PCA9534 (community library)

Summary

PCA9534 I/O expander library with Particle like API calls It makes working with PCA9534 I/O expander pins easier, with familiar functions like pinMode() and digitalWrite().

Example Build Testing

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PCA9534 I/O Expander

PCA9534 GPIO expander library for Particle devices with Particle like API calls. It makes working with PCA9534 I/O expander pins easier, with familiar functions like pinMode() and digitalWrite(). Refer to the datasheet for more information about the chip.

Usage

Hardware connection (image removed)

Connect an LED to PCA9534 pin 0 chip, add the PCA9534 library to your project and follow this simple example:

#include "PCA9534.h"

#define GPIO_PIN_LED 0

PCA9534 gpio;

void setup() {
gpio.begin();
gpio.pinMode(GPIO_PIN_LED, OUTPUT);
}

void loop() {
gpio.digitalWrite(GPIO_PIN_LED, LOW); // LED On
delay(500);
gpio.digitalWrite(GPIO_PIN_LED, HIGH); // LED Off
delay(500);
}

See the examples folder for more details.

Documentation

PCA9534

Creates a new PCA9534 class to manage a PCA9534 chip.

#include "PCA9534.h"
...
...
PCA9534 gpio;
...
...
void setup() {
gpio.begin();
}

begin([i2caddr])

Initializes the device and performs initial I2C setup. This method should be called before any others are used.

Parameters:

void setup() {
gpio.begin(0x20);
}

pinMode(pin, mode)

Configures the specified pin to behave either as an input, inverted input, or output.

Parameters:

void setup() {
gpio.begin();
gpio.pinMode(0, OUTPUT);
}

digitalWrite(pin, value)

Writes a HIGH or a LOW value to a digital pin.

Parameters:

void loop() {
gpio.digitalWrite(0, LOW);
delay(500);
gpio.digitalWrite(0, HIGH);
delay(500);
}

digitalRead(pin)

Reads the value from a specified digital pin, either HIGH or LOW.

Note: when using INPUT_INVERTED on pinMode(), you will get the inverted status.

Parameters:

Returns:

uint8_t - The status of the pin either HIGH or LOW.

void loop() {
uint8_t buttonStatus = gpio.digitalRead(1);
if (buttonStatus == HIGH) {
gpio.digitalWrite(0, LOW); // LED On
} else {
gpio.digitalWrite(0, HIGH); // LED Off
}
}

LICENSE

Copyright 2017 Abdulrahman Saleh Khamis

Licensed under the MIT license

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