67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
#include "Arduino.h"
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/*
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* PCF8575 GPIO Port Expand
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* Blink all led
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* by Mischianti Renzo <http://www.mischianti.org>
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*
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* https://www.mischianti.org/2019/01/02/pcf8575-i2c-digital-i-o-expander-fast-easy-usage/
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*
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*
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* PCF8575 ----- Esp32
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* A0 ----- GRD
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* A1 ----- GRD
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* A2 ----- GRD
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* VSS ----- GRD
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* VDD ----- 5V/3.3V
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* SDA ----- 21
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* SCL ----- 22
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*
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* P0 ----------------- LED0
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* P1 ----------------- LED1
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* P2 ----------------- LED2
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* P3 ----------------- LED3
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* P4 ----------------- LED4
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* P5 ----------------- LED5
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* P6 ----------------- LED6
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* P7 ----------------- LED7
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*
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*/
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#include "Arduino.h"
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#include "PCF8575.h" // https://github.com/xreef/PCF8575_library
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// Instantiate Wire for generic use at 400kHz
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TwoWire I2Cone = TwoWire(0);
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// Instantiate Wire for generic use at 100kHz
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TwoWire I2Ctwo = TwoWire(1);
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// Set i2c address
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PCF8575 pcf8575(&I2Ctwo, 0x20);
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// PCF8575 pcf8575(&I2Ctwo, 0x20, 21, 22);
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// PCF8575(TwoWire *pWire, uint8_t address, uint8_t interruptPin, void (*interruptFunction)() );
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// PCF8575(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl, uint8_t interruptPin, void (*interruptFunction)());
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void setup()
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{
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Serial.begin(112560);
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I2Cone.begin(16,17,400000); // SDA pin 16, SCL pin 17, 400kHz frequency
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// Set pinMode to OUTPUT
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for(int i=0;i<8;i++) {
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pcf8575.pinMode(i, OUTPUT);
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}
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pcf8575.begin();
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}
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void loop()
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{
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static int pin = 0;
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pcf8575.digitalWrite(pin, HIGH);
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delay(400);
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pcf8575.digitalWrite(pin, LOW);
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delay(400);
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pin++;
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if (pin > 7) pin = 0;
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}
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