I think Arduino by default assigns two GPIOs Here is pins_arduino.h file for esp32c3 variant in 2.0.2 core (maybe spécific assignements for specific -C3 boards) #ifndef Pins_Arduino_h #define Pins_Arduino_h #include <stdint.h> #define EXTERNAL_NUM_INTERRUPTS 22 #define NUM_DIGITAL_PINS 22 #define N...

TWO Uarts ... and their RxTx nearly anywhere

on my last -C3 boards I found Uart0 on GPIO20 and GPIO21 pins (routed to CH340 chip)

I choosed 18 and 19 for Uart1. just beside .....

Use UART1 (= Serial1) for your barcode reader,
UART0 (= Serial) is for UART/USB chip through GPIOs 20 and 21 on DEVKIT Board

Hi

No difference, same json file on two links pointing to :

"name": "esp32",
"maintainer": "Espressif Systems",
"websiteURL": "https://github.com/espressif/arduino-esp32",

Hi !

According to the following schematic GPIO16 serves as Chip Select pin for the on board PSRAM
https://i1.wp.com/randomnerdtutorials.c ... ttachment]

Hi Il your Lolin32 a Lolin32 Lite one ? I solved such problem with adding a pull up up resistor on SPI Flash CS (pin 1) During deep-sleep scope show floating Flash SPI CS pin (driven from GPIO11) without this resistor and then SPI Flash continue to consume some current. Lolin32Lite schematic attached

Hi

On 2 LOLIN32 Lite board I had to solder au pull up resitor between 25Q32 /CS and Vcc pins (pins 1 and 8)
/CS was floating during deep-sleep (seen on scope) and current excessive just as you desctribe.

No metal case on Lolin32 Lite , easy job !!