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ajak
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« on: September 28, 2008, 10:17:03 PM » |
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Panu ba simulan to?
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« on: September 28, 2008, 10:17:03 PM » |
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ajak
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« Reply #1 on: September 28, 2008, 10:19:13 PM » |
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Anong maganda Ultrasonic o Infrared?
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Ate Shey
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« Reply #2 on: September 28, 2008, 10:56:07 PM » |
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Anong maganda Ultrasonic o Infrared?
for short distances, ultrasonic.. bili ka sa alexan ng MA40LIS (sender) at MA40LIR (receiver) na piezoelectric transducer.. basically, mag-gegenerate ka ng 40 Khz na signal then send it using the MA40LIS tapos orasan mo kung ilang microseconds or milliseconds bumalik yung signal.. Distance (meters) = Velocity of sound in air (meters/seconds) X time (seconds) divide by 2 mo yung distance para makuha mo yung exact distance ng obstacle since twice yung distance na ita-travel ng sound.. first ---> from MA40LIS to obstacle second ---> from obstacle to MA40LIR |
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mArKhAo
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« Reply #3 on: October 17, 2008, 02:34:28 AM » |
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e, anu po ang mahal sa kanilang dalawa?  |
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« Reply #4 on: October 17, 2008, 08:25:47 AM » |
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I guess mas mahal ang ultrasonic ska mas complicated ang circuitry but yet mas accurate at mas malayo range up to around 6 meters.
IR medyo short range lalo na kung reflected ang paguusapan.
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« Reply #5 on: October 17, 2008, 11:39:08 AM » |
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anu po ang mas maganda qng maze mobot ang gagawin |
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« Reply #6 on: October 17, 2008, 11:58:55 AM » |
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anu po ang mas maganda qng maze mobot ang gagawin I think kung maze di mo na kailangan ng long range then mahirap gumamit ng ultrasonic ksi bka mag bounce thru lang sya kya maguguluhan un sensor sa echo. Go to optical one. |
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underprezzure
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« Reply #7 on: October 17, 2008, 12:07:56 PM » |
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I guess mas mahal ang ultrasonic ska mas complicated ang circuitry but yet mas accurate at mas malayo range up to around 6 meters.
IR medyo short range lalo na kung reflected ang paguusapan.
The ultrasonic pair from alexan is Php300+. The circuit is more complex than IR but not that complicated. For IR, I was able to make use of the Alexan IR pair and transmit data over 10 meters. -underpazz campaigns for more technical post on technical threads -underpazz campaigns for " no hijack policy" on technical sections |
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« Reply #8 on: November 14, 2008, 10:26:29 PM » |
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@underpazz ok kaya ito? nagamit q na ito, but, mga 3/4 feet ang max nya.. without lens...  pwede kaya ito substitute for ultrasonic? ang mahal kasi e...  |
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underprezzure
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« Reply #9 on: November 14, 2008, 10:34:05 PM » |
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^puwede. Kaya lang kalaban niyan ay yong obstacle na maninipis.. tulad ng daliri mo na tinurok sa harapan ng IR mo, hindi yan madedetect... hehehehehe... manipis lang kasi ang beam niyan eh unlike sa Ultrasonic TX mas malapad yon... at isa pa prone pa rin yan sa ambient light...
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« Reply #10 on: November 14, 2008, 10:38:21 PM » |
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ang ultra sonic po ba, ung reciever nya, malapad din ung area? |
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« Reply #11 on: November 14, 2008, 10:42:37 PM » |
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eto naman ung receiver ng IR ko..  tapos ito pa ung isa pang uri ng Ir... 3mm naman xa... ung katabi, phototransistor(black)....  |
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« Reply #12 on: November 14, 2008, 10:43:18 PM » |
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ang ultra sonic po ba, ung reciever nya, malapad din ung area? Actually ang minemeasure jan ay ang Angle of Wave propagation ng Transmitter at hindi ang receiver. Simple analysis... Tx angle of progration = 45 o Rx angle detection = 10 oIbig sabihin 45 o >> 10 o kaya kahit liitan mo pa ang RX angle detection basta wag lang zero ay makakadetect pa rin ito ng 45 propagated wave.  -underpazz campaigns for more technical post on technical threads -underpazz campaigns for " no hijack policy" on technical sections |
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« Reply #13 on: November 14, 2008, 10:46:03 PM » |
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i mean, ung area nung circle na tatama sa surface.. hehe churi. |
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« Reply #14 on: November 18, 2008, 11:27:02 PM » |
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The ultrasonic pair from alexan is Php300+.
-underpazz campaigns for more technical post on technical threads
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yung ultrasonic ng alexan, katulad din po ba yun ng ultrasonic ng e-gizmo? bat ang mahal dun sa e-gizmo? |
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« Reply #15 on: November 19, 2008, 04:09:05 AM » |
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yung ultrasonic ng alexan, katulad din po ba yun ng ultrasonic ng e-gizmo? bat ang mahal dun sa e-gizmo?
may Zilog MCU ung sa egizmo kya mahal. Pwede ksi ito magsend ng data regarding sa distance ng object. |
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« Reply #16 on: November 21, 2008, 07:14:20 PM » |
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^ah.. ganun po ba? meron na po kami nung sa e-gizmo.. kala ko kasi pareho lang sila ng sa alexan.. may site po ba ang alexan?sa gizmo lang po kasi kami bumibili ng gamit.. eh kaya lang minsan wala din silang stock..
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« Reply #17 on: November 21, 2008, 08:49:13 PM » |
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@underpazz ok kaya ito? nagamit q na ito, but, mga 3/4 feet ang max nya.. without lens... pwede kaya ito substitute for ultrasonic? ang mahal kasi e... pre. pwede na siguro yan.. kung gagamitin mo sa maze, ok na yan.. makapal naman yung mga walls dun e.. |
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underprezzure
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« Reply #18 on: November 21, 2008, 10:19:57 PM » |
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Sa obstacle avoidance these are just some of the things to consider.
1. Environment. Possible interferrences to overcome like ambient light, perimeter objects na maninipis o makakapal.
2. Distance. Gaano ba kalapit o kalayo ang dapat na detection distance from the obstacle relative to the mobile robot.
3. Mobile objects. May ibang mobile robot ba na makikisawsaw sa isang subject environment.
4. In line with number 3 is peer signal interferrences. Baka yung kalapit na mobile robot ay kapareho ang method or application set up, baka magkandaloko-loko ang takbo ng bot across the perimeter.
5. Surface. Ang gugulungan ba ng bot mo ay lubak-lubak (uneven/rough plain), sobrang uga ng bot baka ang nadetect niya ay ang ground/lupa na mismo..
6. Angular detection and object angle relative to the lupa. In line sa number 5 ito. dapat wag masyadong malapit sa ground ang transmitter mo baka kasi ang angular wave propagation ay sumasagad na sa lupa or malapit na sa lupa at kunting uga na lang ay tatama na ito sa lupa...
7.atbp.
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« Reply #19 on: November 21, 2008, 10:22:11 PM » |
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sinagut mo din.. the best ka. ganda points..  salamat bosing @wan sisimulan ko na din ito hehe... (puro simula) |
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July 26, 2009, 04:42:16 AM
