line or GUI. During the reboot
process the LED will flash. When the system has finished the shutdown process it will
automatically restart. During restart LED will be consistently on, not blinking.
Running the shutdown command from the command line or GUI will command the LED
flash for 30 seconds before shutting off, at which point the power to the PiDesktop will
be cut.
Safe Power Control
NOTE: Directly cutting power to the RPi can cause damage to the board, therefore the
PiDesktop must perform safe startup and shutdown procedures.