From bec5a96bed2e4a9cba5756c09c7a16f1739525c5 Mon Sep 17 00:00:00 2001
From: kkira <kira.n.neit@gmail.com>
Date: Sat, 16 May 2026 20:23:46 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D0=B5=D1=80=D0=B5=D0=B4=D0=B0=D1=87?=
 =?UTF-8?q?=D0=B0=20=D0=B4=D0=B0=D0=BD=D0=BD=D1=8B=D1=85=20=D1=81=20=D0=B4?=
 =?UTF-8?q?=D0=B0=D1=82=D1=87=D0=B8=D0=BA=D0=BE=D0=B2=20=D1=81=20ESP32=20?=
 =?UTF-8?q?=D0=B2=20NODE-RED=20(mqtt-broker:Mosquitto)?=
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---
 esp_node-red_mqtt/sketch_may14b.ino | 126 +++++++++++++++++++++++++---
 1 file changed, 116 insertions(+), 10 deletions(-)

diff --git a/esp_node-red_mqtt/sketch_may14b.ino b/esp_node-red_mqtt/sketch_may14b.ino
index 2cb1df2..0b649f5 100644
--- a/esp_node-red_mqtt/sketch_may14b.ino
+++ b/esp_node-red_mqtt/sketch_may14b.ino
@@ -1,12 +1,22 @@
 #include "esp_camera.h"
 #include <WiFi.h>
 #include "esp_http_server.h"
-#include <ESP32Servo.h>
+
+#include <PubSubClient.h>
 #include <Wire.h>
 #include <BH1750.h>
-#include <Adafruit_GFX.h>
-#include <Adafruit_SSD1306.h>
-#include <Adafruit_NeoPixel.h>
+
+BH1750 lightMeter;
+
+#define AHT20_ADDR 0x38
+
+float temperature = 0;
+float humidity = 0;
+
+WiFiClient espClient;
+PubSubClient client(espClient);
+
+const char* mqtt_server = "192.168.31.78";
 
 // WIFI
 const char* ssid = "Cathouse";
@@ -48,11 +58,9 @@ static esp_err_t stream_handler(httpd_req_t *req)
     camera_fb_t *fb = NULL;
 
     static const char* boundary = "--frame\r\n";
-    static const char* header =
-        "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
+    static const char* header = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
 
-    httpd_resp_set_type(req,
-        "multipart/x-mixed-replace; boundary=frame");
+    httpd_resp_set_type(req, "multipart/x-mixed-replace; boundary=frame");
 
     uint32_t start = millis();
 
@@ -158,8 +166,8 @@ bool initCamera()
     config.xclk_freq_hz = 20000000;
     config.pixel_format = PIXFORMAT_JPEG;
 
-    config.frame_size = FRAMESIZE_QVGA;
-    config.jpeg_quality = 16;
+    config.frame_size = FRAMESIZE_QQVGA;
+    config.jpeg_quality = 20;
     config.grab_mode = CAMERA_GRAB_LATEST;
     config.fb_count = 1;
     config.fb_location = CAMERA_FB_IN_DRAM;
@@ -186,6 +194,45 @@ bool initCamera()
 }
 
 
+bool readAHT20(float &temp, float &hum)
+{
+    uint8_t cmd[3] = {0xAC, 0x33, 0x00};
+
+    Wire.beginTransmission(AHT20_ADDR);
+    Wire.write(cmd, 3);
+
+    if (Wire.endTransmission() != 0)
+        return false;
+
+    delay(80);
+
+    Wire.requestFrom(AHT20_ADDR, 6);
+
+    if (Wire.available() < 6)
+        return false;
+
+    uint8_t data[6];
+
+    for (int i = 0; i < 6; i++)
+        data[i] = Wire.read();
+
+    uint32_t h =
+        ((data[1] << 12) |
+        (data[2] << 4) |
+        (data[3] >> 4));
+
+    uint32_t t =
+        ((data[3] & 0x0F) << 16) |
+        (data[4] << 8) |
+        data[5];
+
+    hum = (h * 100.0) / 1048576.0;
+    temp = (t * 200.0 / 1048576.0) - 50;
+
+    return true;
+}
+
+
 void setup()
 {
     Serial.begin(115200);
@@ -210,6 +257,13 @@ void setup()
     Serial.println("\nWIFI OK");
     Serial.println(WiFi.localIP());
 
+    Wire.begin(1, 2);
+    Wire.setClock(100000);
+
+    lightMeter.begin();
+
+    client.setServer(mqtt_server, 1883);
+
     startServer();
 
     Serial.println("STREAM READY:");
@@ -217,7 +271,59 @@ void setup()
 }
 
 
+void connectMQTT() {
+  while (!client.connected()) {
+    String id = "ESP32CAM-" + String(WiFi.macAddress());
+
+    if (client.connect(id.c_str())) {
+      Serial.println("MQTT OK");
+    } else {
+      Serial.println("MQTT FAIL");
+      delay(2000);
+    }
+  }
+}
+
+
 void loop()
 {
+    if (!client.connected())
+        connectMQTT();
+
+    client.loop();
+
+    static unsigned long lastMQTT = 0;
+
+    if (millis() - lastMQTT > 5000)
+    {
+        lastMQTT = millis();
+
+        float lux = lightMeter.readLightLevel();
+
+        readAHT20(temperature, humidity);
+
+        char buf[32];
+
+        snprintf(buf, sizeof(buf), "%.2f", lux);
+        client.publish("esp32/sensors/light", buf);
+
+        snprintf(buf, sizeof(buf), "%.2f", temperature);
+        client.publish("esp32/sensors/temp", buf);
+
+        snprintf(buf, sizeof(buf), "%.2f", humidity);
+        client.publish("esp32/sensors/humidity", buf);
+
+        Serial.println("MQTT SEND");
+
+        Serial.print("Lux: ");
+        Serial.println(lux);
+
+        Serial.print("Temp: ");
+        Serial.println(temperature);
+
+        Serial.print("Hum: ");
+        Serial.println(humidity);
+    }
+
     vTaskDelay(2);
 }
\ No newline at end of file