Getting Compiled But Not Getting Uploaded...!?

Projects General Guidance
1

I am trying to comunicate between Arduino And esp32.
this is my aurdino code:

void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.println("Hello Boss");
  delay(1500);
}

This is my esp32 code

#define RXp2 16
#define TXp2 17
void setup() {
  Serial.begin(115200);
  Serial2.begin(9600, SERIAL_8N1, RXp2, TXp2);
}
void loop() {
    Serial.println("Message Received: ");
    Serial.println(Serial2.readString());
}

my esp32 code gets compiled and even gets uploaded,but my aurdino code gets compiled but while uploading it shows error:

Arduino: 1.8.19 (Windows Store 1.8.57.0) (Windows 10), Board: "Arduino Uno"

Sketch uses 1632 bytes (5%) of program storage space. Maximum is 32256 bytes.

Global variables use 198 bytes (9%) of dynamic memory, leaving 1850 bytes for local variables. Maximum is 2048 bytes.

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00

avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

An error occurred while uploading the sketch

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Just for confirming i am using correct ports for both codes....

2

Welcome to the forum

Which Arduino board are you using ?

Note that most Arduino boards have 5V inputs and outputs and most ESP32 boards have 3.3V inputs and outputs. Have you got voltage shifters between the boards and a common GND connection ?

This is NOT the cause of the uploading problem but must be taken into account

3

Its Arduino UNO. I dont think its voltage isuue because i have been working with same bord since last year.

4

As I said

Please turn on verbose output for uploading and post the output here

5

Hi @kaifu99. Is the ESP32 board connected to pins 0 and 1 of the UNO board?

6

Yes it is

7

OK, then that is the cause of the upload failure. The pins on the UNO's primary ATmega328P microcontroller that are connected to pins 0 and 1 on the board are also used for communication with the computer over the USB cable. This means that if you connect anything to pins 0 and 1 on the board, it can interfere with uploads and cause them to fail.

For this reason, it is generally recommended to avoid connecting anything to pins 0 and 1. We would typically use the SoftwareSerial library in the sketch program running on the UNO to create a serial interface on pins other than 0 and 1, and connect those pins to the ESP32.

You can learn about the SoftwareSerial library from the documentation here:

https://docs.arduino.cc/learn/built-in-libraries/software-serial/

8

Thank you Guys my problem is solved ...
what i did was , while uploading the auduino code i removed all its pins ...and thats it i got uploaded and after successful upload i then connected the pins and now the project works fine...!

9

You are welcome. I'm glad it is working now.

Regards, Per

10

Is the Uno Tx pin still driving the 3.3V Rx pin on the ESP32 with 5V ?