Read ESP8266 serial console with Arduino UNO

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  • Hello, I am trying to read ESP-01 (ESP8266) Espruino log with Arduino UNO by serial and not works correctly.

    My Arduino UNO code:

    [#include](­arch/?q=%23include) <SoftwareSerial.h>
    SoftwareSerial mySerial(0, 1); // RX, TX
    void setup() {
      //Init serial ports
      Serial.println("Hello from arduino");
    void loop(){
     String IncomingString = "";
     boolean StringReady = false;
     while (mySerial.available()){
       IncomingString = mySerial.readString();
       StringReady =  true;
      if (StringReady){
        Serial.println("Received String: " + IncomingString);

    Espruino code:

    var wifi = require("Wifi");
    var http = require("http");
    wifi.connect('YYYY', {password:'XXXX'}, function(e) {
      if (e) {
        console.log('error during connect:',e);
      } else {
        console.log('connected to wifi');
        http.get("https://jsonplaceholder.typico­", function(res) {
          res.on('data', function(data) {

    Actual arduino uno log: Screenshot in attachments

    Excepted log:

    connected to wifi
      "userId": 1,
      "id": 1,
      "title": "sunt aut facere repellat provident occaecati excepturi o
    ptio reprehenderit",
      "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"

    1 Attachment

    • Screenshot 2022-05-28 at 15.52.12.png
  • Your Adruino code looks complicated, and I'm not sure if it's correct, or if you're overwriting the variable IncomingString in the while loop.

    The sample code for serial input from­l-available:

    void loop( ) // loop function that executes repeatedly  
    if(Serial.available( ) > 0) //  It will only send data when the received data is greater than 0.  
    arrivingdatabyte = );  // It will read the incoming or arriving data byte  
    Serial.print("data byte received:");  
    Serial.println(arrivingdatabyte, DEC); // here, DEC means Decimal  

    I'd suggest to remove the while and the true/false in your code, and change it according to the sample code.

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Read ESP8266 serial console with Arduino UNO

Posted by Avatar for user144453 @user144453