MCP23008 8-bit I/O expander (DIP-18) 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
SCL	Clock I2C (SCL)	D22
SDA	Dati I2C (SDA)	D21
A2	Non collegato all’ESP32	—	Address bit: tie to GND or VDD
A1	Non collegato all’ESP32	—
A0	Non collegato all’ESP32	—
RESET	Non collegato all’ESP32	—	Reset, active LOW. Tie to VDD
NC	Non collegato all’ESP32	—	Not connected
INT	Interrupt	D35	Interrupt output, optional
VSS	Massa	GND
GP0	Non collegato all’ESP32	—	Expander I/O: to your LEDs or buttons, not to the ESP32
GP1	Non collegato all’ESP32	—
GP2	Non collegato all’ESP32	—
GP3	Non collegato all’ESP32	—
GP4	Non collegato all’ESP32	—
GP5	Non collegato all’ESP32	—
GP6	Non collegato all’ESP32	—
GP7	Non collegato all’ESP32	—
VDD	Alimentazione	3V3

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 ? "MCP23008 8-bit I/O expander (DIP-18) found at 0x20" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Fonti

Microchip MCP23008 datasheet, Pinout (PDIP 18); address 0100 A2 A1 A0 (0x20 to 0x27); supply 1.8 to 5.5 V; needs external I2C pull-ups

Provalo in 3D in BoardPilot

BoardPilot Dati del componente (JSON)

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