ESP8266 can't detect DS18B20 Temperature Sensor

kmin · July 20, 2025, 5:57pm

Sorry for going off topic, just my curiosity..
Looks like nano esp32 is named arduino_nano_nora on espressif library and nano32 is something else..

github.com/espressif/arduino-esp32

variants/nano32/pins_arduino.h

master

#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include <stdint.h>

static const uint8_t LED_BUILTIN = 16;
#define BUILTIN_LED LED_BUILTIN  // backward compatibility
#define LED_BUILTIN LED_BUILTIN  // allow testing #ifdef LED_BUILTIN

static const uint8_t BUILTIN_KEY = 0;

static const uint8_t TX = 1;
static const uint8_t RX = 3;

static const uint8_t SDA = 21;
static const uint8_t SCL = 22;

static const uint8_t SS = 5;
static const uint8_t MOSI = 23;
static const uint8_t MISO = 19;

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github.com/espressif/arduino-esp32

variants/arduino_nano_nora/pins_arduino.h

master

#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include <stdint.h>

#define USB_VID 0x2341
#define USB_PID 0x0070

#ifndef __cplusplus
#define constexpr const
#endif

// primary pin names

#if defined(BOARD_HAS_PIN_REMAP) && !defined(BOARD_USES_HW_GPIO_NUMBERS)

// Arduino style definitions (API uses Dx)

static constexpr uint8_t D0 = 0;  // also RX
static constexpr uint8_t D1 = 1;  // also TX

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ESP8266 can't detect DS18B20 Temperature Sensor

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