Arduino program won't compile

Projects Programming
1

Hi all, I am fooling around with a program I found on an Arduino site. I would like to make a indoor air quality monitor for my Arduino uno. I copied a program that looked simple enough with little hardware to purchase. When I went to compile the program after installing it I got an error wherever a line had this in it
cipsend += connectionId; I don't know if I am missing a library or what. If you can, please help. Thanks

2

We’ll never know until you post your COMPLETE code within code tags

3

I think you have ESP32 code.
Look for Arduino code.

https://docs.espressif.com/projects/esp-at/en/latest/esp32/AT_Command_Set/TCP-IP_AT_Commands.html

4 
type or paste code [code]

#include <SoftwareSerialTX.h>
#include <SoftwareSerial.h>
#include <LiquidCrystal.h>
#include <MQ135.h>
#define DEBUG true
SoftwareSerial esp8266(9,10);
const int sensorPin= 0;
int air_quality;
LiquidCrystal lcd(12,11, 5, 4, 3, 2);

void setup() {
  pinMode(8, OUTPUT);
  lcd.begin(16,2);
  lcd.setCursor (0,0);
  lcd.print ("circuitdigest ");
  lcd.setCursor (0,1);
  lcd.print ("Sensor Warming ");
  delay(1000);
  Serial.begin(115200);
  esp8266.begin(115200);
  sendData("AT+RST\r\n",2000,DEBUG);
  sendData("AT+CWMODE=2\r\n",1000,DEBUG);
  sendData("AT+CIFSR\r\n",1000,DEBUG);
  sendData("AT+CIPMUAIR_QUALITY=1\r\n",1000,DEBUG);
  sendData("AT+CIPSERVER=1,80\r\n",1000,DEBUG);
  pinMode(sensorPin, INPUT);
  lcd.clear();
}
void loop() {
  MQ135 gasSensor = MQ135(A0);
  float air_quality = gasSensor.getPPM();
  if(esp8266.available()) 
{
  if(esp8266.find("+IPD,"))
{
  delay(1000);
  
  int connectionId = esp8266.read()-48; /*
  String webpage = "<h1>IOT Air Pollution Monitoring System</h1>";
  webpage += "<p><h2>";
  webpage+= " Air Quality is ";
  webpage+= air_quality;
  webpage+=" PPM";
  webpage += "<p>";
  if (air_quality<=1000)
  {
  webpage+= "Fresh Air";
  }
  else if(air_quality<=2000 && air_quality>=1000)
  {
  webpage += "Poor Air";
  }
  else if (air_quality>=2000 )
  {
    webpage+= "Danger! Move to Fresh Air";
  }
  webpage += "</h2></p><body>";
  String cipSend = "AT+CIPSEND=";
  cipSend += connectionId;
  cipSend += ",";
  cipSend +=webpage.length();
  cipSend +="\r\n";

  sendData(cipSend,1000,DEBUG);
  sendData(webpage,1000,DEBUG);

  cipSend = "AT+CIPSEND=";
  cipSend += connectionId;
  cipSend += ",";
  cipSend +=webpage.length();
  cipSend +="\r\n";

  String closeCommand = "AT+CIPCLOSE=";
  closeCommand+=connectionId;
  closeCommand+="\r\n";

  sendData(closeCommand,3000,DEBUG);
}
}
lcd.setCursor (0, 0);
lcd.print ("Air Quality is ");
lcd.print (air_quality);
lcd.print (" PPM ");
lcd.setCursor (0,1);
if (air_quality<=1000)
{
  lcd.print("Fresh Air");
  digitalWrite(8, LOW);
}
else if( air_quality>=1000 && air_quality<=2000 )
{
  lcd.print("Poor Air, Open Windows");
}
else if (air_quality>=2000 )
{
  lcd.print("Danger! Move to Fresh Air");
  digitalWrite(8, HIGH);
}
lcd.scrollDisplayLeft();
delay(1000);
}
String sendData(String command, const int timeout, boolean debug)
{
  String response = "";
  esp8266.print(command);
  long int time = millis();
  while( (time+timeout) > millis())
  {
    while(esp8266.available())
    {
      char c = esp8266.read();
      response+=c;
    }
  }
  if(debug)
  {
    Serial.print(response);
  }
  return response;

 } 
  
  
[/code]
5

Are you making an ESP8266 communicate with an Arduino Uno?
Why is 75% of your code commented-out?
Draw a wiring diagram to show your intent.

6

I don't know if it changed at your end but what I show what I posted nothing is commented out. The only lines I commented out to get it to compile was the lines I stated at first. CipSend += connectionId; I recommended before sending to the forum.

7

Your post #4 clearly shows the comment mark. Why are you not looking at your own code?

8

SoftwareSerial is unlikely to work or be reliable at 115200 bps