Samurai Setup para receber circuito

Poderia passer a tupia conforme descrito na imagem abaixo.

Isso vai permitir que eu faca a instalacao dos components eletronicos que pretendo instalar no skate.


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Bluetooth Controler – Super CPU

There is out there now super compact CPUs like the below that actually are small enought to fit in the board… possibilities are amazing!

integrated, GPS, on-line video streaming, all kinds of cyber integration and integration with the rider and  motor control and power management…. you could actually use neuro sensing modules with this .. you just think GO and the board starts running at the rate you fell confortable or race it to the limit if you “fell” like “need for speed”



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Bluetooth Controller – Found a Similar project

Guys, the video below shows a WII nuchuck controlling a servo via Arduino…

That’s exactly the same idea we want to use for the ESC for the board’s motor.


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Batteries and ESC arrived ! Finally got all parts … lets get this baby completed.

Yesterday my batteries and ESC arrived.

That completed all needed from my Parts list 

I’ve ordered 2 Batteries 22.v@5000mAh (30c) this way while one is in the board the other is charging or is with me for back up replacemant.

They are bigger ans scarrier then I though … 😀 … LOVED them !

(they are the most expensive parts I’ve bought so far, hardly will do something like that again 😀 )

I might use both batteris at once in the board (in parallel ) for a 10000mAh (30C) power reservoir … that will give the capability to cruise for a few hours (I hope).

ESC is a cheap one, that I will program as if it is an R/C car… that should help not overload the ESC and not burn it down.

I’m now machinning the motor/truck bracket …

once it is done it will be time for E-LBoarding

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Background Idea for the BlueTooth Remote

The below was originally a post response, them I realized that it’s actually a good summary on what I’m trying to do with the BluetoothController.

Not sure if i will do everything that is described bellow , but at least we can build the minimal to get it working and implement and enhance the rest gradually.

======  So here it is ============

Using CELL PHONE or WII Accelerometers to build a Bluetooth remote.

We actually only need anything that can send 256 values (0 to 255) … that’s all possible values in a 8 bit range data signal.

Usually, entry level cheap accelerometers can work with values ,for instance, up to 6 Gs , where  0 G = 0 and 6 Gs = 255

Therefore , as a simple and pratical use of accelerometer, we will only use something between 0 G and 1 G, Kind if you exposing your cell or wii remote in the same direction of earths gravity it will became aprox 1 G and if you start turning it , in a tangent axis to earth’s gravity one, values will start to change between 0G and 1G, and if you shake it really hard, making the accelerometer go above 1 G, we can for instance, program to ignore those values.

Therefore, if 6 G = 255 then 1 G will be aprox = 42

We will convert those 43 possible values range (0 to 42) to a wider range of values, building a mapping table in the microcontroller firmware (lets call it TABLE_A )

where 0 G from accelerometer is, as an example, equal to 0 (or a range from 0 to 10) on TABLE_A and 42 from accelerometer is equal to 255 in table A and values in between do not need to have a direct and linear relationship between them, we can design a mapping table that takes the best perofrmance considering motor/esc/load/speed/acceleration/batery saving, etc.. We can also, for instance, implement in this TABLE_A values limits to avoid component damage.

Now, about ESC , they work based on stream of pulses, where these pulses have a time length, for instance : 1 milisecond wide pulse = no power , 2 ms = full power and values in between are dependent on ESC programing (not always they are linear)

(there is more to that, such as safety features and other programing options loaded in the ESC, but in regards on once it is intialized and all set the time limit values above are pretty much standard everywhere and widely used)

The video below shows a servo control signal, that’s also the same for ESC

servo control



we can convert values from TABLE_A in pulses , and more, we can use another mapping table for that…lets call it TABLE_M

Therefore a range of values in TABLE_A can represent a linear or non linear range of values in TABLE_M where each value or range of values from TABLE_M represents a pulse length that is sent from microcontroller to ESC

so lets say…

TABLE_A : Values from 0 to 10 is equal to TABLE_M : Values 0 to 15 and that Range is equal to 1 ms, therefore motor is stoped , or breaking or running really slow.


TABLE_A : Values 20 to 40 are equal to TABLE_M : Values 60 to 100 and that is equal to 1.5 ms pulse to ESC, therefore motor is running at half power.

