Lebanese OCTO Copter built by Mounir Zoorob

A few days ago, I bumped into Mounir Zoorob's OCTO copter project. It is a very impressive flying monster that Mounir designed entirely by himself. It is 1m in diameter and it has a 3 axis camera Gimbal, all designed from scratch. Apparently he has spent over 4 months very hard at work to finish it on time. I must say he did a pretty amazing job. So I invited Mounir on DepotBassam to write a small review of his OCTO copter flying machine, and here is his post:

Before starting, I would like to mention that the materials used are not the best choice. However, since there was nothing available in this part of the world and shipping carbon fiber parts was not possible I had to go with aluminum and Plexi glass instead. (on that subject, review DepotBassam's post on Lebanese electronics shops for more info)
I used 2cm * 2cm * 1 mm aluminum square tubes and the motors are from DIY drones with 35cm wires 2836/9. Each engine has a thrust of 1300g approximately.

I'm using Ardumega from DIY Drones as the main controller with magnetometer + sonar. So far it has proven to be the best thing I have ever bought for this hobby. i enjoyed it so much i bought it as a kit and soldered everything together

I designed and laser cut the case from a 3mm black plexiglass to hold both the Ardumega and the receiver.

As for the motor controllers, I bought 8 25AMP Turnigy ESC's from HobbyKing.
I am currently using 11*4.7 props but will go with the 12 later on down the road. All well balanced

Ardumega will be responsible for the compensation on the roll/pitch axis at the moment. Later on, I will upgrade it to control all three axis.

This is my camera gimbal. It currently has 2 active axis , but later on I will upgrade it to 3 axis. Currently I'm working on finalizing roll and pitch, but I am still waiting for the right parts to arrive.   

Wires were also taken into consideration during the design phase :) very neat :) 

Wires from the ESC's  to main power source are all well soldered and added heat shrink.

Here's the OCTO almost ready for a test flight :)

Here is the OCTO after couple of flights. I modified the design of the Gimbal and I integrated a new landing gear design on it

I promise the next design will be more elegant. With the cash at hand and the time this is the best I was able to come up with.

Here is a sample picture from the video I'm taking from the OCTO

Here is the first video from the OCTO, of course it looks better now but this is just a sample.

For those who love beer, here's one for you :) Note: I got rid of that beard

Feel free to ask me anything, your feedback is important to me. It better be a good one though!

Lebanese electronics shops: the TSOP experience.

As everybody working with electronics in Beirut would agree. We don't have a great accessibility for components and IC's. If I am dealing with non common components, I don't even bother looking around in the local electronics hardware shops that we have (Katranji, Incotel, Boujikian, Narinco, etc.) I wait till I gather a big list and I order my components from abroad (that is an extra 50-100$ added to the bill).

I will not talk about shipping in this post, however I will be talking about the wonderful experience one has to deal with in our lovely local electronics shops.

Starting with Boujikian, all I can provide you is a simple advice: if you have an Armenian friend, tag him along with you.

Now I would like to share a nice story. A few weeks ago I was building an IR remote control emitter/receiver circuit (I will provide info for the circuit in another post). So I needed to buy an IR receiver chip TSOP1738 that only works with carrier frequency of 38KHz. Perfect.

First thing: Check Katranji's website if they have the component. (+3points to katranji for having a website) However the website search engine sucks, so you have to look manually for the part (-1pt). After not finding the part on their website. You would grab your component name/number and head to Jneh in the middle of the traffic jam and heat. Once you get there, don't expect to be treated well. Sometimes don't expect to be treated at all. (-1pt). I was lucky enough to find a decent help, lets call him Nabil (hypothetical name for a hypothetical person)
-Bassam: Can I have the following component please.
Nabil stares at his monitor for 5 minutes only to tell me that they don't have it.
-Bassam: Do you have anything equivalent. TSOP18...21.. wlek 28... anything at all...
Nabil stares at his monitor again 5 minutes only to tell me that they don't have.

-Bassam: But sometimes my friends come to get some phototransistors, and you either end up giving them photodiodes or TSOP chips (true story), so I am sure you have something equivalent.

Nabil goes backstage for 5 min and comes back with a TSOP looking chip (not TSOP thou).

-Bassam: Ok great so what is the name/number of this chip? 

Nabil stares at his monitor for 5 minutes only to tell me that they don't know.

-Bassam: Tayeb, what is the carrier frequency for this chip.. anything.. just give me any info.

Needless to say, Nabil didn't know.

I ended up going back to my workshop and spending 2 hrs trying to figure out pointlessly how to make the chip work. So this leaves Katranji with 1 point in my improvised grading scheme.
Don't get me wrong, i have a complicated love/hate relationship with Katranji & Nabil that only the people knowledgeable in electronics in Lebanon would understand, but you have to admit Katranji does have a wide and good range of components available. And most of the time, if you were instructive and knew what you want, you will end up finding at Katranji's.

Getting frustrated. I called Incotel. The guy was really friendly. and as soon as I told him  I need a TSOP1738, he told me that they don't have it but they have something equivalent. I couldn't believe it. His voice was like a divine melody in my ear. I went to Incotel, got the needed chip. The guy even suggested a IR led that works on the same wavelength as my chip. Perfect +10pts for Incotel for their great customer support. 

So I bought 4 TSOPs and 4 LEDs and was about to leave when I asked for the bill. Ok. -8pts for Incotel. I won't tell you the price so that you won't get depressed. But I can say that it was the expected price x4!!

This leaves Incotel with 2pts on my improvised grading scheme.

Incotel 2pts vs.  Katranji 1pt

Well if you don't care about price. Go to Incotel... but honestly you'd be better off gathering a big component list and ordering from abroad. 

N.B. I will be criticizing other electronics shops as I write in my blog. And I will be elaborating more on my love/hate relationship with Katranji and Nabil.