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1  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 19, 2013, 08:17:19 pm
Right now I'm running one motor. If one works then all do. When I get this one working (which I did before and now it stopped) I will use an appropriate battery. The problem right now is -- not what battery etc. -- it's the arduino. What is wrong with it?
2  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 19, 2013, 11:54:37 am
Nothing changed from my previous "schematic". I changed my heli motor to the regular motor provided in the kit and it's still not working.
I used my multimeter to check the voltage and it didn't give me a clear reading even though I for sure attached it correctly.
In case you don't know, I'm using the shield for my BOE-bot on top of my arduino so it should be the same.
On the shield, it has many more 5V and gnd pins by the breadboard area, besides for the main 5V and gnd pin. Even those other pins didn't give me a steady reading.
When I did all of that, the Arduino was plugged into the computer and the led on pin 13 was lit.
The problem must be either the shield is not plugged in properly for some reason, or, I damaged the Arduino (hopefully not smiley-sad smiley-cry), or something else.
Again, pin 6 is connected to 330 ohm resistor to the appropriate pin of transistor. A 2nd pin of transistor is connected to the common gnd and the 3rd to the gnd of the motor. The positive side of the motor is connected to 5V.
What's wrong? Thanks.
3  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 19, 2013, 09:58:25 am
I plan on controlling it via a battery (probably 9V) but for now I'm only trying to drive one as a test.
I am controlling it when the rotor is attached -- I never took that off.
I could not find ESCs or any specs for anything online except for 4 semiconductors at http://pdf1.alldatasheet.com/datasheet-pdf/view/85382/FAIRCHILD/FDD8896.html The helicopter is called S022.
I used to be able to control it just fine and it would go fast! I'm using a transistor to control it.
It was all going well until recently it stopped working. I didn't burn it out because the resistance of the motors were normal. The problem is that I can't get any voltage out of the 5V or gnd pins. How do I fix that and why is that so?
4  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 18, 2013, 07:36:57 pm
Things don't seem to be working anymore.
Both motors won't run.
I checked the resistance of the motors and that's normal. But when I tried measuring the voltage of the 5V and gnd pins, I couldn't get any reading out of them! I don't know what to do. Something wrong with it? Is it my meter or is it the arduino? Is it the shield that's on the arduino? Help please.
5  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 14, 2013, 09:26:56 am
I'm going to try hooking up my 9V battery to the motors.
If 4 motors are running on a 7.4V battery, then on max speed, each motor is getting 1.85V.
If none stop, then each motor is getting 1.85V.
If one stops, then 2.46V are going to each of the other motors, giving them a boost.
If two stop, then the other two have a major advantage, 3.7V each.
If three stop, then remaining motor has a full 7.4V!
Problem 1) The motors are never running full throttle which doesn't make sense
Problem 2) Programming with quadcopters/helicopters gets hard because when you try to balance it by giving a slightly less Voltage, the other motors go stronger and unbalance it [so I'd have to distribute the voltage programmatically so no undesired effects happen.]
Is that semiconductor I found fixing that?
6  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 13, 2013, 11:17:06 am
Last night I managed to get it to go alright.
However, the motor won't budge until you give the gear a small push to start moving. The reason why that's so is because that small bit of friction it makes gives a little more power to the motor, and because that helps the motor overcome the torque and inertia.
Doing that only starts working when the pwm is set to 45-255.
As a side point, the transistor gets slightly hot when I run the program (especially when I try to do two motors from the same transistor).
When I tried doing 2 motors at a time, it seems like they split the current between the two so they were going very slow.
The motors have not heated up at all so maybe it's not anywhere near it's max current so I can get a better battery?
7  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 12, 2013, 08:28:34 pm
A schematic of what?
I tried following the lines on the circuit board but there's no lines to follow.
Do you want a schematic of the breadboard circuit I made?
My father knows all about current, circuits, resistors, voltage, transistors, semiconductors etc. (mechanical engineer) so he's telling me about voltage dividers and how to make one.
See attachment for schematic of my circuit.
8  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 12, 2013, 06:10:41 pm
I found 4 of these things on my circuit board of the helicopter. By the letters and numbers on it, I found the product online:
http://pdf1.alldatasheet.com/datasheet-pdf/view/85382/FAIRCHILD/FDD8896.html
So it's a semiconductor resistor (I believe).
So what does all of that data mean? Am I able to use my 40V 200 milliamp resistor? The semiconductor's datasheet says 30V 94A 5.7 milliohms.
There are normal yet strange results when I make my motor spin but it's hard to explain:
1) Doesn't seem like I can set the speed.
2) When I tried a for loop for speeding up and down, it didn't work.
3) When I press reset when the motor is spinning to restart, the motor just goes faster (I assume it's a build up of power in the resistor)
4) Sometimes, the motor just makes a very quiet noise as if there's voltage of some sort applied, but not enough to spin the motor
5) When that happens (not sure if this is always true), if I nudge the gear/propeller, the motor starts spinning.
What does this all mean? How can I fix it (without buying extra parts other than what's in my kit)?
Thanks.
9  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 12, 2013, 10:17:53 am
I'm not sure, but I got the canaKit for arduino (sparkfun inventor's kit) and am right now using the online manual for the motors on page 67 of the manual:
http://www.canakit.com/Media/Manuals/SIK-Manual.pdf
One problem is I'm missing my diode (for right now I can't find it).
Without the diode, the gear on my motor moves a drop, but it I think is too much torque to turn the bigger gear which turns the propeller.