So, the Idea of working with these Mapping tables is that you can also add other variants from other sensors , such as, Current, Voltage and Temperature sensors connected to ESC and another accelerometer and speed sensor connected to the board where they can feed the microcontroller with that data and change the mapping table (like using Kalman algorythms) to do things like :

  • to avoid component damamge,
  • to set the board for high speed or for economy cruise,
  • to avoid over acceleration or breaking that may cause you to fall from the board,
  • you can also install a sensor that if you fall from the board it automatically breaks and stops the board using the motor…
  • You can account for vibration from the ride itself and eliminate it on the software using filtering routines.

so, pretty much sky (and microcontroller memory ) is the limit here.

All the above looks a lot to do, but actually 99% of it is already available on any microcontroller vendor site.. you just need to tweek it to your liking, on how you wanna ride the board.

Sooo.. that’s what I’m up too with the Blue Tooth Remote

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Motor Arrived !!! Finaly !!!

Today my motor arrived, I’m still waiting on the batteries and ESC.

motordoskate 001

While they are not here I will make due with some parts I have laying around in the shop.

I will use two batteries : 3S (11.1vts) 4000 mAh  from my quad copter

motordoskate 005

and a 70 Amp ESC from my ducted fan jet that I will connect to a servo tester for now.

motordoskate 003

I will need to do build a connection cable, it will set the two batteries in a series connection, therefore instead of 11.1 vts I will get 22.2 vts @ 4000 mAh .

motordoskate 008

So now I can get this stuff to run

motordoskate 007

I believe I might be able to use the gear above for a quick ride test once they’re installed in the board.

Finally all connected, I’ve tested the motor and it went very well. check the video below

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Threaded Rods Used to align Wheel and Cog

These were the rods I’ve use to :

1 – Used the larger one (8mm) to align the Wheel cog and the wheel centers. Just drilled a hole in the center  of  the cog , them put one top of the other (wheels with the bearings on), tighten them up with a couple of nuts them marked and drilled the position for the holding screws (120 degrees apart) and them wide it up to get clearance on the truck.

2 – The 5/16” Rod (thinner one)  is the one used on the cog and wheel to tight  them together , I’ve cut 3 pieces of it 3 1/2 ‘ long and put a nut on cog side and tigh it up with another nut on the wheel side.


Pic below is using temp screws (1/8′) to hold them together.


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Electric Longboard Parts – Wheel , Cog and Truck Assembly with Test Gear

I’ve just got the small wheel resin cog (copy from the 45 mm dia. one) finalized and attached to the wheel as showed in the picture below

(I found a 70mm old wheel that I will use first, wanna test the process before drilling holes on the brand new green one )


I found that making sure that wheel and cog  are perfect aligned and centered the most difficult part.

I did the following steps:

1 – Got a screw about 3 inches big and as the same diameter as the truck axis (like the inner part of the bearings)

2 – Made a hole in the center of the resin cog the same diameter as the screw

3 – put the wheel and the cog one o top of each other and tightned them together with a nut.

4 – marked where each one of the 3 screws that will hold the cog and wheel togehter will be placed and drilled the holes going trough the cog and wheel at the same time (if your drill is not big enought them you can drill all the way trough the cog and them it will mark the position in the wheel, them you can drill trough the wheel.

5 – remove the cog from the mounting/aligning screew and drilled a bigger hole in the center so the truck can go trough the cog .

The assembly went very nice and is looking like the below


I got some old parts I had laying around to test it , while my parts do not arrive.

I’ve attached one of the motor cog (16 mm dia.) to this old brushed motor and connected to a 12 v/20 amp  power source.

It ran nicely, but I will need to think about reinforcing the motor cog.


Next I will build the motor mount, at least all the way possible without the motor. I will also make a new ruber mold and resin copies from the motor cog, I will try to make the outter part a little larger and stronger.



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Bluetooth Controller – SNAFU – Cellphone is gone

Just felt from my hand and broke the screen.

I will have to code and test using my notebook bluetooth device and them later on convert the windows  app into android app.Image

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Electric Longboard Parts – Cog – Making a Resin Copy (Part 2)

So I got the ruber mold completed, it looks like it came out pretty nice.

now is time to prepare some resin and pour it  into the ruber mold


Above you can see the transparent resin (big pot with a blue circle and a captial “C” showing)

and the catalyst (little recipient with an orange cap). You also see the “load” that is the thing tha makes the part made with this resin realy strong and the black pigment.

Mix it all together at right proportions (therefore the scale)

I’v made enought to do the Wheel Cog and second copy of the motor cog, them I left them to dry on a warm box.


Tomorrow I will post how they came along, also I will start milling the copy to fit in the skate truck and in the truck axis.

Continue reading

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