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I/O Expander Shield with MCP23017

I/O Expander Shield with MCP23017

Añadile mas puertos GPIO a tu Arduino con este Shield!

COD: LS101101039

Peso: 0.050 Kg

Disponibilidad: En Stock

Su correo electrónico:

ARS 473.00

Cantidad:

El producto no está disponible para la venta en este momento

Características

Product Description

I/O Expander shield is a shield used to expand the number of I/Os of an Arduino Uno. It is based on the chipset MCP23017. The chipset MCP23017 communicates with Arduino Uno through I2C interface. It adds GPIOA and GPIOB, a total of 16 I/Os. There are two LEDs and two buttons on the shield. User can decide if they want to use the built-in LED/buttons or not by using the 4-bit DIP switch.

Features:

 16 bidirectional I/O ports. Default is input state.

  • High-speed IIC interface (MCP23017): 100kHz, 400kHz, 1.7MHz
  • Three hardware address pins allow up to eight devices on the bus
  • Configurable interrupt output pin: can be configured for active-high (output), active-low (output) or open-drain (output)
  • INTA and INTB can be configured to work independently or jointly
  • Configurable interrupt sources: the interrupt changes according to the configured register defaults or pin level changes
  • External reset input
  • Low standby current: 1μA (max)
  • Operating voltage:
    • 1.8V to 5.5V (-40 ° C to +85 ° C)
    • 2.7V to 5.5V (-40 ° C to +85 ° C)
    • 4.5V to 5.5V (-40 ° C to +125 ° C)

Download:

Code

#include 
 
const byte  mcp_address=0x20;      // I2C Address of MCP23017 Chip
const byte  GPIOA=0x12;            // Register Address of Port A
const byte  GPIOB=0x13;            // Register Address of Port B
const byte  IODIRA=0x00;            // IODIRA register
const byte  IODIRB=0x01;            // IODIRB register
 
void setup()
{
  //Send settings to MCP device
  Wire.begin();              // join i2c bus (address optional for master)
  Wire.beginTransmission(mcp_address);
  Wire.write((byte)IODIRA); // IODIRA register
  Wire.write((byte)0x03); // set GPIOA-0/GPIOA-1 to inputs
  Wire.endTransmission();
}
 
void loop()
{
  Wire.beginTransmission(mcp_address);
  Wire.write((byte)GPIOA); // set MCP23017 memory pointer to GPIOB address
  Wire.endTransmission();
  Wire.requestFrom(0x20, 1); // request one byte of data from MCP20317
  int inputs=Wire.read(); // store the incoming byte into "inputs"
 
  if((inputs&0x01)==0)
  {
    Wire.beginTransmission(mcp_address);
    Wire.write(GPIOA);    // address bank A
    Wire.write((byte)0x04);  // value to send GPIOA-2 HIGH
    Wire.endTransmission();
  }
  if((inputs&0x02)==0)
  {
    Wire.beginTransmission(mcp_address);
    Wire.write(GPIOA);    // address bank A
    Wire.write((byte)0x08);  // value to send GPIOA-3 HIGH
    Wire.endTransmission();
  }
  else
  {
    Wire.beginTransmission(mcp_address);
    Wire.write(GPIOA);     // address bank A
    Wire.write((byte)0x00);  // value to send GPIOA LOW
    Wire.endTransmission();
  }
}
[/syntaxhighlight]
 
==Resources==
*[http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf Datasheet]

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