ESP32 Forum

Posted: **Fri Apr 05, 2019 11:11 am**

I've recently acquired the following ESP32: https://i.postimg.cc/K8WqjF9S/20190405-135731.jpg

It is a ESP32 Wrover-B DevKitV4, right ? I can't find any documentation about it.

The only documentation that I could find about a Wrover module is this: https://www.espressif.com/sites/default ... eet_en.pdf

But, as you can see, the pin layout is different. Also the die covers up almost the whole surface of the ESP.

Also, if GPIO 16 and 17 are used for the PSRAM that means that I can't use them ? I'm trying to connect an ESP to a LED Display and I will need the following pins to use for the HUB75:

Code: Select all

+---------+   Panel - ESP32 pins
|  R1 G1  |    R1   - IO25      G1   - IO26
|  B1 GND |    B1   - IO27      GND  - GND
|  R2 G2  |    R2   - IO21      G2   - IO22
|  B2 GND |    B2   - IO23      GND  - GND
|   A B   |    A    - IO12      B    - IO16
|   C D   |    C    - IO17      D    - IO18
| CLK LAT |    CLK  - IO15      LAT  - IO32
|  OE GND |    OE   - IO33      GND  - GND
+---------+

Posted: **Fri Apr 05, 2019 1:07 pm**

https://docs.espressif.com/projects/esp ... devkitc-v4

Also, if GPIO 16 and 17 are used for the PSRAM that means that I can't use them ?

Correct, I don't think they are even connected to the exterior module pads

Posted: **Fri Apr 05, 2019 1:12 pm**

WiFive wrote: ↑
Fri Apr 05, 2019 1:07 pm
https://docs.espressif.com/projects/esp ... devkitc-v4

Also, if GPIO 16 and 17 are used for the PSRAM that means that I can't use them ?
Correct, I don't think they are even connected to the exterior module pads

Thank you for your answer. The page I get from following the link is the right one and that is indeed the ESP I'm using, but upon downloading the PDF I found that the PDF don't match the ESP model from the page. Their pin layout are different.
Neither of the related documents presented on page contains this model of ESP.

I need 14 GPIO for the LED setup.

Can I use 14,15 instead of 16,17 and 4 or 5 instead of 12 ?

Posted: **Fri Apr 05, 2019 1:36 pm**

You can't use 6-11,16-17. 34-39 are input. 0,2,12 require some consideration. 1&3 are uart. That leaves 15 others.

Posted: **Fri Apr 05, 2019 3:21 pm**

WiFive wrote: ↑
Fri Apr 05, 2019 1:36 pm
You can't use 6-11,16-17. 34-39 are input. 0,2,12 require some consideration. 1&3 are uart. That leaves 15 others.

That is perfect !

I've ended up using the following GPIOs : 4, 13, 14, 15, 18, 19, 21, 22, 23, 25, 26, 27, 32, 33.

From what you've told me there shouldn't be any problem.

ESP32 Forum

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