mirror of
https://github.com/xreef/PCF8574_library.git
synced 2024-08-30 18:12:18 +00:00
52 lines
1.1 KiB
Arduino
52 lines
1.1 KiB
Arduino
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/*
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* PCF8574 GPIO Port Expand
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* http://nopnop2002.webcrow.jp/WeMos/WeMos-25.html
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*
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* PCF8574 ----- WeMos
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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 ----- GPIO_4(PullUp)
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* SCL ----- GPIO_5(PullUp)
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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 "PCF8574.h" // https://github.com/xreef/PCF8574_library
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// Set i2c address
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PCF8574 pcf8574(0x20);
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void setup()
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{
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Serial.begin(9600);
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// Set pinMode to OUTPUT
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for(int i=0;i<8;i++) {
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pcf8574.pinMode(i, OUTPUT);
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}
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pcf8574.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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pcf8574.digitalWrite(pin, HIGH);
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delay(1000);
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pcf8574.digitalWrite(pin, LOW);
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delay(1000);
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pin++;
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if (pin > 7) pin = 0;
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}
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