Update: I connected the + and - pins from my 7.4V battery to the breadboard circuit. Pin #6 was connected to 330 Ohm resistor to the middle pin of the transistor. The 7.4 V were connected to the motor, and the ground of the motor was connected to the collector. The emitter was connected to ground of the battery. When I turned it on, the motor turned fast. I'm worried something will burn out if I apply to many amps or something.
10  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 11, 2013, 09:26:45 pm
Here's a better link:
http://www.rchelicoptershop.com/rc-helicopter-parts/toy-helicopter-parts/syma-s022-parts/syma-li-po-battery-for-s022-chinook.html
That's the battery I have. Any more info about it would be great.
11  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 11, 2013, 09:09:59 pm
For right now just get it to spin (to a desired speed).
The image at the following link looks like the one I'm using (but the words on the front look wrong and there the back on mine is the same on both sides).
12  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 11, 2013, 09:01:23 pm
7.4V battery that says:

7.4V
702540K
-031

Not sure what battery that is. It looks two cell.
13  Using Arduino / General Electronics / Re: Run motor from rc helicopter through Arduino on: August 11, 2013, 08:52:05 pm
I have a transistor. I also have a 9V battery ready to be connected to Vin.
What do I need to power my transistor and make it work?
14  Using Arduino / Sensors / Re: Swimming Pool Water Level Sensor on: August 11, 2013, 08:49:08 pm
Ping))) sensor:
http://www.parallax.com/tabid/768/productid/92/default.aspx
Very accurate down to the Centimeter up to 3.3 meters. ~$30
15  Using Arduino / General Electronics / Run motor from rc helicopter through Arduino on: August 11, 2013, 08:36:28 pm
Hi,
I just took apart my rc helicopter S022 (I lost the remote). Just for a start, I was trying to simply power the motor through Arduino.
The motor has no specs, so I don't know what resistor (if any) I should use because I don't want to burn out the motor.
The motor has just 2 wires - red and black. I connected the red to digital pin 6 and the black to ground.
But do I control the motor through analog or digital write? How do I control how many Volts are applied?
When I tried analogWrite(motorPin, 150) nothing happened except for something that sounded close to a quiet beep (like voltage was applied), but no motor movement.
What's wrong?
Thanks. Any help is appreciated.
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