scd40ThingSpeakLEDDHT11.py

import time
import board
import adafruit_scd4x
import requests
import RPi.GPIO as GPIO
import dht11

# Initialising GPIO pins
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

# Assigning and Initialising LED pin
led_pin = 27
GPIO.setup(led_pin, GPIO.OUT)

# Assigning and Initialising DHT 11
myDHT = dht11.DHT11(pin=17)

# Initialising the I2C communication with Raspberry Pi
i2c = board.I2C()
scd4x = adafruit_scd4x.SCD4X(i2c)
print("SCD40 Sensor Serial no:", [hex(i) for i in scd4x.serial_number])
# Starting Low periodic measurement.
scd4x.start_low_periodic_measurement()
print("Measuring CO2, Temperature and Humidity Values....")

# ThingSpeak endpoint and API KEY
API_ENDPOINT = "https://api.thingspeak.com/update"
API_KEY = "9MB5PUUHD6AKTA8Z"


def sendDataToCloud(CO2, temperature, humidity, current_time):
    print(CO2)
    print(temperature)
    print(humidity)
    print(current_time)
    print()

    # Creating payload with data and API key
    payload = {
        "api_key": API_KEY,
        "field1": current_time,
        "field2": temperature,
        "field3": humidity,
        "field4": CO2
    }

    # Sending HTTP POST type request to ThingSpeak
    response = requests.post(API_ENDPOINT, params=payload)

    # Printing response status code
    print("Data sent to ThingSpeak Cloud. Status Code:", response.status_code)


def blink_led(num_times, delay):
    print("LED blink intruction arrived")
    for _ in range(num_times):
        GPIO.output(led_pin, GPIO.HIGH)
        time.sleep(delay)
        GPIO.output(led_pin, GPIO.LOW)
        time.sleep(delay)


while True:
    result = myDHT.read()
    if result.is_valid():
        print("Temp: %d °C" % result.temperature +
              ' ' + "Humid: %d %%" % result.humidity)
    if scd4x.data_ready:
        t = time.localtime()
        current_time = time.strftime("%H:%M:%S", t)
        print("current time %s " % current_time)
        print(f"CO2: {scd4x.CO2} ppm")
        print(f"Temperature: {scd4x.temperature:.1f} °C")
        print(f"Humidity: {scd4x.relative_humidity:.1f} %")
        print()
        sendDataToCloud(scd4x.CO2, scd4x.temperature,
                        scd4x.relative_humidity, current_time)
        if scd4x.temperature > 23 or scd4x.relative_humidity > 70 or scd4x.CO2 > 900:
            blink_led(num_times=2, delay=0.7)
            print("LED blink sent")
        print("sleeping...")
        time.sleep(5)