Need Help! The board emits heat, the LED turns on, and the IDE does not recognize it

Official Hardware Nano Family Nano ESP32
1

IMG_8366
IMG_83661920×2560 121 KB

I am a beginner.
I am using Arduino Nano ESP32, but the board starts to generate heat and the board is not recognized by the IDE. If you look at the picture, there is a blue LED next to the reset button and green and orange LEDs on both sides of the USB port.
What is this condition and can I return it to normal?

Below is a sketch uploaded to nano.

#include <SPI.h>
#include "RF24.h"
#include <printf.h> //RCA

#define CE_PIN 9
#define CSN_PIN 10
RF24 radio(CE_PIN, CSN_PIN);

#define Trigger 3

uint8_t address[6] = "00001";
int triggerState = 0;
int comState = 2;
int count = 0;


void setup() {
  Serial.begin(115200);
  // printf_begin();   //RCA
  // delay(1000);
  if (!radio.begin()) {
    Serial.println("NRF24L01 initialization failed!");
    while (1);
  }
  Serial.println("NRF24L01 is working!");
  radio.printDetails();

  radio.setPALevel(RF24_PA_MAX);  // RF24_PA_MAX is default.

  radio.openWritingPipe(address);  // always uses pipe 0
  radio.stopListening();  // put radio in TX mode

  pinMode(Trigger, INPUT);
}

void loop() {
  if (count++ > 9999999)
  {
    radio.write(&comState,sizeof(comState));
    count = 0;
    Serial.print("C-");
  }

  if(digitalRead(Trigger)==HIGH && triggerState == 0)
  {
    triggerState = 1;
    digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
    radio.write(&triggerState,sizeof(triggerState));
    Serial.println(" ");
    Serial.println("Press");
  }
  else if (digitalRead(Trigger)==LOW && triggerState == 1)
  {
    triggerState = 0;
    digitalWrite(LED_BUILTIN, LOW);
    radio.write(&triggerState,sizeof(triggerState));
    Serial.println(" ");
    Serial.println("Release");
  }
}
2

Try performing the bootloader reset in this procedure. Although it is not normal for a Nano ESP32 to feel warm, so I fear something went to greener pastures :cry:

3

Thank you for your reply.
However, even though it has progressed to step 2, it does not reach state 3. It does not change to purple.
Can I just press the RST button once?

4

I don't know anything about the Nano ESP32 and leave further guidance to lburelli.

I just want to mention that the IDE relies on information from the operating system to show serial ports. So you have to check at the operating system level if the board is still recognised; Windows device manager, Linux lsusb and no idea about the Mac.

5

I'm using Windows 10 64-bit version and it doesn't show up in Device Manager. For reference, when another Arduino UNO is connected, the port is displayed.

6

The exact fail-proof sequence should be:

  • short B1 and GND
  • connect the board to the computer
  • press the RST button
  • release the RST button
  • remove the short between B1 and GND

This is a very low level reset and puts the CPU in a known state. If that is still operating properly, the Device Manager must recognize the board as an "Espressif something". There's not much else to do unfortunately :frowning: