altRobots
/robotigs/icons/actuator.pngActuatoren
/robotigs/icons/printboards.pngAlgemeen
/robotigs/icons/chassis.pngChassis
/robotigs/icons/florigs.pngFlorigs
/robotigs/icons/interfacing.gifInterfacing
/robotigs/icons/microphone_icon.pngMuziek
/robotigs/icons/musicKey_icon.pngMuzikanten
/robotigs/icons/shield.pngSchildjes
/sys/icons/sensors.pngSensors
/robotigs/icons/languages.pngTalen
/robotigs/icons/battery.pngVoedingen
/sys/icons/microController.pngµControllers
altContact
Gas sensors"); echo ("  "); } ?>  "); /* echo (""); echo (" "); //Show pencil as button */ ?> alt  

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"); $counter = 0; $aantal = str_word_count($pict_list, 0, "0123456789"); $lijst = str_word_count($pict_list, 1, "0123456789"); while($counter < $aantal){ $pictkey = $lijst[$counter]; $qryy1 = ("SELECT * FROM illustrations WHERE ill_id = $pictkey ;"); $resulty1 = pg_query($con1, $qryy1); while($row = pg_fetch_array($resulty1)){ //Fields accesible by their name foreach( $row AS $key => $val ){ $$key = stripslashes( $val ); } } $image = ("/robotigs/documentatie/plaatjes/$ill_name"); $pictfull = str_replace('_small', '', $image); //Pictfull=biggest version $alt = ("Just wait till your 57...."); $txtname = get_txt($con1, 18, $koekje[2], $ill_id); //Robot illustrations subtitles echo (""); echo (''. $alt .'
'); $nummer = $counter + 1; $txtAfb = get_txt($con1, 9, $koekje[2], 3865); //Pic Afb if ($koekje[0]>0 and $koekje[3]>0){ //User is logged in and translates echo ("$txtAfb $nummer: "); echo ("$txtname"); echo ("
"); echo ("Ontkoppelen "); if ($counter==0){ echo ("Up "); }else{ echo ("Up "); } if ($nummer == $aantal){ echo ("Down"); }else{ echo ("Down"); } }else{ //Else of if Meaning the current useer is logged in echo ("$txtAfb $nummer: $txtname"); } echo ('

'); //End of this picture $counter++; //Prepair for next picture } echo (''); //All pictures are printed } //End of if there are 1 or more pictures to be printed ---------------------- ?>

Beschrijving
Some salts show a varying resistance when contacted with certain gases. Therefore these salts are used in Taguchi Gas Sensors (wiki). All these salts are just like your table salt very sensitive to water vapor. Water vapor will saturate the sensor, preventing the sensor from working correctly. That is the reason why each sensor contains a heater. It is only there to burn out any moisture.

As soon as the power is connected a red LED will light up as power indicator. A green led is the D0 alarm indicator.

The diameter of the plastic housings is 17mm. The sensors with a metal housing are 20mm at the base.

Software

Arduino has a page about this set of sensors. Also this air monitoring site gives some useful information. The data connection is TTL level. There are 2 output pins on each brick:
  • D0 Alarm
    This pin just outputs LOW or HIGH, depending on the state of the alarm. LOW=Alarm, HIGH=No alarm. The level of this alarm switch can be set with the on-board pot meter. This alarm is also signaled by a green on-board LED on each sensor. It will burn on alarm.
  • A0 analog signal
    This pin gives an analog read out of the sensor value.

