from machine import Pin, UART, ADC
import dht, time

# DHT22 on GPIO14
dht_sensor = dht.DHT22(Pin(14))

# LDR on GPIO34
ldr = ADC(Pin(34))
ldr.atten(ADC.ATTN_11DB)  # 0 - 3.3V range

# UART
uart = UART(1, baudrate=9600, tx=Pin(17), rx=Pin(16))

while True:
    try:
        # DHT22
        dht_sensor.measure()
        t = dht_sensor.temperature()  # °C
        h = dht_sensor.humidity()     # %

        # LDR
        ldr_value = ldr.read()        # 0 - 4095

        # CSV message
        msg = "{:.1f},{:.1f},{}\n".format(t, h, ldr_value)

        uart.write(msg)
        print("Sent:", msg.strip())

    except Exception as e:
        print("DHT read error:", e)

    time.sleep(2)