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implementing Tire Pressure Monitoring System PHP version
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35 changes: 35 additions & 0 deletions
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TDDMicroExercises/PHP/TirePressureMonitoringSystem/Alarm.php
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<?php | ||
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class Alarm | ||
{ | ||
const LOW_PRESSURE_TRESHOLD = 17; | ||
const HIGH_PRESSURE_TRESHOLD = 21; | ||
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private $sensor; | ||
private $alarmOn; | ||
private $alarmCount; | ||
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public function __construct() { | ||
$this->sensor = new Sensor(); | ||
$this->alarmOn = false; | ||
$this->alarmCount = 0; | ||
} | ||
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public function check() | ||
{ | ||
$psiPressureValue = $this->sensor->popNextPressurePsiValue(); | ||
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if ($psiPressureValue < Alarm::LOW_PRESSURE_TRESHOLD | ||
|| Alarm::HIGH_PRESSURE_TRESHOLD < $psiPressureValue) { | ||
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$this->alarmOn = true; | ||
$this->alarmCount += 1; | ||
} | ||
} | ||
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public function alarmOn() | ||
{ | ||
return $this->alarmOn; | ||
} | ||
} |
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TDDMicroExercises/PHP/TirePressureMonitoringSystem/Sensor.php
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<?php | ||
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class Sensor | ||
{ | ||
const OFFSET = 16; | ||
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public static function SamplePressure() | ||
{ | ||
// placeholder implementation that simulate a real sensor in a real tire | ||
$pressureTelemetryValue = floor(6 * rand() * rand()); | ||
return $pressureTelemetryValue; | ||
} | ||
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public function popNextPressurePsiValue() | ||
{ | ||
$pressureTelemetryValue = self::SamplePressure(); | ||
return self::OFFSET + $pressureTelemetryValue; | ||
} | ||
} |