BoardPilotPCF8574 I/O expander module con ESP32
Alimentazione 3.3-5 V
Bus I2C
Indirizzo I2C
0x20 / 0x21 / 0x22 / 0x23 / 0x24 / 0x25 / 0x26 / 0x27 / 0x38 / 0x39 / 0x3A / 0x3B / 0x3C / 0x3D / 0x3E / 0x3F
Pin e collegamento all’ESP32
| Pin | Ruolo | Pin ESP32 | Note |
|---|---|---|---|
| GND | Massa | GND | |
| VCC | Alimentazione | 3V3 | |
| SDA | Dati I2C (SDA) | D21 | |
| SCL | Clock I2C (SCL) | D22 | |
| INT | Interrupt | D35 | Interrupt output, optional |
| P0 | Non collegato all’ESP32 | — | Expander I/O pins go to your LEDs or buttons, not to the ESP32 |
| P1 | Non collegato all’ESP32 | — | |
| P2 | Non collegato all’ESP32 | — | |
| P3 | Non collegato all’ESP32 | — | |
| P4 | Non collegato all’ESP32 | — | |
| P5 | Non collegato all’ESP32 | — | |
| P6 | Non collegato all’ESP32 | — | |
| P7 | 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(0x20);
bool found = Wire.endTransmission() == 0;
Serial.println(found ? "PCF8574 I/O expander module found at 0x20" : "Not found: check power, GND and SDA/SCL");
}
void loop() {}Fonti
- NXP PCF8574 / PCF8574A datasheet, Address 0x20 to 0x27 (PCF8574) or 0x38 to 0x3F (PCF8574A) via A0-A2
Provalo in 3D in BoardPilot
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Dati dei componenti: CC BY 4.0, riutilizzabili citando BoardPilot.