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Author Topic: DC motor  (Read 5790 times)

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Offline dsesmgTopic starter

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Re: DC motor
« Reply #30 on: August 21, 2009, 07:24:25 PM »
Hi, thanks a lot.
I just tested with the circuit you proposed and it works great.
when I exposed the photo transistor to the sunlight, the motor spins.
Also, when i beam TV remote control light to the photo transistor, the motor spins a little.
I think it is because, the TV remote control doesn't beam the light continuosly even if I keep the button pressed.
I hope i could make a circuit for the infrared emitter and test with this photo transistor circuit.
As you know, the current emitter i have is this specification.
http://www.flickr.com/photos/34955071@N02/3825092211/sizes/o/
http://www.flickr.com/photos/34955071@N02/3825079541/sizes/o/
http://www.flickr.com/photos/34955071@N02/3825092215/sizes/o/
http://www.flickr.com/photos/34955071@N02/3825079427/sizes/o/
But, I have little knowledge about this.
I need to control this emitter by using some microcontroller signal.
Could you advise me how to wire up the emitter?
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Offline SmAsH

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Re: DC motor
« Reply #31 on: August 22, 2009, 01:54:50 AM »
wait, what do you want to control?
the current flow from the collector to emitter?
there you will put the base to a digital pin... am i getting you?
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #32 on: August 22, 2009, 02:02:31 AM »
Hi, James,
Yes, I need to control the current flowing from the collector to emitter so that I can control the on/off mode of the emitter.
Yes, I will put a digital pin to the base of the TIP102 so that the TIP102 transistor could act like a switch. :)
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #33 on: August 22, 2009, 02:05:55 AM »
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Offline SmAsH

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Re: DC motor
« Reply #34 on: August 22, 2009, 02:11:26 AM »
yeah, that will work...
just a word, you don't need the diode if you are controlling something like an led...
the diode is just to stop back emf from motors or other coils.
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #35 on: August 22, 2009, 02:20:06 AM »
Thanks a lot, James.
OK, I will take out the 1N4004.
I will test with this circuit and I will get back with the result. :)
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Offline SmAsH

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Re: DC motor
« Reply #36 on: August 22, 2009, 02:27:14 AM »
ok, your testing it with a microcontroller right?
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Offline Soeren

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Re: DC motor
« Reply #37 on: August 22, 2009, 09:02:11 PM »
Hi,

Quote from: SmAsH on August 22, 2009, 02:11:26 AM
yeah, that will work...
... If a LED with internal current limiting is used, yes, otherwise, just for a split second ;D
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Offline SmAsH

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Re: DC motor
« Reply #38 on: August 22, 2009, 09:05:36 PM »
why is that, because of no resistor?
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Offline Soeren

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Re: DC motor
« Reply #39 on: August 22, 2009, 09:24:14 PM »
Yes.
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Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #40 on: August 22, 2009, 10:18:52 PM »
Hi, yes,I am using it with a microcontroller.
then, how much ohm resistor do I need to use?
Because, I tested with the circuit after taking out 1N4004 from the circuit.
The emitter doesn't show any result.
So, I replaced the emitter with a normal LED. The LED blinked well so I brought it close to the transistor and the motor spinned very well.
I thought the emitter is broken or something.
Could you advise me how much ohm do I need to use and where should it be connected?

Also,the photo transistor only responded to red colored LED.
I have red,green, yellow LEDs and tested with them all.
Anyway, only the red colored LED is giving effect on the photo transistor.
« Last Edit: August 22, 2009, 10:20:10 PM by dsesmg »
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Offline SmAsH

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Re: DC motor
« Reply #41 on: August 22, 2009, 10:25:00 PM »
well, if you are giving the led 5v as your supply i would say something in the 150-250 ohm region would work well.
the resistor should just be placed in between the led +(anode) and your supply.

the reason it only reacts to certain leds is because of its operating wavelengths...
it will only turn on with wavelengths from a certain range. the leds that work must be in that range ;)
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #42 on: August 22, 2009, 11:03:45 PM »
Thanks a lot, James.
Then, I will test it with 150~250 ohm resistors.
I don't have them right now, so I will order them today.
By the way, I am trying to find better emitter and detector.
Below is the emitters.
* S13317-H
http://www.flickr.com/photos/34955071@N02/3847545598/sizes/o/
http://www.flickr.com/photos/34955071@N02/3846755227/sizes/o/
http://www.flickr.com/photos/34955071@N02/3846755305/sizes/o/

* EL-1CL3
http://www.eleparts.co.kr/epdf/SENSOR/EL-1CL3.pdf

And below is the detectors.
* SP-1CL3
http://www.eleparts.co.kr/epdf/SENSOR/SP-1CL3.pdf
* ST-1CL3H
http://www.eleparts.co.kr/epdf/SENSOR/ST-1CL3H.pdf

I am trying to choose one of those emitters and detectors.
I don't quite familiar with the specification of such sensors.
Could you advise me which emitter has the longest beaming distance and which detector is less sensitive to the visible light?

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Offline SmAsH

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Re: DC motor
« Reply #43 on: August 22, 2009, 11:25:14 PM »
dude! do you have enough programs open :P

well, you will want to look for a set that are in the same wavelength...
if you want them not to be too affected by visible light then go for a pair in the infrared spectrum...
i cant really give advice on those ones as i think i have a virus or something thats screwing with my adobe >:(
as far as range goes, try to go for a non-diffused emitter as it is generally brighter...

as for the resistors, they will need to change according to your emitters, use the following formula to choose
a resistor: supply_voltage-led_operating_voltage/led_operating_current_in_amps...
eg 5-2=3, 3/.02=150... resistor =150 ohms.
remember to recalculate accordingly...
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Offline dsesmgTopic starter

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Re: DC motor
« Reply #44 on: August 23, 2009, 02:35:59 AM »
Thank you, James.
It's very helpful.  :)
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