LM75A temperature (CJMCU-75) con ESP32

Alimentazione 3.3-5 V Bus I2C Indirizzo I2C 0x48 / 0x49 / 0x4A / 0x4B / 0x4C / 0x4D / 0x4E / 0x4F Misura temperatura

Pin e collegamento all’ESP32

Pin	Ruolo	Pin ESP32	Note
VCC	Alimentazione	3V3	Use 3V3 so the I2C lines stay at 3.3 V
GND	Massa	GND
SDA	Dati I2C (SDA)	D21
SCL	Clock I2C (SCL)	D22
OS	Interrupt	D35	Over-temperature output (open drain), optional
A0	Non collegato all’ESP32	—	Address bit 0. Check the board: some leave A0 to A2 floating
A1	Non collegato all’ESP32	—	Address bit 1
A2	Non collegato all’ESP32	—	Address bit 2

Collegamento consigliato per l’ESP32 DevKit a 30 pin, evitando i pin della flash, di sola lettura e di strapping. BoardPilot lo controlla mentre colleghi.

Codice di partenza (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x48);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "LM75A temperature (CJMCU-75) found at 0x48" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Fonti

NXP LM75A datasheet, Slave address 1001 A2 A1 A0 = 0x48 to 0x4F; supply 2.8 to 5.5 V
NXP LM75A datasheet, No ID register; the pin order here is one common board layout

Provalo in 3D in BoardPilot

BoardPilot Dati del componente (JSON)

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Dati dei componenti: CC BY 4.0, riutilizzabili citando BoardPilot.