Raspberry Pi Pico W Complete Setup Guide¶

Get your Pico W running with OceanRemote - MicroPython & Arduino

📦 What You'll Need¶

Item	Notes
Raspberry Pi Pico W	Must be W version (WiFi capable)
USB cable	USB-A to micro-USB (data sync capable)
Computer	Windows/Mac/Linux
WiFi network	2.4GHz only

🐍 Option 1: MicroPython (Easier, Recommended)¶

Step 1: Download MicroPython Firmware¶

Download from: https://micropython.org/download/rpi-pico-w/

Choose the latest .uf2 file.

Step 2: Flash Firmware to Pico W¶

Hold BOOTSEL button on Pico W
Connect USB cable to computer
Release BOOTSEL after connection
RPI-RP2 drive appears
Drag the .uf2 file to RPI-RP2 drive
Pico W automatically reboots

Step 3: Install Thonny IDE¶

Download from: https://thonny.org

Install for your OS (Windows/Mac/Linux)

Step 4: Connect Thonny to Pico W¶

Open Thonny
Run → Select Interpreter
Choose MicroPython (Raspberry Pi Pico)
Select the correct port
Shell should show >>>

Step 5: Generate & Run OceanRemote Code¶

Go to OceanRemote Dashboard
Click "Your Device"
Select Pico W
Configure relays and sensors
Click Generate Code (MicroPython version)
Copy entire code
Paste into Thonny editor
Click Run (green button) or press F5

🔌 Option 2: Arduino IDE (Advanced)¶

Step 1: Install Arduino IDE¶

Download from: https://www.arduino.cc/en/software

Step 2: Add Pico Board Support¶

File → Preferences → Add this URL:

https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

Step 3: Install Board Package¶

Tools → Board → Boards Manager → Search "Raspberry Pi Pico" → Install

Step 4: Select Board¶

Tools → Board → Raspberry Pi RP2040 Boards → Raspberry Pi Pico W

Step 5: Select Flash Size¶

Tools → Flash Size → 2MB (no FS)

Step 6: Generate & Upload¶

Same as ESP32 process → Click Upload (→)

🔌 Wiring Guide¶

DHT22 Temperature & Humidity¶

DHT22 Pin	Pico W Pin	Wire Color (typical)
VCC (pin 1)	3.3V (pin 36)	Red
DATA (pin 2)	GP15 (pin 20)	Yellow
GND (pin 4)	GND (pin 38)	Black

Add 4.7k-10kΩ pull-up resistor between DATA and 3.3V

Soil Moisture Sensor (Capacitive)¶

Sensor Pin	Pico W Pin
VCC	3.3V or 5V (pin 40)
OUT	GP26 (ADC0, pin 31)
GND	GND (pin 38)

Rain Sensor¶

Sensor Pin	Pico W Pin
VCC	5V (pin 40)
AO (Analog)	GP26 (ADC0, pin 31)
DO (Digital)	GP14 (pin 19) - optional
GND	GND (pin 38)

Relay Module¶

Relay Pin	Pico W Pin
VCC	5V (pin 40)
IN1	GP16 (pin 21)
IN2	GP17 (pin 22)
IN3	GP18 (pin 24)
IN4	GP19 (pin 25)
IN5	GP20 (pin 26)
GND	GND (pin 38)

Use external 5V power supply for multiple relays

📊 Pico W Pinout Reference¶

                    ┌─────────────┐
               GP0 ─┤  1      40  ├── VBUS (5V)
               GP1 ─┤  2      39  ├── VSYS (2-5V)
               GND ─┤  3      38  ├── GND
               GP2 ─┤  4      37  ├── 3V3_EN
               GP3 ─┤  5      36  ├── 3.3V
               GP4 ─┤  6      35  ├── ADC_VREF
               GP5 ─┤  7      34  ├── GP28 (ADC2)
               GND ─┤  8      33  ├── GND
               GP6 ─┤  9      32  ├── GP27 (ADC1)
               GP7 ─┤ 10      31  ├── GP26 (ADC0)
               GP8 ─┤ 11      30  ├── RUN
               GP9 ─┤ 12      29  ├── GP22
               GND ─┤ 13      28  ├── GND
              GP10 ─┤ 14      27  ├── GP21
              GP11 ─┤ 15      26  ├── GP20
              GP12 ─┤ 16      25  ├── GP19
              GP13 ─┤ 17      24  ├── GP18
              GND ─┤ 18      23  ├── GND
              GP14 ─┤ 19      22  ├── GP17
              GP15 ─┤ 20      21  ├── GP16
                    └─────────────┘

ADC Pins: GP26, GP27, GP28 (0-3.3V input)

PWM Pins: All GP pins except GP26-28

I2C Default: GP4 (SDA), GP5 (SCL)

SPI Default: GP2 (TX), GP3 (RX), GP6 (SCK)

⚠️ Common Issues & Solutions¶

Problem	Solution
Pico not detected	Hold BOOTSEL while connecting USB
Thonny can't connect	Check Tools → Options → Interpreter → Port
WiFi won't connect	Pico W only supports 2.4GHz networks
ADC reads inaccurate	Use GP26, GP27, or GP28 only (not GP26-28 have better accuracy)
Upload fails (Arduino)	Hold BOOTSEL, release when upload starts
Device stays offline	Check serial monitor for WiFi errors
Relay not clicking	Add external 5V power supply
Code won't save	Thonny: File → Save As → Raspberry Pi Pico

💡 Power Options¶

Power Source	Max Current	Best For
USB port	500mA	Testing, 1-2 relays
Phone charger	1-2A	Multiple relays
Battery (3.7V Li-ion)	2000mAh+	Portable projects
External 5V supply	5-10A	Many relays/pumps

Pico W draw: ~80mA WiFi active, ~2mA sleep

Relay draw: ~70mA per active relay

🔧 Testing Your Pico W¶

Check WiFi Connection¶

Serial Monitor (Thonny Shell) should show:

Connecting to WiFi...
WiFi connected!
IP: 192.168.1.xxx

Check MQTT Connection¶

Connecting to MQTT...
MQTT connected!
Device registered

Test Relay Control¶

Click relay button in OceanRemote dashboard → You should hear click

Test Sensors¶

DHT22: Temp=23.5°C, Humidity=62%
Soil: 45%
Rain: 0%

📊 Pico W vs ESP32 vs ESP8266¶

Feature	Pico W	ESP32	ESP8266
Price	$6	$5-10	$3-5
CPU	RP2040 (133MHz)	Dual-core 240MHz	80MHz
RAM	264KB	520KB	80KB
Flash	2MB	4-16MB	4MB
GPIO pins	26	25	11
ADC pins	3 (12-bit)	18 (12-bit)	1 (10-bit)
WiFi	2.4GHz	2.4GHz	2.4GHz
Bluetooth	No	Yes	No
USB	Native USB	Yes	No
Programming	MicroPython/Arduino	Arduino	Arduino

Best for: - Pico W: Python users, education, low power - ESP32: Complex projects, Bluetooth, multiple sensors - ESP8266: Simple projects, budget builds