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The Philippine Electronics and Technology Forum > Mixed Systems and Specialization > Mechatronics and Robotics (Moderators: edaph, marcelino) > line follower mobot
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paranz
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« Reply #20 on: July 18, 2008, 11:12:32 PM »
Since there are 3 IR transmitter/sensor pairs, we need to use 3 op-amps, 1 for each pair.

The most practical is to use an LM324 chip, it has 4 op-amps in a 14-pin DIP package. This is a common chip, available in your local electronics store.

Here is the pinout:
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« Reply #20 on: July 18, 2008, 11:12:32 PM »
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paranz
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« Reply #21 on: July 18, 2008, 11:24:12 PM »
Correction to the Figure in Reply # 19"

VR3 = (3.8V + 1.5V) / 2 = 2.65V

 Cheesy
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paranz
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« Reply #22 on: July 18, 2008, 11:52:56 PM »
Here is the complete sensor circuit




LEFT, MIDDLE, and RIGHT output pins can now be connected to the MCU input pins. You will need 3 MCU input pins.


If you have junk opto-mechanical mouse as your source for the IR transmitter/sensor, then you can build this sensor circuit for less than P50.  Wink
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Cute_Worm_1983
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« Reply #23 on: July 19, 2008, 01:48:20 AM »


Planning to build line follower just for fun.  Grin

Any idea or tip about the sensor ?

http://e-gizmo.com/ARTICLES/VBW77/VBPW77.HTM
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« Reply #24 on: July 19, 2008, 08:25:05 AM »
wow sir completo.. thanks po tlga.. gagawin ko na ung sensor..
parang drim come tru.. ehehehe
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paranz
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« Reply #25 on: July 19, 2008, 11:41:15 AM »
Quote from: daniel_ace07 on July 19, 2008, 08:25:05 AM
wow sir completo.. thanks po tlga.. gagawin ko na ung sensor..
parang drim come tru.. ehehehe

your welcome.

Post mo naman mga pics pagnabuo mo na  Wink
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Lenjei
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« Reply #26 on: July 19, 2008, 12:33:50 PM »
Quote from: daniel_ace07 on July 18, 2008, 06:22:13 PM
cge na po help us... hehe

ay sorry po.. nag logout na kasi ko yesterday..  Embarrassed
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paranz
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« Reply #27 on: July 19, 2008, 08:40:00 PM »
Quote from: bulate1983 on July 19, 2008, 01:48:20 AM


Planning to build line follower just for fun.  Grin

Any idea or tip about the sensor ?

http://e-gizmo.com/ARTICLES/VBW77/VBPW77.HTM


may kamahalan din kasi ang sensor na ito.

Mas ok pa rin ang IR sensor kasi hindi masyado apektado sa ambient light. Tapos flat ang package nito kaya madaling idikit sa ilalim ng RC car. Mighty bond lang ang gamit or glue ok na
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paranz
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« Reply #28 on: July 19, 2008, 09:21:51 PM »

ito ang IR LED and IR sensor sa ilalim ng toy car..





0.5 inch ang separation distance between pairs
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Cute_Worm_1983
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« Reply #29 on: July 20, 2008, 12:38:16 PM »

hehe optical mouse lang pala ok na! thanks sir paranz. 
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« Reply #30 on: July 20, 2008, 03:12:53 PM »
sir eto po ung sensor ko sa hehe nilagay ko po sa bumper ng kotse2x ko at try ko muna sa LED's kng gumagana po... hehehe comments po sir... hehehe pxenxa na po kng nakatagilid... hehehe









sir may tanung po ako about dun sa h-brigde ng motor anung transistor ang ok na gagamitin ko? atska po panu po icontrol ang speed ng motor? hehehe tnx po...
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« Reply #31 on: July 20, 2008, 03:26:09 PM »
ang galing kita sa camera mo yung liwanag ng IR led
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E153C51513
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« Reply #32 on: July 20, 2008, 03:28:55 PM »
Quote from: paranz on July 18, 2008, 11:52:56 PM
Here is the complete sensor circuit




LEFT, MIDDLE, and RIGHT output pins can now be connected to the MCU input pins. You will need 3 MCU input pins.


If you have junk opto-mechanical mouse as your source for the IR transmitter/sensor, then you can build this sensor circuit for less than P50.  Wink

expresspcb? Cheesy
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« Reply #33 on: July 20, 2008, 03:33:06 PM »
Quote from: nucleus on July 20, 2008, 03:26:09 PM
ang galing kita sa camera mo yung liwanag ng IR led

ou nga po eh... ngulat nga ako hehehe ktang kta ung IR hehehe
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Ate Shey
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« Reply #34 on: July 20, 2008, 03:39:30 PM »
sensitive kasi sa infrared ang mga webcams.. by the way you can also use "prepackaged" reflective object sensors from Optek available in RS, Farnell, try niyo din magtanong sa E-Gizmo kung available sa kanila.. magkasama na kasi yung phototransistor at light emitter in one package..

OPB706A


OPB745
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rdpzycho
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« Reply #35 on: July 20, 2008, 04:39:31 PM »
OT: meron din bang distance sensing ang optek? hindi ko maalala sino manufacturer nung distance sensing na balak kong gamitin dati, pero parang ganyan din ang package.
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« Reply #36 on: July 20, 2008, 04:58:38 PM »
kung 2 motor 3 wheeled mobot pwedeng walang uC no? Cheesy
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« Reply #37 on: July 20, 2008, 05:04:05 PM »
Quote from: rdpzycho on July 20, 2008, 04:39:31 PM
OT: meron din bang distance sensing ang optek? hindi ko maalala sino manufacturer nung distance sensing na balak kong gamitin dati, pero parang ganyan din ang package.

i am not sure kung meron ang Optek but I think meron ang Vishay ng long range photoreflective switch..
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« Reply #38 on: July 20, 2008, 05:07:48 PM »
yung nakita ko kasi dati analog ang output. sharp ata or hitachi, hindi ko na maalala. gagamitin ko sana para sa sensing ng layo ng material sa mill para makapag-adjust yung head. pero hindi na natuloy yung project kaya nakalimutan ko na. Grin

@nucleus: yup pwedeng walang MCU. unang mobot ko puro logic gates lang, hindi line following kundi pag bumangga iikot lang. na-corny-han nga ako nung natapos na. Grin ang maganda lang sa may MCU pwede mong i-optimize yung pag-follow sa line para mabilis matapos ang track.
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« Reply #39 on: July 20, 2008, 05:13:47 PM »
logic gates? hehehehe di ba op amp lang

yung naiisip ko ganito
dalawa yung motor sa likod sa bawat motor isang gulong na tapos yung nasa harap permanent lang  na gulong di naliliko bale ang magpapaliko sa kanya pag nag iba ang direction nung isang motor Cheesy
kung ganun isang lm324 na lang at mga transistors resitors caps na lang ang kailangan Cheesy okay ba yun?
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