wiki/ avionics/ av3-power

The AV3 power system is currently a hacked LPC2468 GFE on top of a BQ24725 LiPo battery charger chip evaluation board.

hacked LPC GFE pinout

LPC Pin LPC Pin Goes to
P0.03 99 UART0 RXD from LPC (shared with debug and rocketbus connector
P0.10 48 I2C SDA2 to BQ24725 chip.
P0.11 49 I2C SCL2 to BQ24725 chip.
P2.11 52 ACOK from BQ24725: Open drain: pulled up to 5V from BQ 6V regulator ("REGN")
P0.23 09 Imon from BQ24725: Charging current voltage for ADC
P0.05 80 FC power SPS
P0.06 79 ATV power SPS
P0.07 78 Roll Congtrol power to roll control module
P0.08 77 RocketReady to LTC
P0.09 76 WiFi power to WiFi power amp
P0.15 62 Roll Control tether

Serial commands

We have a serial port coming off of the GFE that goes to the umbilical cord. Using a 115200 bps 8N1 serial port into the umbilical, you can send these commands (followed by CR+LF, which is CTRL-M + CTRL-J):

What it does Serial Command
FC on TURNTHEHELLON
FC off WHYAREYOUNOTOFFYET
ATV on GOGOGADGETATV
ATV off ATVSTFUKTHXBAI
WiFi on GOGOGADGETWIFI
WiFi off WIFISTFUKTHXBAI
RC on GOGOGADGETROLL
RC off ROLLSTFUKTHXBAI
RC tether on GOGOGADGETRCTETHER
RC tether off RCTETHERSTFUKTHXBAI

Other notes

THe BQ24725 needs 18V to turn on.