MCP23017 16-bit I/O expander con ESP32

Alimentazione 3.3-5 V Bus I2C Indirizzo I2C 0x20 / 0x21 / 0x22 / 0x23 / 0x24 / 0x25 / 0x26 / 0x27

Pin e collegamento all’ESP32

Pin	Ruolo	Pin ESP32	Note
VCC	Alimentazione	3V3
GND	Massa	GND
SCL	Clock I2C (SCL)	D22
SDA	Dati I2C (SDA)	D21
RESET	Ingresso (lo pilota l’ESP32)	D25	Must be HIGH to run: tie to VCC
INTA	Interrupt	D35
INTB	Interrupt	VP
A0	Non collegato all’ESP32	—	Address bit 0
A1	Non collegato all’ESP32	—	Address bit 1
A2	Non collegato all’ESP32	—	Address bit 2. Expander I/O pins GPA0-7 and GPB0-7 go to your LEDs or buttons

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(0x20);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "MCP23017 16-bit I/O expander found at 0x20" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Fonti

Microchip MCP23017 datasheet, Hardware address pins A0-A2: 0x20 to 0x27
Microchip MCP23017 datasheet, RESET is active LOW

Provalo in 3D in BoardPilot

BoardPilot Dati del componente (JSON)

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