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  1. #define ANALOG_PIN 0
  2.  
  3. void setup()
  4. {
  5.   Serial.begin(9600);
  6. }
  7.  
  8. void loop()
  9. {
  10.   if (Serial.available() > 0) {
  11.     if (Serial.read() == '1')
  12.       Serial.print(analogRead(ANALOG_PIN), DEC);
  13.   }
  14. }
  15. //E o do PHP:
  16.  
  17. <?php
  18. $port = fopen('/dev/ttyUSB0', 'w+');
  19. sleep(2);
  20. fwrite($port, '1');
  21. sleep(1);
  22. echo fgets($port);
  23. fclose($port);
  24. ?>
Success #stdin #stdout #stderr 0.02s 25756KB
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stdin
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Standard input is empty
stdout
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#define ANALOG_PIN 0

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  if (Serial.available() > 0) {
    if (Serial.read() == '1')
      Serial.print(analogRead(ANALOG_PIN), DEC);
  }
}
//E o do PHP:
stderr
copy 
PHP Warning:  fopen(/dev/ttyUSB0): failed to open stream: Permission denied in /home/LBUImH/prog.php on line 18
PHP Warning:  fwrite() expects parameter 1 to be resource, bool given in /home/LBUImH/prog.php on line 20
PHP Warning:  fgets() expects parameter 1 to be resource, bool given in /home/LBUImH/prog.php on line 22
PHP Warning:  fclose() expects parameter 1 to be resource, bool given in /home/LBUImH/prog.php on line 23
https://ideone.com/k3lfRl
language:
PHP (php 7.3.5)
created:
2 days ago
visibility:
public

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