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output voltage for pixhawk and RPi
pixhawk https://docs.px4.io/main/zh/flight_controller/cuav_pixhawk_v6x.html
operating voltage range is 4.75-5.25V
maximum operating voltage is 5.7V
make voltage on higher end because max operating voltage is higher
around 5.15 volts?
RPi https://datasheets.raspberrypi.com/rpi4/raspberry-pi-4-datasheet.pdf
ideal voltage is 5.1V
absolute max is 5.2 due to usb ratings6V
aim for 5.1/slightly belowhigher
decided on 5.3 voltage due to voltage drop across wires
placement
minimize feedback loop
big puzzle
use common sense
place caps in order of least to greatest from IC
make them easy to connect to one another, either in line, or around a single straight corner
make the power flow easy to read
all components should be relatively easy to spot/ you should know what you’re looking at
board dimensions
37mmx37mm
layout
make traces as small as possible/fewest corners
polygons should have all or mostly 45 degree corners
thermal reliefs on gnd pads of high current pads
LEDs
connectors
big inputs
lock in placement before starting layout, makes everything easier
can also actually lock placement by turning off primitives
what meme should i put?
spongebob and patrick: besties 4evah
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does it step down input to ~5V
test with supply that is within operating range (6~17V)
test with power supply at all these ranges
can it power RPi and Pixhawk
plug them into their respective connectors and find out
does indicator LED turn on
look at it
measure efficiency @ 12V input & 1-3A
plu