berry-pwm

Native PHP extension for sending PWM signals based on PHP-CPP and the great Pigpiod library on RaspberryPi.

Installation

Compile from source

Please make sure you installed the PHP-CPP library (guide) + pigpio (Guide). Clone and compile the source code:

git clone https://github.com/Volantus/berry-spi
cd berry-spi
make
sudo make install

Usage

Setup

PWM signals are managed by class PwmSender.

use Volantus\BerryPwm\PwmSender;

$sender = new PwmSender();

Setting pulse width

Sets the pulse width to 1600 microseconds on GPIO pin 14:

$sender->setPulseWidth(14, 1500);

Setting duty cycle

Duty cycle is controlled by setting a integer value out of a valid range. Default range: 255

The range may be modified by using $sender->setRange() method.

Example: Setting duty cycle to 150 out of 255 => ~59% on GPIO pin 14:

$sender->setDutyCycle(14, 150);

Setting range

Range of duty cycle may be modified for gaining more precision. Note: The real range used internally depends on the frequency and sample size, s. official Pigpiod documentation for more details.

Example: Setting range to 1024 on GPIO pin 14:

$sender->setRange(14, 1024);

Setting frequency

Set the frequency (in Hz) of the PWM to be used on the GPIO. The selectable frequencies depend upon the sample rate, s. official Pigpiod documentation for more details.

Example: Setting frequency to 250 Hz on GPIO pin 14:

$sender->setFrequency(14, 250);

Getting values

All configurable values may be read as well.

Reading different kind of values of GPIO pin 14:

$sender->getPulseWidth(14);
$sender->getDutyCycle(14);
$sender->getRange(14);
$sender->getFrequency(14);