BEC
The Battery Eliminator Circuits regulate the battery voltage to 5V while allowing sufficient current to power the servos, Raspberry Pi, and RFD900x.
Qty 2
Primary: Hobby King
Alternative: original mozzie UBEC
The Raspberry Pi, RFD900x and servos should not get power thru the Pixhawk because they can draw too much current.
- The BECs have 5A max continuous output current.
- The RFD900x has ~1A peak consumption, and
- the Raspberry Pi can draw 3A. Raspberry Pi bare-board active current consumption is 600mA. The BEC can power the Raspberry Pi via GPIO pins #4 (5v Power) and #6 (Ground). Pin map here.
The pixhawk will get power from the PM02. It can get backup power from the RFD900 BEC. It can get a second backup power source thru the Rasberry Pi. The maximum total USB peripheral current draw for the RPi is 1.2A (per link above), while the Pixhawk could draw 0.5A (at 5V)).