ESP32 Forum

horace99

try GPIO4 and GPIO5, e.g.

#define RXD1 4
#define TXD1 5

void setup() {
  // initialize both serial ports:
  Serial.begin(115200);   // note Serial is on the TX and RX pins NOT the USB
  delay(2000);
  Serial1.begin(9600, SERIAL_8N1, RXD1, TXD1);

horace99

I found that the latest drivers installed on Windows 10 and 11 don't work with some dev boards using the CH340, e.g. a ESP32-CAM and some ES8266
I rolled back the driver following instructions in https://learn.sparkfun.com/tutorials/how-to-install-ch340-drivers/all to version 3.4.2014.8
win10 and 11 ...

horace99

can you post the program which gave the error messages?

horace99

have a look at the ESP-IDF ESP32S3 OTG VCP example https://forum.arduino.cc/t/esp32-s3-as- ... /1412367/8

horace99

using Arduino IDE 2.3.4 ESP32 core 3.3.2 running Bluetooth Classic example SerialToSerialBT serial monitor displays

The device with name "ESP32-BT-Slave" is started.
Now you can pair it with Bluetooth!

Android phone connects OK and transfers data using Bluetooth terminal app

However ...

horace99

try this code

// ESP32-C6_Dev_Board SIM_A7670E Serial1 test - for loopback test connect pins RX and TX
// https://learn.adafruit.com/adafruit-esp32-c6-feather/pinouts

// NOTE: enable "USB CDC on Boot"
// NOTE: SIM_A7670E requires 5V power

#define RXD1 4 // RX
#define TXD1 5 // TX

// for RS232 ...

horace99

the code of post 1 compiles and links OK on my PC
Windows 11 Arduino IDE 2.3.4 ESP32 core 3.3.2

which ESP32 core are you using?
have you tried the BLE examples under File>Examples>BLE ?

horace99

have a look at the section on LEDC in https://docs.espressif.com/projects/ard ... o_3.0.html which gives details the new APIs

horace99

did you try the code in my previous post which worked on a ESP32-C3-MINI-1 ?
did it compile, link and upload OK? if not what errors did you get?
did it work? if not what was the serial monitor output?

horace99

found an example ESP-NOW code which may help
NOTE: ESP-NOW has changed from ESP32 core 2.x to 3.x - see https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_now.html
you may find some of the example code online is using ESP32 core V2

ESP-NOW transmitter works using ...

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