KK2.1 Board

And this is the unboxing of the second in the row parcel with items! The box compared to the previous one is a little bit longer and taller. But is extremely light. I know exactly what it carries but even like that I was a little bit suspicious if everything is here or not!

Once like before, since you open the boxes the first think you visualize are padding materials and nothing more! This company has a great … for air pillows. I don’t think that they offer better protection compared to bubble plastic “blankets”. But it feels the empty space quicker. Maybe this is the answer of why they are using it so extensively.

At the bottom of the box the items I was waiting for something like 3 weeks! The first propellers are here. The second ESC, the programming card and the flight controller. The mighty KK2.1 board!

I took the props out of the box first. They are enormous in size but the characteristics are just fine for my tricopter. Every plastic bag contains two props with a 1045 size. This is translated to 10inch diameter and 4.5inch pitch. The diameter is an easy to understand figure but the pitch is a little bit trickier. So, 4.5inch pitch means that in normal conditions the prop will travel forward 4.5inches per every revolution of the propeller.

I need three props for the tricopter (that’s what the word means) but I’ve order two bags of two making a total of four props. This is not for just to be safe (and not wait so much for the next delivery from abroad) in case of a crash – that for sure is going to happen. The first bag contains CW props and the second CCW.

CW is translated to Clockwise and CCW to Counter Clockwise! If all of your propellers are from the one type then your tricopter will spin in the yaw axes without return (except if you are continuously using your tail servo in a strange shaft bank)!

Oh, and before I go to the next item I should say that they are Multistar brand. I don’t know if this is good or bad but the description sell this item to me! It was saying that they need almost no balancing and they had a greater stiffness compared to others. On top of that, the price was a little bit greater compared to others and I thought that I would give them a try! I never touch something like this before and I can give you a first about them!

The other good add on of those Multistar props is that they hold the locking nut perfectly. Here I am testing an M4 one from the previous order.

And this is the second Turnigy ESC. I have to get and a third one if I want my tricopter to take of someday. I scheduled this to go on one of the following orders not so far way from this date I am writing those words.

ESC’s are controlling speed by turning on and off their output Mosfets in a variable speed. But they are not just that. On board they hold a microcontroller with special firmware that can perform multiple speed-oriented operations. For example you can program them to start slowly or immediately. To brake when you put your throttle to zero, to informed them about the battery you are using and so much more.

This programming can happened through your radio transmitter but it takes time and is not suggested to a newbie like me. Instead you can use on of the programming cards I am showing in the above (and following) pictures. It’s again from Turnigy, just like the ESC’s, and it cost close to nothing.

It’s made of plastic, a good quality one, and is light. A little bit bigger that a normal credit card and is operational via four push buttons. You don’t need to put a battery to power this think. It takes its energy from the ESC (via the battery that is connected to it) or from an external BEC. This stands for Battery Elimination Circuit.

And now it’s time for the “diva” of this unboxing! The flight controller! The KK2.1 board! Ok, this version is the KK2.1.5 but is almost the same like the original one! Just a revision better! At least I hope to be better! Again I am going to use something like this for the first time. But after so many YouTube videos and tutorials on the net, I know exactly how to operate and what to do to get the best results out of it!

It comes in foam like black box and this is enclosed in a plastic bag. You will get a little piezo buzzer as well. Simple and… cheap! But you get what are you paying for! Despite the looks and the cheapness of the first sight, the capabilities of this little board are awesome! Plus, you get a patent pending sticker on top! Really! Patent Pending hexTronik!

If you cut the packing tape on top (this is the only think that holds the lid on top) the actual KK board will unveiled to your eyes! Regular green PCB (yes this is the cheapest one from the manufacturing perspective), an MPU6050 sensor and lots of servo connections from both sides of the flight controller!

And if you ask what a flight controller will do in a tricopter or a multicopter in general? It acts as a translator somehow! For example you want your multicopter to move forward. You will move the stick first and this command will travel via air to the receiver and will outputted to one of the inputs of the KK board. Then the flight controller will speed up or slow down the motors accordingly in order to execute your command. It will recognize what it’d doing and it position by reading the values of the MPU6050 sensor. In a closed look control, all of your commands will translated from stick position to movements by taking in consideration the sensor values! I can explain it more extensively for anyone that wants it together with code and everything but this is not part of this post.

The soldering residues on the bottom side of the board identifying hands soldering (a common method for pinheaders like those especially from China). They don’t bother to clean it but as I told before you get what you pay for. But it’s not a problem at all! You can leave it like that or clean it with a bit of alcohol.

You can use a 5V power source to power the board. The first screen (no no… it’s the second one as the first one is the software/hardware version that flashes for 2 seconds) is like the one I am showing above.

The SAFE means that nothing is triggered. A good feature when everything is connected, including motors and propellers. You can cut your skin if you are not paying attention when you playing with “toys” like multicopters.

By the way! This foam box is great for placing the KK2.1.5 board on top to my tricopter. I saw this in some pictures circulating the Internet but then I thought that there are better ideas to do that. Instead, the material that is made of makes a wonderful dampening system that will protect the sensor from false data readings.


Next: LiPos


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