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Author Topic: transistor switch logic . very hard to solve this scenario.  (Read 4191 times)
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the darlington has no resistor in the base?
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Nope, just follow the link I gave you, to wire it.
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isabela, philippines.
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the darlington has no resistor in the base?
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Nope, just follow the link I gave you, to wire it.

i will try this thing.

i will also try the relay style of the others suggested solution
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jaylisto

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I don't think you connected the grounds, Dave.
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You need to use two relays, one DPDT to determine forward/reverse and a one SPST to to perform the stop/go command, this second relay's contacts is simply wired in series with the positive voltage coming from the motor battery.
Or, if you want speed control and have an appropriate transistor, you use that in place of the single-pole relay, and just use the DPDT for reverse.
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You need to use two relays, one DPDT to determine forward/reverse and a one SPST to to perform the stop/go command, this second relay's contacts is simply wired in series with the positive voltage coming from the motor battery.
Or, if you want speed control and have an appropriate transistor, you use that in place of the single-pole relay, and just use the DPDT for reverse.

o! my friend will travel to manila, i will give her a favor to buy what i need.

some one say here that their is an hbrige built in an i.c? what exactly the name of the ic?

that has the capability of giving what i want. pls suggest what is that hbridge ic. to be sure do not suggest rare ones. thank you so much. im looking forward for your reply.
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The two most common are SN754410 and L293D
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The two most common are SN754410 and L293D

what is the difference between the two?

i search it and sn754410 looks like it only uses 1 motor.

and l293d can handle 2 motors.

so what do you prefer? note: i only have 3v for trigger, and 7v for the higher voltage.
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The SN754410 can handle two motors @ 1Amp, the L293d I think can handle 2-3 Amps.
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The SN754410 can handle two motors @ 1Amp, the L293d I think can handle 2-3 Amps.

thank you very much. i think ill take l293d.
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The SN754410 can handle two motors @ 1Amp, the L293d I think can handle 2-3 Amps.

now i have two L293D chip.

can some one gives me the diagram on it pls?

note, my battery is 6v 4ah sla battery.
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I don't think you connected the grounds, Dave.
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Doesn't one of the motor shields use the L293?
There should be a schematic over at the Main Site
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Doesn't one of the motor shields use the L293?
There should be a schematic over at the Main Site

i dont know, i cant understand the diagrams i searched.

check out what ive done. can this thing work? since my hbridge is expensive and very hard to find availablitiy , i dont want to mess it up.
 

any corrections?.
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That's correct, but you can increase the actuall Vcc voltage to 5 - 12V. Keep the enable at 5V thou. That chip can also do PWM.
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I don't think you connected the grounds, Dave.
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http://arduino.cc/en/uploads/Main/arduino_MotorShield_Rev3-schematic.pdf

You can ignore the current-sense amplifier.
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thanks for all help. the hbridge chip is now working.

this maybe an out of topic question. pls answer


i have a 12v battery source. the regulator is in parallel. the 7809 suppose to regulate 9v. and the 7805 is 5v.

when i test them. the 7809 output has only 6v and the other is only 3v. why did this happen?




do i need to get them in series?
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jaylisto

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Not enought current maybe. If you take one of them off, does it output the correct voltage?
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