In this scheme how do I include the wifi?
My actual code:
int led_pin=13;
int Buzzer=4;
int analog_pin=A0;
void setup() {
Serial.begin(9600);
pinMode(led_pin, OUTPUT);
pinMode(Buzzer, OUTPUT);
}
void loop() {
int temp;
temp=analogRead(analog_pin);
if(temp>300)
{
Serial.print("[alarmegas]");
Serial.println("[alarmegas]");
delay(30000);
}
}
First get a decent power supply. The 9 volt battery (and onboard regulator) don't have the ability to supply the power requirements of the ESP.
The ESP-01 uses a serial interface so you either connect it to the serial pins (D0,D1) and disconnect the USB cable or use software serial on two different pins.
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Just pointing out an alternative.
Using an ESP8266 board like the NodeMCU or ESP32 and a DS18B20 temperature sensor would be easier than your current setup with adding on a ESP8266-01. No Nano required and you have WiFi.
It is not just programming 2 processors to talk to each other. If the Nano is a 5V unit you have to contend with levels shifting the Nano 5V TX to the ESP 3.3V RX and providing adequate 3.3V to the ESP (Nano 3.3V will not cut it).
I like your idea, thank you very much.
And how would I make the connections in this scenario? Can you help me? 
Start by ditching the PP3 battery if that really is what you are using then substitute a NodeMCU or ESP32 for the ESP-01as previously suggested
Using an ESP-01 and an Arduino makes no sense.
I gather the blue board you cite is a gas sensor. This requires 5 V and draws significant current so you need a 5 V supply to power it. The Nano is not a 5 V power supply so you have a problem there.
The ESP-01 does not have the analog input connected, otherwise it would do the job. Looks like a WeMOS D1 Mini is the answer, when you find a suitable 5 V power supply.
NodeMCU is an unnecessarily more expensive version of the WeMOS D1 Mini; no advantage.
If only a temperature measurement was wanted, a DS18B20 could be directly used with an ESP-01 and powered by two "AA" cells, but this appears to be using a gas sensor.
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