This PCB is designed to host several breakout boards and to simplify the assembly of a device intended to fit inside a 100 mm PVC tube. Its circular shape allows for direct mechanical integration into the lower part of the enclosure, with no wasted space.

Key features:

• ESP32-S3 (WROOM module) mounted on headers, making replacement or reprogramming easy.

• u-blox NEO-M6 GPS also mounted on headers (plus hot glue for mechanical security).

• All other components (connectors, screw terminals, filters) are directly soldered for robustness.

• Two separate ground planes: one for logic (ESP32, GPS, sensors), one for power (LM2596, servos), connected via a ferrite bead to limit electrical noise between sections.

• LM2596 regulator to provide 5V required by the servos.

• Connector for SPI display (ILI9341 controller).

• SD card reader for data logging.

• Connector for a magnetometer sensor.

• Screw terminals for servos, with MOSFETs for power cut-off.

• USB and JTAG connectors for programming and debugging.

This approach makes it easy to use standard modules (ESP32, GPS) while maintaining a solid, reliable structure suitable for integration in outdoor environments.