Doubt about simple use of RX TX

Olivier · October 28, 2020, 3:08pm

Hi everybody,

My problem is simple / I need to communicate between my Heltec WIFI lora 32(V2) and an Arduino Uno.
It does not work but I am not sure on my solution

I use the Pin called RX (U0_RXD - GPIO3) on the HelTec
and connected it to the TX Pin on the arduino uno
I use the Pin called TX (U0_TXD - GPIO1) on the HelTec
and connected it to the RX Pin on the arduino uno
For the Heltec program, I use the command serial2.begin(9600)
For the Uno program, I use the command serial.begin(9600)

But then, after it does not work.
(I am able to communicate betwen two arduino Uno)

Does anybody can check my configuration ?
Thanks lot

Oliver

jasonXu · November 3, 2020, 3:30am

hi,

maybe you can refer this:
%E5%9B%BE%E7%89%87

github.com

Heltec-Aaron-Lee/WiFi_Kit_series/blob/master/esp32/variants/wifi_lora_32_V2/pins_arduino.h

#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include <stdint.h>

#define WIFI_LoRa_32_V2 true
#define DISPLAY_HEIGHT 64
#define DISPLAY_WIDTH  128

#define EXTERNAL_NUM_INTERRUPTS 16
#define NUM_DIGITAL_PINS        40
#define NUM_ANALOG_INPUTS       16

#define analogInputToDigitalPin(p)  (((p)<20)?(esp32_adc2gpio[(p)]):-1)
#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
#define digitalPinHasPWM(p)         (p < 34)

static const uint8_t LED_BUILTIN = 25;
#define BUILTIN_LED  LED_BUILTIN // backward compatibility

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