ขยายขา Input และ Output ของ ESP8266 แบบ I2C ด้วย  IC MCP23017
 

• ติดต่อแบบ I2C ใช้สายสัญญาณเพียง 2 เส้น สามารถขยายได้ถึง 16 ขา
• กำหนดได้ว่าจะให้ขาเป็น Input หรือ Output จากโคดได้
• สามารถกำหนด address ได้ 8 ตำแหน่ง
• ทำให้ต่อร่วมกันได้ 8 ตัว สามารถขยายขาสูงสุดได้ถึง 128 I/O โดยใช้สายสัญญาณแค่ 2 เส้น

I2C MCP23017 I/O Expander with Serial Interface


ต่อวงจร MCP2307 ESP8266 ดังนี้

• VCC - 3.3V
• GND - GND
• 12 - D1
• 13 - D2

ขา IC - PIN 1 - 8 2 - 9 3 - 10 4 - 11 5 - 12 6 - 13 7 - 14 8 - 15

28 - 7 27 - 6 26 - 5 25 - 4 24 - 3 23 - 2 22 - 1 21 - 0

#include 
#include "Adafruit_MCP23017.h"

// Basic pin reading and pullup test for the MCP23017 I/O expander
// public domain!

// Connect pin #12 of the expander to Analog 5 (i2c clock)
// Connect pin #13 of the expander to Analog 4 (i2c data)
// Connect pins #15, 16 and 17 of the expander to ground (address selection)
// Connect pin #9 of the expander to 5V (power)
// Connect pin #10 of the expander to ground (common ground)
// Connect pin #18 through a ~10kohm resistor to 5V (reset pin, active low)

// Output #0 is on pin 21 so connect an LED or whatever from that to ground

Adafruit_MCP23017 mcp;

void setup() {
mcp.begin(); // use default address 0

mcp.pinMode(0, OUTPUT);
}


// flip the pin #0 up and down

void loop() {
delay(100);

mcp.digitalWrite(0, HIGH);

delay(100);

mcp.digitalWrite(0, LOW);
}

#include 
#include "Adafruit_MCP23017.h"

// Basic pin reading and pullup test for the MCP23017 I/O expander
// public domain!

// Connect pin #12 of the expander to Analog 5 (i2c clock)
// Connect pin #13 of the expander to Analog 4 (i2c data)
// Connect pins #15, 16 and 17 of the expander to ground (address selection)
// Connect pin #9 of the expander to 5V (power)
// Connect pin #10 of the expander to ground (common ground)
// Connect pin #18 through a ~10kohm resistor to 5V (reset pin, active low)

// Input #0 is on pin 21 so connect a button or switch from there to ground

Adafruit_MCP23017 mcp;

void setup() {
mcp.begin(); // use default address 0

mcp.pinMode(0, INPUT);
mcp.pullUp(0, HIGH); // turn on a 100K pullup internally

Serial.begin(115200);
}



void loop() {
Serial.println(mcp.digitalRead(0));
delay(2000);
}

#include 
#include "Adafruit_MCP23017.h"

// Basic pin reading and pullup test for the MCP23017 I/O expander
// public domain!

// Connect pin #12 of the expander to Analog 5 (i2c clock)
// Connect pin #13 of the expander to Analog 4 (i2c data)
// Connect pins #15, 16 and 17 of the expander to ground (address selection)
// Connect pin #9 of the expander to 5V (power)
// Connect pin #10 of the expander to ground (common ground)
// Connect pin #18 through a ~10kohm resistor to 5V (reset pin, active low)

// Output #0 is on pin 21 so connect an LED or whatever from that to ground

Adafruit_MCP23017 mcp;

int pin_led = 15; // IC ขา 8
int pin_sw = 8; // IC ขา 1
void setup() {
mcp.begin(); // use default address 0
mcp.pinMode(pin_led, OUTPUT);
mcp.pinMode(pin_sw,INPUT);
mcp.pullUp(pin_sw,HIGH);
}


// flip the pin #0 up and down

void loop() {
delay(100);
int val = mcp.digitalRead(pin_sw);
if(val==0){
mcp.digitalWrite(pin_led, 1);
}else if(val==1){
mcp.digitalWrite(pin_led, 0);
}

}

คลิปวีดีโอสอน Arduino ESP8266 ขยายขา Input และ Output ของ ESP8266 แบบ I2C ด้วย IC MCP23017