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Jul 16, 2026
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not-a-wind-tunnel

A wind tunnel reaching up to 5km/hr ***image ***

BOM

2x BFB1012UH Brushless motor 1x ESP32 CYD 1x ESP32 dev board 1x EC11 rotary encoder 1x 300W 12V power supply 1x Rubber band 6x Printed Parts 4x Cardboard boxes 1x Relay 1x Load CellLoad Cell

CAD

(Onshape)[https://cad.onshape.com/documents/cc06dfd869201246dae77957/w/3c359027c53dcaf9ced4e595] see cad folder for other filess

UART to S3

Signal CYD GPIO Direction S3 GPIO
UART TX 27 CYD → S3 11 (RX)
UART RX 22 S3 → CYD 12 (TX)

ESP32-S3 Pinout

All sensors, MOSFETs, and the encoder connect to the S3. The CYD UART is the only external communication.

UART to CYD

Signal S3 GPIO Direction CYD GPIO
UART RX 11 CYD → S3 27 (TX)
UART TX 12 S3 → CYD 22 (RX)

RELAY PWM (fans)

Signal S3 GPIO Peripheral
MOSFET 1 38 LEDC Channel 0
  • Frequency: 2 Hz
  • Resolution: 10-bit (0–1023)
  • Timer: LEDC Timer 0, low-speed mode

HX710B ADC (load sensor)

Signal S3 GPIO Notes
HX1 DOUT 4 ADC #1 data
HX1 SCK 5 ADC #1 clock

EC11 Rotary Encoder

Signal S3 GPIO Notes
ENCODER A 1 Quadrature A
ENCODER B 47 Quadrature B
ENCODER BTN 3 Push-button

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