🔋 Power Saving for Battery Operation

Pico W has several power-saving features for battery-powered sensors.

💤 Light Sleep Mode:

import machine
import time

# Light sleep reduces power to ~1.5mA
print("Going to light sleep for 60 seconds...")
machine.lightsleep(60000)  # Sleep 60 seconds
print("Woke up!")

# After wake, reconnect WiFi and send data
    

📖 Complete Power-Saving Sensor Station:

import network
import urequests
import machine
import time
from machine import Pin, ADC

ssid = "YOUR_WIFI"
password = "YOUR_PASSWORD"
token = "YOUR_TOKEN"

moisture_sensor = ADC(Pin(26))

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    while not wlan.isconnected():
        time.sleep(0.5)

def read_and_send():
    raw = moisture_sensor.read_u16()
    moisture = 100 - (raw / 65535 * 100)
    
    url = "https://api.oceanremote.net/device/state"
    data = f"token={token}&soil_moisture={moisture}"
    
    try:
        response = urequests.post(url, data=data)
        response.close()
        print("Data sent")
    except:
        print("Send failed")

while True:
    # Wake, connect, send
    connect_wifi()
    read_and_send()
    
    print("Going to sleep for 15 minutes...")
    machine.lightsleep(15 * 60 * 1000)