Type EUR Gevoeligheid mA Behuizing
MQ2 1,94 H2, LPG, CH4, CO, Alcohol, Propaan en Rook <800 Behuizing A
MQ3 1,95 Alcohol <750 Behuizing B oranje
MQ4 1,95 Methaan <750 Behuizing A
MQ5 6.06 LPG, CH4, CO, H2, Alcohol <800 Behuizing A
MQ6 2.18 LPG, propaan, butaan <750 Behuizing A
MQ7 2.37 CO 350 Behuizing B grijs
MQ8 4.80 H2 <800 Behuizing A
MQ9 4.80 LPG, CO, CH4 <340 Behuizing A
MQ135 3.84 NH3 benzeen alcohol <800 Behuizing A
TGS800 20.34 Algemene lucht verontreiniging <700 Behuizing B Oranje

Wat kunnen deze sensors ruiken?
Alle waardes in ppm MQ2MQ3MQ5MQ7MQ8MQ9MQ135
LPG200-5000 200-5000 500-10000
CH4 methaan5000-20000 5000-20000 500-10000
C3H8 propaan200-5000 200-5000
C4H10 butaan300-5000 300-5000
C2H6O ethanol (alcohol)100-20000,05-10mg/L100-2000 10-300
H2 waterstof300-5000 300-5000 100-10000
CO koolmonoxide 20-2000 20-2000
RookX  
Benzine beperkt
NH3 10-300
Benzeen 10-1000

$val ){ $$key = stripslashes( $val ); } $jaar = substr($changeddate,0,4); $maand = substr($changeddate,5,2); $dag = substr($changeddate,8,2); $lastupdate = ("$jaar $maand $dag"); $prtsrttxt = get_txt($con1, 26, 1, $idsrtodd); $jaar = substr($createddate,0,4); $maand = substr($createddate,5,2); $dag = substr($createddate,8,2); $create_stamp = ("$dag $maand $jaar"); //GENERAL INFO FOR EVERY USER ************************************************** echo ("

"); echo (""); if ($codetext) { //Code like KY-026 or NA-41 echo (""); } //End of if ($codetext) $tmp = get_txt($con1, 9, $koekje[2], 3741); //Fieldname at screen if ($prijseurinclbtw > 0){ //Show price indication $prijs_formatted = number_format($prijseurinclbtw / 100, 2, ',', '.'); echo (""); echo (""); } //End of if ($prijseurinclbtw > 0) if ($sketchtext) { //Link to OWN SOFTWARE $tmp = get_txt($con1, 9, $koekje[2], 3738); //Fieldname at screen echo (""); } //End of if ($sketchtext) $tmp = get_txt($con1, 9, $koekje[2], 3744); //Fieldname at screen if ($pinouttext) { //Pinout echo (""); } $tmp = get_txt($con1, 9, 1, 3735); //Fieldname at screen $tmp2 = get_txt($con1, 26, 1, $row4[16]); //Group name in its language echo (""); if ($koekje[0]>0 and $koekje[3]>0){ //User is logged in and translates $tmp = get_txt($con1, 9, $koekje[2], 3918); //Fieldname at screen LANGUAGE if ($row4[26] == 1) {$imgname = "nederland.png";} if ($row4[26] == 2) {$imgname = "deutschland.png";} if ($row4[26] == 3) {$imgname = "uk.png";} if ($row4[26] == 4) {$imgname = "france.png";} echo (""); $tmp = get_txt($con1, 9, $row4[27], 3919); //Fieldname at screen $statuskey = get_status_key($con1, $status); $tmp2 = get_txt($con1, 61, $koekje[2], $statuskey); //Fieldname at screen echo (""); } $tmp = get_txt($con1, 9, 1, 3966); //Fieldname at screen echo (""); echo ("
"); //Header $tmp = get_txt($con1, 9, $koekje[2], 3923); //Fieldname at screen if ($koekje[3]=="1") { //If this user wants to translate then echo ("$tmp"); //If desired }else{ echo ("$tmp"); } //Else just show if no need to translate if ($koekje[0]>0 and $koekje[3]>0){ //User is logged in and translates echo (" (edit)"); } echo ("Algemene informatie test
"); $tmp = get_txt($con1, 9, $koekje[2], 3739); //Fieldname at screen if ($koekje[3]=="1") { //If this user wants to translate then echo ("$tmp"); //Class for colour }else{ //So you are not allowed to translate echo $tmp; //Show screenname of this field in user language } //End of If you want to translate this fieldname at screen echo (" "); if ($codelink) { echo ("$codetext"); }else{ echo ("$codetext"); } //End of if ($pinoutlink) echo ("
$tmp  "); if ($urlprijs){ echo ("€  $prijs_formatted"); }else{ echo ("€  $prijs_formatted"); } //End of if ($urlprijs > "") echo ("
$tmp  "); if ($sketchlink) { echo ("$sketchtext"); }else{ echo ("$sketchtext"); } //End of if ($sketchlink) echo ("
$tmp  "); if ($pinoutlink) { echo ("$pinouttext"); }else{ echo ("$pinouttext"); } //End of if ($pinoutlink) echo ("
$tmp  "); //MENU GROUP echo (""); echo ("$tmp2
$tmp"); echo ("flag.gif"); echo ("
$tmp  "); //STATUS echo ("$status $tmp2
$tmp  "); //LAST CHANGED $tmp = substr($changeddate, 0, 10); echo ("$tmp

