Used scrap to create a meter tall wind turbine with a fan diameter of 2 feet. Used a Raspberry PI Pico connected to a DC motor, IR sensor and a LCD. The LCD displayed the voltage generated from the DC motor and the RPM measured using the IR sensor. Generated ~3 volts when using 1 foot diameter box fan at max speed. Outside, depending on wind, generated up to 5 volts.
Code is attached.
Wiring:
MOTOR:
Motor (+) → 10kΩ resistor → Pin 31 (GP26) → 10kΩ resistor → GND. #Voltage divider to protect Pico
Motor (-) → GND
IR SENSOR:
VCC → 3.3V (Pin 36)
GND → GND
OUT → Pin 20 (GP15)
LCD:
VCC → Pin 40 (5V)
GND → GND
SDA → Pin 1 (GP0)
SCL → Pin 2 (GP1)