Connecting Pico W to WiFi

📶 Connecting Raspberry Pi Pico W to WiFi

📡 What You'll Learn:

🔌 Connect Pico W to WiFi network using MicroPython
📊 Understand WiFi status codes and error handling
⏱️ Set connection timeout to prevent infinite loops
🔐 Store credentials securely for your farm sensors

The Raspberry Pi Pico W has built-in WiFi (unlike the original Pico). This allows you to send sensor data to the cloud, control devices remotely, and build complete IoT farm monitoring systems.

📖 Basic WiFi Connection Code

import network
import time

# ========== WIFI CONFIGURATION ==========
ssid = "YOUR_WIFI_NAME"
password = "YOUR_WIFI_PASSWORD"

# ========== CONNECT TO WIFI ==========
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)

# ========== WAIT FOR CONNECTION (10 second timeout) ==========
print("📡 Connecting to WiFi", end="")
max_wait = 10

while max_wait > 0:
    if wlan.status() >= 3:  # STATUS_GOT_IP = 3
        break
    max_wait -= 1
    print(".", end="")
    time.sleep(1)

# ========== CHECK CONNECTION ==========
print()
if wlan.status() == 3:
    print('✅ Connected to WiFi!')
    print(f'📡 IP Address: {wlan.ifconfig()[0]}')
else:
    print('❌ WiFi connection failed')
    print(f'Status code: {wlan.status()}')
    print('- Status 0: No connection')
    print('- Status 1: Connecting')
    print('- Status 2: Wrong password')
    print('- Status 3: Connected (should be this)')

📊 WiFi Status Codes

Status Code	Constant	Meaning	Action
0	STAT_IDLE	No connection, idle	Check WiFi is enabled
1	STAT_CONNECTING	Connecting in progress	Wait, normal state
2	STAT_WRONG_PASSWORD	Password incorrect	Check your password
3	STAT_GOT_IP	Connected successfully!	Ready to send data
-1	STAT_NO_AP_FOUND	Network not found	Check SSID name
-2	STAT_CONNECT_FAIL	Connection failed	Check signal strength

💡 Best Practices for Farm Sensors:

Connect only when needed: Don't keep WiFi on constantly - connect, send data, disconnect
Use a timeout: Never wait forever for connection (10 seconds is plenty)
Store credentials safely: Use a separate config file for SSID/password
Handle reconnection: If connection fails, retry or go to sleep for next cycle

⚠️ Common WiFi Issues:

Connection timeout: Check signal strength - move closer to router

Wrong password: Verify case-sensitive password (WPA2/WPA3)

5GHz vs 2.4GHz: Pico W only supports 2.4GHz networks

LED not blinking: WiFi module may be disabled - check wlan.active(True)

🎉 Key Takeaways:

✅ Use network.STA_IF for station mode (connecting to router)

✅ Status code 3 = success (STAT_GOT_IP)

✅ Always set a connection timeout (10 seconds max)

✅ Pico W only supports 2.4GHz WiFi networks

✅ Disconnect WiFi when not sending data to save power

💡 Key Takeaways:

Apply these concepts directly to your farm or project.

Take notes on important details for the quiz.

Use the button below to track your progress.

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