document arduino mq7 setup

[air-quality] / mh-z19b.pl

diff --git a/mh-z19b.pl b/mh-z19b.pl
index c925661..c2f8ffe 100755 (executable)
--- a/mh-z19b.pl
+++ b/mh-z19b.pl
@@ -6,7 +6,7 @@ use Device::SerialPort;
 use Time::HiRes;
 use Data::Dump qw(dump);
 
 use Time::HiRes;
 use Data::Dump qw(dump);
 

-my $port = shift @ARGV || '/dev/ttyUSB0';
+my $port = shift @ARGV || '/dev/serial/by-path/pci-0000:00:1a.7-usb-0:5.3.4:1.2';

 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';
 
 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';
 


@@ -16,7 +16,7 @@ $s->databits(8);
 $s->parity('none');
 $s->stopbits(1);
 $s->handshake('none');
 $s->parity('none');
 $s->stopbits(1);
 $s->handshake('none');

-$s->read_char_time(0);
+$s->read_char_time(1);

 $s->read_const_time(10);
 $s->debug(1);
 
 $s->read_const_time(10);
 $s->debug(1);
 


@@ -29,7 +29,9 @@ while (1) {
        die $! if ! defined($len);
        if ( $len > 0 ) {
                my @v = unpack('C*', $string);
        die $! if ! defined($len);
        if ( $len > 0 ) {
                my @v = unpack('C*', $string);

-               #warn "# $len ",dump($string), dump( @v ), $/;
+               if ( $#v < 8 ) {
+                       die "# $len ",dump($string), dump( @v ), $/;
+               }

 
                my $sum = 0;
                foreach my $i ( 1 .. $#v - 1 ) {
 
                my $sum = 0;
                foreach my $i ( 1 .. $#v - 1 ) {