ESP32-CAM Fire Gas Alert System (copy)

#include <Arduino.h>
#include <Wire.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <HTTPClient.h>
#include <WebServer.h>
#include "esp_camera.h"
// Fill these four values before Deploy. Never share your bot token.
const char* WIFI_NAME = "Inst";
const char* WIFI_PASSWORD = "deco9292";
const char* BOT_TOKEN = "YOUR_BOT_TOKEN";
const char* CHAT_ID = "YOUR_CHAT_ID";
// Most comparator modules trigger LOW. Change if your bench test shows otherwise.
const bool GAS_ACTIVE_LOW = true, FLAME_ACTIVE_LOW = true;
const uint32_t GAS_WARMUP_MS = 180000;
WebServer server(80);
volatile bool gasAlarm=false, fireAlarm=false, ioFault=false;
volatile uint8_t pending=0;
bool cameraOK=false;
void regWrite(uint8_t reg,uint8_t value){Wire.beginTransmission(0x20);Wire.write(reg);Wire.write(value);if(Wire.endTransmission()!=0)ioFault=true;}
int inputs(){Wire.beginTransmission(0x20);Wire.write(0x12);if(Wire.endTransmission(false)!=0)return -1;if(Wire.requestFrom(0x20,1)!=1)return -1;return Wire.read();}
void alarmTask(void*){
 uint8_t last=255; int gCount=0,fCount=0;
 for(;;){
 int in=inputs();ioFault=in<0;
 bool g=in>=0 && (((in&1)==0)==GAS_ACTIVE_LOW) && millis()>GAS_WARMUP_MS;
 bool f=in>=0 && (((in&2)==0)==FLAME_ACTIVE_LOW);
 gCount=g?min(gCount+1,5):max(gCount-1,0);fCount=f?min(fCount+1,5):max(fCount-1,0);
 bool ng=gCount==5?true:(gCount==0?false:gasAlarm);
 bool nf=fCount==5?true:(fCount==0?false:fireAlarm);
 if(ng&&!gasAlarm)pending|=1;if(nf&&!fireAlarm)pending|=2;
 gasAlarm=ng;fireAlarm=nf;
 bool ready=millis()>GAS_WARMUP_MS;
 uint8_t out=(!ng&&!nf&&ready&&!ioFault?4:0)|(nf?8:0)|(ng?16:0);
 if(out!=last){regWrite(0x14,out);last=out;}
 ledcWriteTone(3,(ng||nf||ioFault)?4000:0);
 vTaskDelay(pdMS_TO_TICKS(100));
 }
}
void telegramTask(void*){
 for(;;){
 if(pending && WiFi.status()==WL_CONNECTED && String(BOT_TOKEN)!="YOUR_BOT_TOKEN"){
 uint8_t item=(pending&1)?1:2;
 WiFiClientSecure tls;
 // Encryption enabled, but certificate validation disabled: see project warning.
 tls.setInsecure(); HTTPClient http;http.setTimeout(5000);
 String url="https://api.telegram.org/bot"+String(BOT_TOKEN)+"/sendMessage";
 if(http.begin(tls,url)){http.addHeader("Content-Type","application/x-www-form-urlencoded");
 String text=item==1?"Gas%20leak%20detected!":"Fire%20detected!";
 int code=http.POST("chat_id="+String(CHAT_ID)+"&text="+text);
 if(code==200)pending&=~item;
 http.end();}
 }
 vTaskDelay(pdMS_TO_TICKS(10000));
 }
}
void setup(){
 // TX-only logging leaves GPIO3 available for the piezo. Disconnect adapter TX after flashing.
 Serial.begin(115200,SERIAL_8N1,-1,1);
 Wire.begin(13,14);Wire.setClock(100000);Wire.setTimeOut(50);
 regWrite(0x00,0xE3);regWrite(0x0C,0x03);regWrite(0x14,0);
 ledcAttachChannel(3,4000,8,2);
 xTaskCreate(alarmTask,"alarms",3072,nullptr,2,nullptr);
 camera_config_t c={};c.ledc_channel=LEDC_CHANNEL_0;c.ledc_timer=LEDC_TIMER_0;
 c.pin_d0=5;c.pin_d1=18;c.pin_d2=19;c.pin_d3=21;c.pin_d4=36;c.pin_d5=39;c.pin_d6=34;c.pin_d7=35;
 c.pin_xclk=0;c.pin_pclk=22;c.pin_vsync=25;c.pin_href=23;c.pin_sscb_sda=26;c.pin_sscb_scl=27;c.pin_pwdn=32;c.pin_reset=-1;
 c.xclk_freq_hz=20000000;c.pixel_format=PIXFORMAT_JPEG;c.frame_size=FRAMESIZE_QVGA;c.jpeg_quality=12;c.fb_count=1;
 cameraOK=esp_camera_init(&c)==ESP_OK;
 WiFi.mode(WIFI_AP_STA);WiFi.softAP("Camera-Alarm","cameraalarm123");
 if(String(WIFI_NAME)!="YOUR_WIFI_NAME")WiFi.begin(WIFI_NAME,WIFI_PASSWORD);
 server.on("/",[]{server.send(200,"text/html",R"HTML(<html><meta name="viewport" content="width=device-width"><h2>Camera Alarm</h2><p id="state"></p><img id="cam" width="320"><script>async function update(){document.getElementById('cam').src='/capture?t='+Date.now();try{document.getElementById('state').textContent=await(await fetch('/status')).text()}catch(e){}}setInterval(update,1000);update();</script></html>)HTML");});
 server.on("/status",[]{String msg=ioFault?"Sensor wiring fault":String("Gas: ")+(gasAlarm?"ALARM":"clear")+" | Fire: "+(fireAlarm?"ALARM":"clear");if(millis()<GAS_WARMUP_MS)msg+=" | Gas sensor warming up";msg+=" | Wi-Fi IP: "+WiFi.localIP().toString();server.send(200,"text/plain",msg);});
 server.on("/capture",[]{if(!cameraOK){server.send(503,"text/plain","Camera failed to initialize");return;}camera_fb_t* fb=esp_camera_fb_get();if(!fb){server.send(503,"text/plain","Capture failed");return;}server.sendHeader("Cache-Control","no-store");server.setContentLength(fb->len);server.send(200,"image/jpeg","");WiFiClient client=server.client();client.write(fb->buf,fb->len);esp_camera_fb_return(fb);});
 server.begin();xTaskCreate(telegramTask,"telegram",8192,nullptr,1,nullptr);
 Serial.println("Connect to Camera-Alarm and open http://192.168.4.1");
}
void loop(){server.handleClient();delay(2);}