How to read the Tx pin data of nodemcu in blynk 2.0

Need Help With My Project
1

I had made a project to recieve data from mq135 sensor which is connected to arduino uno , i connected the uno board with nodemcu for serial communication b/w them . And i got the outputs in the serial monitor , now i dontknow how to read those values from tx pin in blynk app

2

What role does the Arduino Uno play in this setup?

It would be far simpler to throw the Uno away and connect the mq135 directly to your NodeMCU

Pete.

3

I have already connected the soil moisture sensor to the analog pin of NodeMCU,since the NodeMCU has only one analog pin, i can’t connect the mq135 sensor to it, so I’ve used the Arduino Uno board.

ANYONE KINDLY HELP ME ASAP.

Thavanesh_s.

4

You better use ESP32 !
The ESP32 has a total of 18 analog input pins

5

I currently don’t have the ESP32
I’ve purchased the NodeMCU esp 8266. If I had known this already I would buy ESP32.
so I need to proceed with ESP8266 now.

ANYONE KINDLY HELP ME ASAP.

Thavanesh

6

How to read the “Tx pin data of nodemcu”, so you mean “How to read the Rx pin data of nodemcu”

7

yeah bro

8

This is a clue without Blynk, but you have to manage the received data, it’s not easy , give it a try :

//Arduino Uno

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.print("Data to be sent\n");
  delay(1000);
}

//NodeMCU

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
    String data = Serial.readString();
    Serial.print("Data Received: ");
    Serial.println(data);
  }
  delay(1000);
}
9

actually i just received the data from the arduino uno board and I can view it in the serial monitor . Now the thing is that I need to view it in the blynk.

Thavanesh