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Wind measurements with Davis anemometer
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| import time | |
| from gpiozero import Button | |
| from signal import pause | |
| import statistics | |
| import pyrebase | |
| import Adafruit_DHT as dht | |
| #The "black" wire (wind speed) of Davis connected to PIN29 as GPIO05 | |
| #the "red" wire (ground) of Davis is connected to PIN39 ground | |
| #the "green" wire (wind direction) of davis is connected to PIN31 as GPIO06 | |
| #the "yellow" wire is connected to 5V PIN02 | |
| DHT_PIN = 4 #for humidity and temperature | |
| db_url = 'https://home-iot-wind.firebaseio.com/' | |
| config = { | |
| "apiKey": "*****************", | |
| "authDomain": "home-iot-wind.firebaseapp.com", | |
| "databaseURL": db_url, | |
| "storageBucket": "home-iot-wind.appspot.com" | |
| } | |
| firebase = pyrebase.initialize_app(config) | |
| db = firebase.database() | |
| wind_speed_sensor = Button(5) | |
| wind_count = 0 | |
| interval = 3 | |
| def spin(): | |
| global wind_count | |
| wind_count = wind_count + 1 | |
| #print("spin" + str(wind_count)) | |
| #time shall be in seconds | |
| def calc_speed(spins, interval): | |
| #based on Davis tech document | |
| # V = P*(2.25/T) the speed is in MPh | |
| # P = no. of 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 | |
| store_speeds = [] | |
| wind_speed_sensor.when_pressed = spin | |
| while True: | |
| start_time = time.time() | |
| print('##### 10-min started #####') | |
| while time.time() - start_time <= 600: | |
| print('Start 3 second') | |
| humidity, temperature = dht.read_retry(dht.AM2302, DHT_PIN) | |
| if humidity is not None and temperature is not None: | |
| print("Temp={0:0.1f}*C Humidity={1:0.1f}%".format(temperature, humidity)) | |
| count_start = wind_count | |
| time.sleep(3) | |
| count_end = wind_count | |
| spins = count_end - count_start | |
| bws_3_sec = calc_speed(spins, 3) | |
| data_3sec = { | |
| "bws-3-sec": bws_3_sec, | |
| "temperature": temperature, | |
| "humidity": humidity, | |
| "timestamp": time.time() | |
| } | |
| #build some path | |
| db.child("home").child("wind").child("3_sec").push(data_3sec) | |
| print('Number of spins: ', spins) | |
| print('Wind speed (mph): ', bws_3_sec) | |
| print('Global count: ', wind_count) | |
| #reset_wind() | |
| #Measure for 10-min | |
| bws_10_min = calc_speed(wind_count, 600) | |
| data_10_min = { | |
| "bws_10_min": bws_10_min, | |
| "temperature": temperature*2, | |
| "humidity": humidity, | |
| "timestamp": time.time() | |
| } | |
| db.child("home").child("wind").child("10_min").push(data_10_min) | |
| print('###### 10-min data #####') | |
| print('Global count: ', wind_count) | |
| print('10-min BWS: ', bws_10_min) | |
| print('##### 10-min END #####') | |
| reset_wind() | |
| """ while True: | |
| start_time = time.time() | |
| while time.time() - start_time <= interval: | |
| reset_wind() | |
| time.sleep(interval) | |
| final_speed = calc_speed(interval) | |
| store_speeds.append(final_speed) | |
| wind_gust = max(store_speeds) | |
| #wind_speed = statistics.mean(store_speeds) | |
| #print(wind_speed, wind_gust) """ | |
| pause() | |
| # Hello from Mender update :) |
Author
Biaggio74
commented
Oct 31, 2021
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