I have been able to compile and upload the "Blink / Hello World" test using pin 2 as and output to drive the LED. When I selected pin 15, the serial monitor produced pages of "stuff" without the "Hello world" being displayed. According to the picture I have for this IC and board, pin 15 should be …

Please, post the picture of your Board.

looking at esp32-pinout-reference-gpios it states GPIO15 outputs PWM signal at boot, strapping pin GPIO 15 (must be HIGH during boot) could you be pulling it LOW at boot?

As requested: Thanks for the reply. //LED on GPIO2 int ledPin = 15; void setup() { // put your setup code here, to run once: //Set LED as Output pinMode(ledPin, OUTPUT); //Serial Monitor Setup Serial.begin(115200); } void loop() { Serial.print("Hello"); digitalWrite(ledPin, HIGH); de…

if load your code of post 5 into a ESP32-Wroom-32 it blinks LED on GPIO15 and prints Hello world! Hello world! Hello world! Hello world! how have you wired the led? does it have a built in resistor?

[image] wings515: I do not see a link to upload a picture. Search net giving the name of your Board like ESP32 Board. Then select a picture that matches with your Board, copy the picture, and paste it here in a post window. The Fig-1 is a pictorial view of a 30-pin ESP32; there are 36-pin ver…

the ESP32-WROOM-32 I have is a 38pin device [image]

My all three are of 30-pin version. [ESP32DevMod30Pin]

There are a LOT of restrictions on how and when you can use the ESP32 GPIOs. Many of them have fixed functions that CANNOT be disabled. Quite a few are used to connect the FLASH memory to the ESP module. Some can ONLY be inputs, others can ONLY be outputs. Several others MUST be held in a specif…

Based on Data Sheets, I have prepared the following diagram (Fig-1) that shows which pins of the ESP32 are available to the user via the 30-pin of the ESP32 Dev Module. [esp32pinMapping-2] Figure-1:

ESP 32 Wroom-32 pin allocation

Projects Programming

horace February 26, 2024, 4:06pm 8

the ESP32-WROOM-32 I have is a 38pin device

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ESP 32 Wroom-32 pin allocation

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