ESP32 で Wi-Fi につなぐブラウザで値を見る、Raspberry Pi 5 に送る

#include <WiFi.h>

const char* SSID = "your-wifi-name";
const char* PASSWORD = "your-wifi-password";

void setup() {
  Serial.begin(115200);
  WiFi.begin(SSID, PASSWORD);
  Serial.print("connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());       // 例: 192.168.1.42
}

void loop() {}

#include <WiFi.h>
#include <WebServer.h>

WebServer server(80);

void handleRoot() {
  int light = analogRead(2);                       // CdS（→ ADC でセンサーを読む）
  String html = "<h1>Light: " + String(light) + "</h1>";
  server.send(200, "text/html; charset=utf-8", html);
}

void setup() {
  Serial.begin(115200);
  WiFi.begin("your-wifi-name", "your-wifi-password");
  while (WiFi.status() != WL_CONNECTED) delay(500);
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.begin();
}

void loop() {
  server.handleClient();     // リクエストを処理。loop で必ず呼ぶ
}

# python3 -m venv venv && source venv/bin/activate && pip install flask
from flask import Flask, request

app = Flask(__name__)

@app.post("/data")
def data():
    body = request.get_json()
    print("received:", body)
    return "ok"

app.run(host="0.0.0.0", port=8000)

#include <WiFi.h>
#include <HTTPClient.h>

const char* PI5_URL = "http://192.168.1.10:8000/data";   // Pi 5 の IP

void setup() {
  Serial.begin(115200);
  WiFi.begin("your-wifi-name", "your-wifi-password");
  while (WiFi.status() != WL_CONNECTED) delay(500);
}

void loop() {
  int light = analogRead(2);

  HTTPClient http;
  http.begin(PI5_URL);
  http.addHeader("Content-Type", "application/json");
  int code = http.POST("{\"light\":" + String(light) + "}");
  Serial.printf("POST -> %d\n", code);
  http.end();

  delay(10000);    // 10 秒ごと
}