Created
February 26, 2017 00:32
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<?php | |
if($argc != 2) { | |
echo 'Usage: '.$argv[0].' Port'."\n"; | |
echo 'example: '.$argv[0].' /dev/ttyUSB0'."\n"; | |
exit(2); | |
} | |
$port = @fopen($argv[1], 'r+'); | |
if(!$port) { | |
echo 'Could not open port '.$argv[1]."\n"; | |
exit(3); | |
} | |
$out=fopen('data.raw', 'a'); | |
$b=0; | |
$buffer = array(); | |
while(!feof($port)) { | |
$curByte = ord(fread($port, 1)); | |
$buffer[] = $curByte; | |
while(count($buffer) > 0 && $buffer[0] != 0xAA) { | |
array_shift($buffer); | |
} | |
if(count($buffer) < 10) continue; | |
if($buffer[9] != 0xAB) { | |
//Well, this sucks… Remove possible SOT and retry | |
array_shift($buffer); | |
continue; | |
} | |
switch($buffer[1]) { | |
case 0xC0: | |
sds011_getData($buffer); | |
break; | |
//case 0xC5: | |
//Todo - Command response | |
//break; | |
default: | |
echo '['.strftime("%Y-%m-%d %H:%M:%S").'] -'; | |
foreach ($buffer as $byte) { | |
echo ' 0x'.str_pad(dechex($byte), 2, '0', STR_PAD_LEFT); | |
} | |
$data_chksum=0; | |
for($i = 2; $i < 8; $i++) $data_chksum+=$buffer[$i]; | |
$data_chksum %= 256; | |
if($data_chksum == $buffer[8]) { | |
echo ' - CRC OK'; | |
}else{ | |
echo ' - CRC ERR'; | |
} | |
echo "\n"; | |
} | |
for($i=0; $i<=9; $i++) array_shift($buffer); //Remove Packet | |
} | |
function sds011_getData($buffer) { | |
global $cmd_expect_dat; | |
$data_pm10 = $buffer[4] + ($buffer[5] << 8); | |
$data_pm25 = $buffer[2] + ($buffer[3] << 8); | |
$data_devid = $buffer[6] + ($buffer[7] << 8); | |
$data_chksum = 0; | |
for($i = 2; $i < 8; $i++) $data_chksum+=$buffer[$i]; | |
$data_chksum %= 256; | |
if($data_chksum != $buffer[8]) { | |
echo 'Checksum error: Got 0x'.str_pad(dechex($buffer[9]), 2, '0', STR_PAD_LEFT).' - expected: 0x'.str_pad(dechex($data_chksum), 2, '0', STR_PAD_LEFT)."\n"; | |
//exit(5); | |
} | |
echo '['.strftime("%Y-%m-%d %H:%M:%S").'] - '; | |
echo 'SDS device ID: 0x'.str_pad(dechex($data_devid), 2, '0', STR_PAD_LEFT)." - "; | |
echo 'Particle 2.5µm: '.$data_pm25." - "; | |
echo 'Particle 10.0µm: '.$data_pm10."\n"; | |
return array( | |
'devId' => $data_devid, | |
'pm10' => $data_pm10, | |
'pm25' => $data_pm25 | |
); | |
} | |
?> |
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