PCAL6416A - Digital Write

This page covers driving a digital output pin on the PCAL6416A GPIO expander.

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Writing a pin

Connect an LED with a current-limiting resistor between A0 and GND.

#include "PCAL6416A-SOLDERED.h"

PCAL6416A expander;

void setup()
{
    Serial.begin(115200);
    expander.begin();

    expander.pinModePCAL(PCAL6416A_A0, OUTPUT);
}

void loop()
{
    expander.digitalWritePCAL(PCAL6416A_A0, HIGH);
    delay(1000);
    expander.digitalWritePCAL(PCAL6416A_A0, LOW);
    delay(1000);
}

expander.pinModePCAL()

Configures a GPIO pin on the PCAL6416A expander as an input or output.

Returns value: None.

Function parameters:

Type	Name	Description
uint8_t	pin	The GPIO pin to configure. Use a constant such as PCAL6416A_A0-PCAL6416A_A7 or PCAL6416A_B0-PCAL6416A_B7.
uint8_t	mode	Pin mode: INPUT, OUTPUT, INPUT_PULLUP, or INPUT_PULLDOWN.

expander.digitalWritePCAL()

Sets the output state of a selected GPIO pin on the PCAL6416A expander.

Returns value: None.

Function parameters:

Type	Name	Description
uint8_t	pin	The GPIO pin to write. Use a constant such as PCAL6416A_A0-PCAL6416A_A7 or PCAL6416A_B0-PCAL6416A_B7.
uint8_t	value	Output level: HIGH or LOW.

The LED should blink on and off once per second.

digitalWrite.ino

Full digital write example for the PCAL6416A GPIO expander