Wiring

Use this page when assembling or troubleshooting the current Veetr prototype. It shows only the connections Veetr uses; you do not need to decode the complete ESP32 pinout.

Before connecting anything: disconnect USB power, check the labels on your exact module revisions, and verify supply voltages with a multimeter. Never connect the wind sensor’s RS485 A or B line directly to an ESP32 pin.

Enclosure connections

With the recessed connector panel facing you, connect the ports from left to right:

Position	Port	Connects to	Notes
1	RJ45	Ultrasonic wind sensor	Carries the wind-sensor cable into the enclosure
2	BLE antenna connector	External 2.4 GHz antenna	Connect before closing the enclosure
3	USB-C	Power bank or development computer	Powers the unit and programs the ESP32
4	GPS antenna connector	External GPS antenna	Uses the thin GPS coaxial lead

Veetr pin map

These are the ESP32 signals used by the prototype:

ESP32 pin	Connected device	Signal	Direction
3V3	IMU and compatible logic modules	3.3 V supply	Power out
GND	All modules	Common ground	—
GPIO21	BNO080/BNO085	I²C SDA	Bidirectional
GPIO22	BNO080/BNO085	I²C SCL	Output
GPIO16	GPS module TX	UART RX	Input
GPIO17	GPS module RX	UART TX	Output
GPIO32	RS485 converter RO	UART RX	Input
GPIO33	RS485 converter DI	UART TX	Output
GPIO14	RS485 converter DE/RE	Transmit/receive enable	Output
GPIO0 / BOOT	Pairing lid control	Pairing/discovery button	Input
EN / RESET	Reset lid control	Controller reset	Input
GPIO2	Status LED	Status indication	Output
GPIO25	Optional masthead LED control	Anchor-light control	Output

IMU wiring

BNO080/BNO085	ESP32
VCC	3V3
GND	GND
SDA	GPIO21
SCL	GPIO22

GPS wiring

UART labels cross over: the GPS transmitter goes to the ESP32 receiver.

GPS module	ESP32
VCC	Supply accepted by your breakout board
GND	GND
TX	GPIO16 / ESP32 RX
RX	GPIO17 / ESP32 TX

Wind sensor and RS485 converter

The converter sits between the wind sensor and ESP32.

Sensor side

Wind sensor	RS485 converter
A or A+	A or A+
B or B-	B or B-
Supply positive	Supply required by the sensor
GND	Common GND

If no data arrives, first confirm the manufacturer’s A/B naming. Some vendors label the differential pair in reverse.

ESP32 side

RS485 converter	ESP32
Logic VCC	Supply supported by the converter and ESP32 logic
GND	GND
RO / receiver output	GPIO32
DI / driver input	GPIO33
DE and RE	GPIO14

Lid controls

The enclosure does not add separate electrical switches. Its two flexible printed tabs press the buttons already fitted to the ESP32 board:

Lid control	ESP32 button	Result
Reset	EN / RESET	Restarts the controller
Pairing	BOOT / GPIO0	Starts the firmware’s pairing/discovery action

Align the ESP32 carefully so each lid tab presses the intended button without holding it down when the lid is installed.

First power-on checklist

1. Inspect for solder bridges, reversed modules, and loose strands.
2. Confirm that every module shares a common ground.
3. Check each module’s supply-voltage label.
4. Leave the external wind sensor disconnected for the first USB power test.
5. Connect USB-C and confirm the ESP32 power indicator behaves normally.
6. Add the IMU and GPS one at a time and check the serial log after each step.
7. Connect the RS485 converter, then the wind sensor last.

For build, upload, and serial-monitor commands, continue to PlatformIO configuration.