ESP32: can't hold an LED powered

Using Arduino LEDs and Multiplexing
1

I've just started with ESP32 and I already have a base knowledge from Arduino, so I jumped to Bluetooth and tried a simple ON/OFF button. My problem is that I can't hold the LED turned ON, it shutdown itself for no reason. I might be doing something wrong with uploading things or misundertanding how ESP32 works. I'll leave the code here, really simple

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

#define LED 16

BluetoothSerial SerialBT;

void setup() {
  pinMode (LED, OUTPUT);
  Serial.begin(115200);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");
}

void loop() {
  while (SerialBT.available())
  {
    int value = SerialBT.parseInt();
    Serial.println (value);    //Debug, ignore
    digitalWrite (LED, value);
  }
  delay(20);
}

EDIT:
By directly debugging from SerialBT.read(), turns out that it sends "-1-1-1-1-1-1-1-1", which "parseInt" reads as 0 every second, so now my question is: How do I ignore it?

2

Does Serial.println(value); also shows the Led has to go dim?

3

No, just show what I send. Look at the edit I made, it has some progress

4

You can make it an unsigned int.. this has no negative values uint8_t (which is an unsigned byte)

5

The problem is that an int already reads 0. If I use a char, to read I or O, it reads the data I send and 5 '\n' I thing

6

HOWEVER, if I only use:

void loop() {
  while (SerialBT.available())
  {
    Serial.println (SerialBT.read());
  }
  delay(20);
}

for the loop, it shows the ASCII of my data, followed by 13 ('\r') and 10 ('\n').

I must be doing something wrong and it might be really stupid.

7

What value of current limiting resistor is in series with the LED?

8

220Ω, not the appropriate for 3.3v, but is the only one I have. Either way, the problem was that I was reading \r and \n and saving it as a value for the LED. Also, not having data on queue returns -1.
The solution is just ignore \r and \n.

9

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