MCP23008 test code

mcp23008.ino

#include <Adafruit_MCP23X08.h>

Adafruit_MCP23X08 mcp;
Adafruit_MCP23X08 mcp2;

void setup() {
  Serial.begin(115200);
  mcp.begin_I2C(0x20);
  mcp2.begin_I2C(0x24);

  mcp.pinMode(0, INPUT);
  mcp.pinMode(1, INPUT);
  mcp.pinMode(2, INPUT);
  mcp.pinMode(3, INPUT);
  mcp.pinMode(4, INPUT);
  mcp.pinMode(5, INPUT);
  mcp.pinMode(6, INPUT);
  mcp.pinMode(7, INPUT);

  for(uint8_t address = 0; address < 8; address++){
    mcp2.pinMode(address, INPUT);
  }
}

void loop() {
  for(int address = 0; address < 8; address++){
    Serial.print((mcp.digitalRead(address)==HIGH?1:0));
    Serial.print(" ");
  }for(int address = 0; address < 7; address++){
    Serial.print((mcp2.digitalRead(address)==HIGH?1:0));
    Serial.print(" ");
  }
  Serial.println((mcp2.digitalRead(7)==HIGH?1:0));
}