TCA9548A I2C multiplexer (8 channels) con ESP32

Alimentazione 3.3-5 V Bus I2C Indirizzo I2C 0x70 / 0x71 / 0x72 / 0x73 / 0x74 / 0x75 / 0x76 / 0x77

Pin e collegamento all’ESP32

Pin	Ruolo	Pin ESP32	Note
VIN	Alimentazione	3V3	3 to 5 V
GND	Massa	GND
SCL	Clock I2C (SCL)	D22
SDA	Dati I2C (SDA)	D21
RST	Non collegato all’ESP32	—	Reset, active LOW, pulled up. Leave unconnected
A0	Non collegato all’ESP32	—	Address select. All unconnected = 0x70
A1	Non collegato all’ESP32	—
A2	Non collegato all’ESP32	—
SD0	Non collegato all’ESP32	—	Channel SDA: to a sensor, not to the ESP32
SC0	Non collegato all’ESP32	—	Channel SCL: to a sensor, not to the ESP32
SD1	Non collegato all’ESP32	—
SC1	Non collegato all’ESP32	—
SD2	Non collegato all’ESP32	—
SC2	Non collegato all’ESP32	—
SD3	Non collegato all’ESP32	—
SC3	Non collegato all’ESP32	—
SD4	Non collegato all’ESP32	—
SC4	Non collegato all’ESP32	—
SD5	Non collegato all’ESP32	—
SC5	Non collegato all’ESP32	—
SD6	Non collegato all’ESP32	—
SC6	Non collegato all’ESP32	—
SD7	Non collegato all’ESP32	—
SC7	Non collegato all’ESP32	—

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(0x70);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "TCA9548A I2C multiplexer (8 channels) found at 0x70" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Fonti

Texas Instruments TCA9548A datasheet, Slave address 1110 A2 A1 A0 (0x70 to 0x77); control register selects channels
Adafruit TCA9548A 1-to-8 I2C multiplexer breakout guide, Pinouts; channel pull-ups must be on the sensor boards

Provalo in 3D in BoardPilot

BoardPilot Dati del componente (JSON)

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