アクセスポイント(AP)を設置してみた

つぶやき

AccessPoint（APモード）

# Note: To connect to the access point, use the SSID and password defined below.
# You can connect to this access point from a smartphone, tablet, or computer.
# After connecting, you can access the device using the IP address shown in the output.

import network
import gc
import time

# Define the SSID (Wi-Fi name) and password for the access point
SSID: str = "Raspberrypi_PICO_W"
PASSWORD: str = "qwertyuiop1234"

gc.collect()  # Run garbage collection to free up memory

# Create the access point interface
ap = network.WLAN(network.AP_IF)

# Configure the access point with the defined SSID and password
ap.config(essid=SSID, password=PASSWORD)

# Set a static IP address: (IP address, subnet mask, gateway, DNS)
ap.ifconfig(("192.168.4.1", "255.255.255.0", "192.168.4.1", "8.8.8.8"))

# Activate the access point so it becomes visible to other devices
ap.active(True)

# Display the network configuration
print("Access Point is ready. Connect from your device:")
print("IP Address: {}\nNet Mask: {}\nGateway: {}\nDNS: {}".format(*ap.ifconfig()))

# Keep the script running to maintain the access point
while True:
    time.sleep(1)  # Sleep to prevent high CPU usage

変数SSIDとPASSWORDは任意の文字列を指定します。
The variables SSID and PASSWORD can be any string.

APモードでボードの温度を表示。

# This script sets up a Raspberry Pi Pico W as a Wi-Fi Access Point (AP)
# It also starts a basic web server that displays the internal temperature
# of the Pico W in a browser. Useful for learning how to use Wi-Fi, HTTP, and sensors.

import network     # For handling Wi-Fi networking
import socket      # For creating the HTTP server socket
import gc          # Garbage collector to free up memory
import time        # To add delays
from machine import ADC  # To read the built-in temperature sensor

# ====== Wi-Fi Access Point Configuration ======

# Define the SSID (Wi-Fi name) and password
SSID: str = "Raspberrypi_PICO_W"
PASSWORD: str = "qwertyuiop1234"

# Run garbage collection to clean up memory before starting
gc.collect()

# Create a WLAN interface in AP (Access Point) mode
ap = network.WLAN(network.AP_IF)

# Configure the AP with the SSID and password
ap.config(essid=SSID, password=PASSWORD)

# Set static IP configuration for the AP
# Format: (IP Address, Subnet Mask, Gateway, DNS)
ap.ifconfig(("192.168.4.1", "255.255.255.0", "192.168.4.1", "8.8.8.8"))

# Activate the access point so other devices can see and connect to it
ap.active(True)

# Print AP info to the serial console
print("Access Point is ready. Connect from your device:")
print("IP Address: {}\nNet Mask: {}\nGateway: {}\nDNS: {}".format(*ap.ifconfig()))

# ====== Internal Temperature Sensor Setup ======

# The internal temperature sensor is connected to ADC channel 4
sensor_temp = ADC(4)

# Convert raw ADC value (0–65535) to voltage (0–3.3V)
conversion_factor = 3.3 / 65535

# Define a function to read and convert the temperature
def read_temperature():
    reading = sensor_temp.read_u16() * conversion_factor  # Convert ADC to voltage
    # Formula to convert voltage to temperature in Celsius
    # Based on RP2040 datasheet: 27 - (V - 0.706) / 0.001721
    temperature_c = 27 - (reading - 0.706) / 0.001721
    return round(temperature_c, 2)

# ====== HTTP Server Setup ======

# Get IP address and port for the server
addr = socket.getaddrinfo("0.0.0.0", 80)[0][-1]

# Create a socket for incoming connections
server_socket = socket.socket()
server_socket.bind(addr)     # Bind socket to the address
server_socket.listen(1)      # Listen for 1 connection at a time

print("HTTP server is running. Access http://192.168.4.1 from your browser.")

