67 lines
1.9 KiB
Python
67 lines
1.9 KiB
Python
'''
|
|
__ _____ _ _ ____
|
|
\ \ / /_ _| \ | | _ \
|
|
\ \ /\ / / | || \| | | | |
|
|
\ V V / | || |\ | |_| |
|
|
\_/\_/ |___|_| \_|____/
|
|
|
|
|
|
Script to read wind speed from a Davis Anémomètre-girouette Vantage Pro (6410)
|
|
https://www.shapemaker.io/blog/wind-speed-measurements-with-anemometer-and-a-raspberry-pi
|
|
|
|
Connexion:
|
|
black (wind speed ) -> gpio21
|
|
green (wind direction) -> ADS1115 (module I2C)
|
|
Yellow -> 5v
|
|
RED -> GND
|
|
|
|
Attention: The Raspberry Pi doesn't have analog inputs, so we need an analog-to-digital converter (ADC) to read the wind direction.
|
|
|
|
sudo /usr/bin/python3 /var/www/nebuleair_pro_4g/windMeter/read_wind_speed.py
|
|
|
|
'''
|
|
|
|
|
|
import time
|
|
from gpiozero import Button
|
|
from signal import pause
|
|
|
|
# Setup wind speed sensor on GPIO pin 21 (instead of 5)
|
|
wind_speed_sensor = Button(21)
|
|
wind_count = 0
|
|
|
|
def spin():
|
|
global wind_count
|
|
wind_count = wind_count + 1
|
|
|
|
def calc_speed(spins, interval):
|
|
# Davis anemometer formula: V = P*(2.25/T) in MPH
|
|
# P = pulses per sample period, T = sample period in seconds
|
|
wind_speed_mph = spins * (2.25 / interval)
|
|
return wind_speed_mph
|
|
|
|
def reset_wind():
|
|
global wind_count
|
|
wind_count = 0
|
|
|
|
# Register the event handler for the sensor
|
|
wind_speed_sensor.when_pressed = spin
|
|
|
|
try:
|
|
print("Wind speed measurement started. Press Ctrl+C to exit.")
|
|
|
|
while True:
|
|
# Reset the counter
|
|
reset_wind()
|
|
|
|
# Wait for 3 seconds and count rotations
|
|
print("Measuring for 3 seconds...")
|
|
time.sleep(3)
|
|
|
|
# Calculate and display wind speed
|
|
wind_speed = calc_speed(wind_count, 3)
|
|
print(f"Wind count: {wind_count} spins")
|
|
print(f"Wind speed: {wind_speed:.2f} mph ({wind_speed * 1.60934:.2f} km/h)")
|
|
|
|
except KeyboardInterrupt:
|
|
print("\nMeasurement stopped by user") |