ESP32-PICO-D4 Questions

[bigdingo]

Hello all,

I have build a custom PCB that has a PICO-D4 populated as part of the design, I have built a off-board programming PCB so that in production we can save some costs by not including all the unnecessary programming components on every board.

I have based my design on the ESP-PICO-D4-Kit and use the same programming components that development board uses.

I have a couple of questions that I would like some help with please.

I am using the Arduino IDE for programming as I am comfortable with that, and found that I was not able to upload to my board, following some other forum posts I found that I was only able to program my board if I pulled IO2 and IO12 down to GND, why would this be when on the ESP32-PICO-D4-Kit, D12 is pulled up to 3.3v and IO2 is not connected, how does it work on the dev board but not for me?

Also, is there a pin mapping/reference schedule for GPIO pins and what their identifiers are in the Arduino IDE? I have Status LEDs connected to IO19, IO22 and IO23 but when I address these with the following code, nothing happens.

Code: Select all

const int led1 = 19;
const int led2 = 22;
const int led3 = 23;

void setup() {
  // put your setup code here, to run once:

  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);
  pinMode (led3, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:

digitalWrite(led1, HIGH);
digitalWrite(led2, HIGH);
digitalWrite(led3, HIGH);

}

Thank you all for your assistance.

Best,

M

[ESP_LJH]

On the picokit, GPIO12 is not pulled up, that resistor is NC ( NOT populated ).
If you need pull GPIO12 and GPIO2 to ground, then it means that on your board, you pull them up to 3.3. Please check your schematic.

[bigdingo]

Thank you, I see this now,

I have GPIO pulled up to 3.3v but GPIO2 is floating, can they both be floating?

Best,
M