X-Git-Url: http://git.rot13.org/?p=air-quality;a=blobdiff_plain;f=zph02.pl;h=aeaaffbb686518eb449507712e22f7316095b511;hp=50aadcb21475dcec9e28420cc17ff95f018da059;hb=452f7e0d2461923ab031789c222268779b6f80d9;hpb=390a683649fd1e1a505e3f4ee55fb9048e3e5f56

diff --git a/zph02.pl b/zph02.pl
index 50aadcb..aeaaffb 100755
--- a/zph02.pl
+++ b/zph02.pl
@@ -3,9 +3,11 @@ use warnings;
 use strict;
 # sudo apt install libdevice-serialport-perl libdata-dump-perl
 use Device::SerialPort;
+use Time::HiRes;
 use Data::Dump qw(dump);
 
-my $port = shift @ARGV || '/dev/ttyUSB0';
+my $port = shift @ARGV || '/dev/ttyUSB1';
+$port = '/dev/serial/by-path/pci-0000:00:1a.7-usb-0:5.4:1.0-port0';
 my $influx_url = shift @ARGV || 'http://10.13.37.229:8186/write?db=telegraf';
 $influx_url = 'http://10.13.37.92:8086/write?db=rot13';
 
@@ -22,12 +24,24 @@ $s->read_const_time(10);
 while (1) {
 
 	my ($len, $string) = $s->read(9);
+	my $t = int( Time::HiRes::time() * 1_000_000_000 );
+	die $! if ! defined($len);
 	if ( $len > 0 ) {
 		my @v = unpack('C*', $string);
-		warn "# $len ",dump($string), dump( @v ), $/;
+		#warn "# $len ",dump($string), dump( @v ), $/;
+
+		my $sum = 0;
+		# -2 is specified in datasheet, next byte is 0 so it's same as -1
+		foreach my $i ( 0 .. $#v - 2 ) {
+			$sum += $v[$i];
+			$sum = $sum & 0xff;
+		}
+		$sum = ~$sum & 0xff;
+
+		my $checksum = $v[8];
 		my $pcnt = $v[3] + ( $v[4] / 100 );
-		if ( $v[0] == 0xff ) {
-			my $influx = "zph02,dc=trnjanska pm25_pcnt=$pcnt";
+		if ( $v[0] == 0xff && $sum == $checksum ) {
+			my $influx = "zph02,dc=trnjanska pm25_pcnt=$pcnt $t";
 			print "$influx\n";
 			system "curl --silent -XPOST '$influx_url' --data-binary '$influx'"
 		}