Quadcopter Successful step

Couple of months ago, I tried to build a mini quadcopter with small motors (7mm coreless motor)

I got those motors from Amazon and they just fit my needs to build a mini quadcopter.

I also found this motor on eBay that worth $5 for the four motors. But without the propellers.

I built the frame from wooden sticks and attached the motors to them.

I couldn't wait to make the quadcopter control and wanted to try to fly it directly using the battery without any control.

Of course, this is not a real trial to fly the quadcopter.

Since there is no meaning to fly the quadcopter without motor control.

But I was so excited that I wanted to see it lifted even without control.

The control circuit plays an important role for the quadcopter.

It controls each motor using PWM Pulse Width Modulation signals.

And it keeps the quadcopter leveled - or even tilted - depending on position information from the sensors (accelerometer and gyroscope).

The control circuit processes signals from sensors and then controls each motor accordingly using PWM.

First, I've decided to build it using Arduino Uno but then I found that Arduino Mini would be more convenient since it weights less.

I wanted to make this trial just to get this quadcopter flying quickly.

First, I connected all the motors in parallel with the Li-Po Lithium Polymer 3.7v battery.

Unfortunately, the quadcopter haven't been lifted even small centimeters of the ground while the motors were running at  full thrust.

Then, I connected a 12v DC power source with wires.

I thought of this a tethered quadcopter.

But also, the motors rotated and quadcopter didn't fly.

I was a little bit disappointed since I thought it would even step up of the ground.

My wife suggested that I connect the motors in series.

I thought it would be a good idea. Although the voltage for each motor will be the quarter of the total applied voltage. 12 volts / 4 motors = 3 volts for each motor.

But the current will be the same for each motor and is equal to the total current from the power supply.

This means larger current than the first trial (parallel connection) in which current was divided by four.

That is how I thought the results would be different from the first one. So I decided to try it.

And guess what happened !!! The motors rotated faster and the quadcopter was showing larger resistance to the gravity and lifted of the ground.

Now, I've learned three lessons from this trial before finishing the final quadcopter project:

The first lesson is psychological and sociological one.

I've learned that things may not run as you think it would from the first time.
You must NOT declare failure from the first trial.
Failure is not actually declared unless you declare it.

The other two lessons are technical:

- These motors need higher current to uplift the quadcopter not higher voltage.  
- The control circuit not only working on quadcopter stability, but also in this mini quadcopter plays the role of motor driver by giving them the proper current and voltage for rotation.

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