PHP code example of microscrap / i2c

1. Go to this page and download the library: Download microscrap/i2c library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

microscrap / i2c example snippets




use Microscrap\Bindings\I2C\DataObjects\I2CBus;

$bus = i2c_open('/dev/i2c-1', 0x38);
if (is_null($bus)) {
    exit("Failed to open bus or bind slave address\n");
}

// Soft init/calibration command.
i2c_write($bus, pack('C*', 0xBE, 0x08, 0x00));
usleep(20_000);

// Trigger a measurement and wait for the typical 80 ms conversion time.
i2c_write($bus, pack('C*', 0xAC, 0x33, 0x00));
usleep(80_000);

// Read back 7 status+data bytes.
$raw = i2c_read($bus, 7);
$bytes = array_values(unpack('C7', $raw));

$rawHumidity = (($bytes[1] << 12) | ($bytes[2] << 4) | ($bytes[3] >> 4)) & 0xFFFFF;
$rawTemp     = ((($bytes[3] & 0x0F) << 16) | ($bytes[4] << 8) | $bytes[5]) & 0xFFFFF;

printf(
    "Temp: %.2f C  RH: %.2f %%\n",
    ($rawTemp / 1048576.0) * 200.0 - 50.0,
    ($rawHumidity / 1048576.0) * 100.0,
);

i2c_close($bus);




use Microscrap\Bindings\I2C\Enums\I2CMsgFlag;

$bus = i2c_open('/dev/i2c-1', 0x50);

$result = i2c_rdwr($bus, [
    ['flags' => 0,                          'data' => "\x00\x00"], // write register address
    ['flags' => I2CMsgFlag::M_RD->value,    'len'  => 16],         // read 16 bytes
]);

if ($result === false) {
    exit("RDWR transaction failed\n");
}

echo bin2hex($result), "\n";

i2c_close($bus);


final readonly class I2CBus {
    public int    $fd;   // open file descriptor
    public string $path; // device path (/dev/i2c-1)
    public int    $addr; // currently bound 7-bit slave address
}


use Microscrap\Bindings\I2C\Enums\I2CFuncFlag;

$caps = i2c_get_funcs($bus);
if ($caps & I2CFuncFlag::I2C_FUNC->value) {
    echo "Plain I2C messages supported\n";
}