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Author Topic: 2 motor underwater drone using 2 6v dc motors- help Please  (Read 1891 times)
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i need some help designing a 2 motor underwater drone and i am using 2 dc motors for testing. i have various components especially for this project. i dont need you to do the work for me, just need some help from pros cause im new to this. Am i missing components? i want it to run on its own stand alone board and i want to turn the arduino into a Remote with a screen to see a camera that will be attached to the UWRCD.

Also links to Tutorials would be nice to. All im looking for is some good starter information.

the list is
 2; 6-9v dc motors
3; TIP120 Transistor
1; MCP3008- 10 bit ADC with SPI (not sure how to use but thought i would need inputs)
1; photocell
1; 0.5w 6v solar panel
1; LED controller
3; cd110 16v 47uF capacitors
1; shield board
10+; LEDs
4; push pin
2, tiny switch
2; single digit 7 seg display
tons of resistors
2; 3.7v 1400mAh LIR18500 Lithium Ion Batteries Wired to Be charged
1;Plastic water Soleniod Valve 12v-1/2"
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I don't think you connected the grounds, Dave.
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Do you want to be able to reverse the motors?
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i want then to change direction, yes
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I don't think you connected the grounds, Dave.
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Relay?
H-bridge?
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I have seen those but I am not familiar
Half the tutorials are not helpful.
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I don't think you connected the grounds, Dave.
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Read the other half then
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Is it like building a new arduino?
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Never mind the submarine parts for the moment.

Do you know how to write a sketch and connect up one motor so it can be controlled forwards and backwards with an Arduino?

If/when you can do that, move on to a pair of motors.

Take the project in small steps - just like professional programmers do.

...R
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Thanks for the advice. C:
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You might consider speed hacking an inexpensive servo for a drive motor. Below are previous ROV post in the forum.

http://www.hobbyking.com/hobbyking/store/__3743__HXT_6_9kg_39_2g_16sec_Twin_bearing_servo.html

https://www.google.com/search?as_q=rov&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=http%3A%2F%2Fforum.arduino.cc%2Findex&as_occt=any&safe=images&tbs=&as_filetype=&as_rights=


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I can't figure out how solar panels and so on would work under water so you might need to divide your project up into more sensible parts and solve each part separately. Have you worked out how powerful the motors need to be? If not, I suggest you do that at an early stage since a lot of the following design will depend on it. For example, you might need to run some practical experiments using plain old wired manually controlled motors/impellers to see what works for the vehicle you're planning.
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I'm still trying to figure out the motor issue. I'm new to arduino so I'm having more trouble than expected. I bought a motor shield from seeed and I'm not finding any tutorials. Not for 2 wire. So I been doing research and discovered 2 new motor types. Outrunner and inrunner. Saw some tips on water proofing but no actual knowledge on motors.

But the solar panels would work as an emergency power... I know how to manually charge batteries so no programming should be needed right away. perhaps I should show the sketch drawing I made for plans. Should be posted soon.
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The terms outrunner and inrunner are usually used in the context of brushless motors to describe the arrangement of the coils and magnets. If you're going to use brushless motors then of course this has a fundamental impact on your choice of motor drivers. You need to sort out which motors you will be using and what voltage and current they need to be supplied with before you can decide what to use to drive them.
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The last thing you did is where you should start looking.
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"Saw some tips on water proofing"
Maybe use 2 strong magnets for linkage.
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The way you have it in your schematic isn't the same as how you have it wired up!

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You might try looking at what these college students did for propulsión.

True, It's a raft, but the motors look adaptable.

http://marinerobotics.wordpress.com/category/rc-raft/

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Quiero una vida simple en Mexico...nada mas.

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