Init I2C

[glebourg76]

Hi i try some code on a WiFi LoRa 32(V3). i installed heltec_unofficial.h and try your starting code

// Turns the 'PRG' button into the power button, long press is off
#define HELTEC_POWER_BUTTON // must be before "#include <heltec_unofficial.h>"

// Uncomment this if you have Wireless Stick v3
// #define HELTEC_WIRELESS_STICK

// creates 'radio', 'display' and 'button' instances
#include <heltec_unofficial.h>

void setup() {
heltec_setup();
Serial.println("Serial works");
// Display
display.println("Display works");
// Radio
display.print("Radio ");
int state = radio.begin();
if (state == RADIOLIB_ERR_NONE) {
display.println("works");
} else {
display.printf("fail, code: %i\n", state);
}
// Battery
float vbat = heltec_vbat();
display.printf("Vbat: %.2fV (%d%%)\n", vbat, heltec_battery_percent(vbat));
}

void loop() {
heltec_loop();
// Button
if (button.isSingleClick()) {
display.println("Button works");
// LED
for (int n = 0; n <= 100; n++) { heltec_led(n); delay(5); }
for (int n = 100; n >= 0; n--) { heltec_led(n); delay(5); }
display.println("LED works");
}
}

I get
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fce2820,len:0x118c
load:0x403c8700,len:0x4
load:0x403c8704,len:0xc20
load:0x403cb700,len:0x30e0
entry 0x403c88b8
E (40) i2c.master: I2C transaction unexpected nack detected
E (48) i2c.master: s_i2c_synchronous_transaction(924): I2C transaction failed
E (48) i2c.master: i2c_master_multi_buffer_transmit(1186): I2C transaction failed
Serial works

don't understand what i miss !!
thx