'''
Pin names

Name	Description
VCC	Positive voltage
SDA	Digital data pin (input/output)
NC	Not connected
GND	Ground

For Non l2c (SPI): connect both pins 3 and 4 to GND. This disables the I2C interface.
'''

from machine import Pin, SoftI2C
import ssd1306
import dht, time

# Initialize I2C bus
i2c = SoftI2C(scl=Pin(5), sda=Pin(18))
# Initialize OLED display, pixel size 128x64
oled = ssd1306.SSD1306_I2C(128, 64, i2c)

def display_reading(tempC):
    global oled
    oled.fill(0)
    if( tempC is None ):
        oled.text("Updating..",0,0)
    else:
        oled.text("Temperature:", 0, 0)
        oled.text(str(tempC) + "C", 10, 30)
        oled.show()

def start_monitoring():
    
    d = dht.DHT22(Pin(2))
    display_reading(None)
    try:
        while True:
            d.measure()
            tempC = d.temperature()
            print("Temperature is:", str(tempC) , "C")
            display_reading(tempC)
            time.sleep(5)
    except Exception as e: print(e,file=sys.stderr)
    else:
        print('All good. Shutting down.')
    finally:
        print('Finalizing')

if __name__ == '__main__':
    # code to run when file is executed as a script
    start_monitoring()