"); return; //////////////////////////////////////////////////////////////////////////////// function get_status_key($con, $num){ $qry = ("SELECT id FROM status WHERE nr = $num ;"); $result = pg_query($con, $qry); $row = pg_fetch_array($result); return ("$row[0]"); } 0 AND software.rstid = 2 AND tblsystext.lanid = $koekje[2] AND tblsystext.txlid = 19 ORDER BY sftname ASC , controller ASC ;"); $result = pg_query($con1, $qry2); if (pg_num_rows($result)>0) { //Only if at least 1 program exists echo ('

'); echo (""); while($col = pg_fetch_array($result)){ $col[0] = ("$col[0]"); echo (""); echo (""); echo (""); if ($koekje[0] > 0 and $koekje[3]>0){ //User is logged in and translates echo (""); } echo (''); } echo ('
"); //Header $tmp = get_txt($con1, 9, $koekje[2], 3922); //Fieldname at screen if ($koekje[3]=="1") { //If this user wants to translate then echo ("$tmp"); //If desired }else{ echo ("$tmp"); } //Else just show if no need to translate echo ("
$col[2]  $col[0]"); echo ("(Edit)
'); } ?> 0){ if ($header == 0) { echo ("

"); echo (""); $header++; } //End of if ($header == 0) echo (""); echo (""); } } if ($header > 0){ echo ("
"); //Header $tmp = get_txt($con1, 9, $koekje[2], 3879); //Fieldname at screen if ($koekje[3]=="1") { //If this user wants to translate then echo ("$tmp"); //If desired }else{ echo ("$tmp"); } //Else just show if no need to translate echo ("
$colbpp[2]"); //Show software van deze bot $qry=("SELECT software_basedir FROM farmbotversie WHERE id = $colbpp[0];"); $result = pg_query($con1, $qry); $col = pg_fetch_array ($result ,0); $dir1 = "/var/www/html/robotigs/software/$col[0]"; $arr1 = glob($dir1, GLOB_ONLYDIR); if (isset($arr1[0])){ $folder = $arr1[0]; $countertmp = 0; echo ("
    "); foreach (scandir($folder, 1) as $filename) { if ($filename<>"." AND $filename <>".."){ if ($countertmp == 0){ $countertmp++; } //End of if ($countertmp == 0) $tmp = "/"; $dir = substr($folder, 14) ."/"; $link = $tmp .$dir .$filename; $showname = substr($filename, 0 ,-4); echo ("
  • "); echo "$showname"; echo ("
    • "); } //End of if ($filename<>"." AND $filename <>".."){ } //End of foreach (scandir($folder, 1) as $filename) echo ("
      "); } //End of if (isset($arr1[0])) echo ("
"); } ?>
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