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arduinoarduino-esp32
Akash kumar
Akash kumar

Reputation: 1053

ESP32-S3 board is not blinking on pin 48

I reset the ESP32-S3 board and uploaded simple blink code, but nothing happens

#define LED_BUILTIN 48 

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
 digitalWrite(LED_BUILTIN,HIGH);
 delay(1000);
 digitalWrite(LED_BUILTIN,LOW);
 delay(1000);
}

Upvotes: 1

Views: 616

Answers (3)

Khalid Nawaz Khan
Khalid Nawaz Khan

Reputation: 1

use the following example code as it is neopixle from adafruit.

#include <Adafruit_NeoPixel.h> 

#define PIN 48
#define NUMPIXELS 1

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 500

void setup () {  
  
  pixels.begin();

}

void loop () {

  pixels.clear();

  for(int i=0; i<NUMPIXELS; i++) {
    pixels.setPixelColor(i, pixels.Color(0, 150, 0));
    pixels.show();
    delay(DELAYVAL);
  }

}

Upvotes: -1

Juraj
Juraj

Reputation: 3736

ESP32 Arduino platform for some ESP32 boards in pins_arduino.h has a definition of LED_BUILTIN. For example for the "ESP32S3 Dev Module" it is:

#define PIN_NEOPIXEL        48
static const uint8_t LED_BUILTIN = SOC_GPIO_PIN_COUNT+PIN_NEOPIXEL;
#define LED_BUILTIN LED_BUILTIN  // allow testing #ifdef LED_BUILTIN
#define RGB_BUILTIN LED_BUILTIN
#define RGB_BRIGHTNESS 64

The LED_BUILTIN here has a strange value SOC_GPIO_PIN_COUNT+PIN_NEOPIXEL. This is to distinguish normal use of the IO pin from use for the on-board RGB LED. In digitalWrite if the pin is RGB_BUILTIN they invoke neopixelWrite instead of gpio_set_level which is executed for all normal IO pins including 48.

The neopixelWrite function then uses the Neopixel protocol to communicate with the on-board RGB LED.

So don't redefine LED_BUILTIN but use the one already defined in pins_arduino.h.

Upvotes: 2

Akash kumar
Akash kumar

Reputation: 1053

I checked with Serial Monitor and it printed the value exactly, so what I did, I just removed #define LED_BUILTIN 48 and it worked. Here is the final working Code.

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);  
  Serial.println("LED Test");// wait for a second
}

Upvotes: 0

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