DOIT ESP32 DEVKIT V1 Board

[dbachko]

How to match pin names? doitESP32devkitV1.
Pics:

[copercini]

You can use it as "ESP32 Dev Module", D13 is GPIO13, D14 is GPIO14 and so on...

Anyway, here is a DOIT author github page: https://github.com/Nicholas3388/LuaNode, have the old board schematic and you can ask for the new one

[liqngliz]

Here you go :) It also took me a while to find the schematics. Just not the following, the GPIO pins follow the numbers 1-27 (lower right pin out schematics), but the analog pins labeled as A6-A9 are 34, 35, 32, 33, 25, 28. The board labels on board are pretty accurate except you need to know that those analog pins are not labeled unless you look at the schematic.

Some other quirks I noticed:
Also when you power the board with a 5v USB you get 5v power out of the VIN pin, I used this to power a 5v servo with no problems, even during extended stall draw was ok. Also don't accidentally cross ground on the VIN side with ground on the 3.3v side, you will blow your board when powered via USB.

SchematicsforESP32.pdf

[lonerzzz]

@dbachko Did the information provided answer your question?

[ICELUCKBR]

You can talk about the UART Serials, I know have three Ports, but I no can't found the tx1 rx1

[copercini]

@PITDEVBR by default the pins of serial1 are rx1Pin = 9; tx1Pin = 10; and serial2 rx2Pin = 16; tx2Pin = 17;

But you can set it on any pin if you want: Serial1.begin(9600, SERIAL_8N1, gpioX_rx, gpioY_tx);

[ICELUCKBR]

@copercini but in module ESP32 the DOIT dont have the pins 9 and 10. With is command "Serial1.begin(9600, SERIAL_8N1, gpioX_rx, gpioY_tx);" I can change for anywhere pin in module?

[me-no-dev]

yes. just make sure that TX is below GPIO34. RX can be above

[ICELUCKBR]

Someone have the code using the firmware the changing the serials 1 for test, a create but no have successful...

[copercini]

@PITDEVBR like this:

HardwareSerial Serial1(1);  // UART1/Serial1 

void setup() {
  Serial.begin(115200);
  Serial1.begin(9600,SERIAL_8N1,9,10); //You can change 9 and 10 to another pins
}

Have fun =)

[sarwadenj]

Hi @liqngliz

The schematic pdf which you shared is verified , i want to use it in one of design.
Thanks.

[chinswain]

"Also don't accidentally cross ground on the VIN side with ground on the 3.3v side, you will blow your board when powered via USB." Could someone explain this to me? Are you saying not to use the GND pin next to Vin with the 3v side? I've been doing just that on a lolin32 ;(

[DavidAntliff]

@chinswain I'm looking at the schematic and I'm also not sure what @liqngliz is referring to. The schematic doesn't really make a distinction between the grounds so it's not clear to me where the separation is meant to be, or why shorting the grounds would cause an issue. The only thing I can see is that there's just a diode with no current-limiting resistor between the VCCUSB and the VIN pin, which means if you were to short VIN to ground then you'd blow the diode, probably.

I suppose if you tried to impose non-common 5V on both sides of the diode, then the ground on the VIN side would sit one diode bias voltage below the ground on the other, but I'm not sure why that would cause an issue if you connected them, since it would just stop the diode from conducting.

I'd love to know what I'm missing here.

[bobmc-rmm]

The USB is protected by SS14, a low drop schottky 1 amp diode. The other input does not have this protection so a battery should not be connected. I see only 1 ground path.

[DavidAntliff]

@bobmc-rmm so there should be no issue with connecting the "3.3V output" GND on the left side of the board with the "5V input" GND on the right side of the board?