from machine import Pin, ADC
import time

sensor = ADC(Pin(34))         # Analog input pin on ESP32
sensor.atten(ADC.ATTN_11DB)   # Full range: 0–3.3V

pump = Pin(15, Pin.OUT)       # Digital output for pump LED

MOISTURE_THRESHOLD = 30

def map_value(x, in_min, in_max, out_min, out_max):
    return (x - in_min) * (out_max - out_min) // (in_max - in_min) + out_min

raw = sensor.read()
moisture = map_value(raw, 4095, 0, 0, 100)
moisture = max(0, min(100, moisture))

if moisture < MOISTURE_THRESHOLD:
    print(f"💧 Moisture: {moisture:.2f}% | Soil is dry. Pump ON.")
    pump.value(1)
else:
    print(f"✅ Moisture: {moisture:.2f}% | Soil is moist. Pump OFF.")
    pump.value(0)