The scenario
A drone builder needs a clean PCB wiring reference for a 4S LiPo-powered flight controller with ExpressLRS radio, GPS, and compass modules.
What is in this drawing
Read the decisions behind it.
01
Used two voltage regulators to step 14.8V battery voltage down to 5V and 3.3V rails
02
Connected ExpressLRS receiver over CRSF UART instead of SBUS for lower latency
03
Added 10k pull-up resistors on I2C compass SDA/SCL lines
Applies when designing or documenting a drone flight controller PCB that integrates a long-range radio, satellite positioning, and magnetometer.
More like this