# ====== Main Loop: Serve Web Page with Temperature ======
while True:
    try:
        # Wait for a client to connect
        client, addr = server_socket.accept()
        print("Client connected from", addr)

        # Read the HTTP request from the client
        request = client.recv(1024)

        # Get the current temperature
        temperature = read_temperature()

        # Create a simple HTML page with the temperature
        html = f"""\
HTTP/1.1 200 OK

<!DOCTYPE html>
<html>
<head>
    <title>Pico Temperature</title>
    <meta http-equiv="refresh" content="5">
    <style>
        body {{
            font-family: Arial, sans-serif;
            text-align: center;
            padding-top: 50px;
        }}
        .temp {{
            font-size: 2em;
            color: #333;
        }}
    </style>
</head>
<body>
    <h1>Raspberry Pi Pico W</h1>
    <p class="temp">Internal Temperature: <strong>{temperature:.1f} degree C</strong></p>
    <p>(Page refreshes every 5 seconds)</p>
</body>
</html>
"""

        # Send the HTTP response to the client
        client.send(html)

        # Close the connection
        client.close()

    except Exception as e:
        # If something goes wrong, print the error and close the connection
        print("Error:", e)
        client.close()

温度をグラフ表示してみた

import network
import socket
import gc
import time
from machine import ADC

SSID = "Raspberrypi_PICO_W"
PASSWORD = "qwertyuiop1234"

gc.collect()

ap = network.WLAN(network.AP_IF)
ap.config(essid=SSID, password=PASSWORD)
ap.ifconfig(("192.168.4.1", "255.255.255.0", "192.168.4.1", "8.8.8.8"))
ap.active(True)

print("Access Point is ready. Connect from your device:")
print("IP Address: {}\nNet Mask: {}\nGateway: {}\nDNS: {}".format(*ap.ifconfig()))

sensor_temp = ADC(4)
conversion_factor = 3.3 / 65535

def read_temperature():
    reading = sensor_temp.read_u16() * conversion_factor
    temperature_c = 27 - (reading - 0.706) / 0.001721
    return round(temperature_c, 1)

# Temperature history list (max 20 entries)
history = []

# Simple Web Server
addr = socket.getaddrinfo("0.0.0.0", 80)[0][-1]
server_socket = socket.socket()
server_socket.bind(addr)
server_socket.listen(1)

print("HTTP server running at http://192.168.4.1")

while True:
    temperature = read_temperature()
    history.append(temperature)
    if len(history) > 20:
        history.pop(0)  # Keep only the last 20 readings

    try:
        client, addr = server_socket.accept()
        print("Client connected from", addr)
        request = client.recv(1024)

        # Convert temperature list to JavaScript array format
        js_data = ','.join(str(t) for t in history)

        html = f"""\
HTTP/1.1 200 OK

<!DOCTYPE html>
<html>
<head>
    <title>Pico Temperature History</title>
    <meta http-equiv="refresh" content="5">
    <style>
        body {{
            font-family: sans-serif;
            text-align: center;
            margin-top: 40px;
        }}
        canvas {{
            border: 1px solid #ccc;
        }}
    </style>
</head>
<body>
    <h1>Temperature History</h1>
    <p>Current Temperature: <strong>{temperature:.1f} degree C</strong></p>
    <canvas id="chart" width="300" height="150"></canvas>
    <script>
        const data = [{js_data}];
        const canvas = document.getElementById('chart');
        const ctx = canvas.getContext('2d');
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.beginPath();
        ctx.strokeStyle = 'blue';

        let max = Math.max(...data);
        let min = Math.min(...data);
        let range = max - min || 1;
        let scaleX = canvas.width / (data.length - 1);
        let scaleY = canvas.height / range;

        for (let i = 0; i < data.length; i++) {{
            let x = i * scaleX;
            let y = canvas.height - (data[i] - min) * scaleY;
            if (i === 0) {{
                ctx.moveTo(x, y);
            }} else {{
                ctx.lineTo(x, y);
            }}
        }}
        ctx.stroke();
    </script>
    <p>(Graph updates every 5 seconds)</p>
</body>
</html>
"""
        client.send(html)
        client.close()

    except Exception as e:
        print("Error:", e)
        client.close()

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