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Old Dec 23, 2002, 10:23 AM
Living Room Aviator
drliu's Avatar
Joined Jun 2002
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Great work Koichi!

I thought the DigiQ motors were similar in size to the BitChar-G motors (1.55 g)? Aren't they about 6 mm in diameter?

If you are correct and the DigiQ motor weighs only 700 mg, then I'll need to get some of those!

-David
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Old Dec 23, 2002, 10:53 AM
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MSC Rödinghausen, Germany
Joined Feb 2001
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Koichi,

really great work!

Am I right when assuming that to do something similar to your solution one would have to rebuild your infrared transmitter addon, then identify the encoded binary signal path in the transmitter and hook up the addon to that signal. Your PIC code would then generate the 38kHz infrared signal.

To receive this signal I would try to put a pair of infrared detectors to the signal input of Andy Birkett's decoder PIC.

Andy, Graham, what do you think?

Regards, Jochen
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Old Dec 23, 2002, 11:00 AM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
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Koichi,
I'm even more impressed. You took the trouble to lighten the Didel 81t spur gear by making it have spiral spokes instead of just circle lightening holes. How much weight did that save?

It also looks like you made your own rolled balsa fuselage tube.

It looks like your prop was boiled balsa formed over a mold, rather than carved. Am I correct?

Very impressive indeed!

Gordon
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Old Dec 23, 2002, 08:52 PM
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Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
The weight of a DigiQ motor was mistaken. It was 0.9g surely.
It is gear unit 0.8g + motor 0.9g = 1.7g.
Length is short although the diameter of a motor is the same as the thing of Bitchar-G at 6mm.

fuslage rolled and made 1mm balsa.

A propeller is made from a balsa block.
The balsa of specific gravity 0.1g/cm3 is used and the dope which thinned is applied.

PIC which I made operates by 38kHz.



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Old Dec 25, 2002, 04:42 AM
Las Vegas Realtor
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Las Vegas
Joined Feb 2002
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Tanaka san,

Hikoki wa utsukushii desu! This is a beautiful design. I particularly like the prop and the quick-change power unit idea using magnets.

John Brassner
AMA 84036
http://www.inarico.com/misc/rc
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Old Dec 28, 2002, 05:00 AM
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MSC Rödinghausen, Germany
Joined Feb 2001
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Hi all,

I will give Koichi's concept a try. The tx PIC code is working already connected to the teacher/learner plug of my Multiplex Pico Tx. Infrared parts arrived today. I plan to combine Koichi's tx addon with Andy Birkett's rx PIC code.

I'll keep you informed.

Regards, Jochen
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Old Dec 28, 2002, 05:11 AM
Thats NOT indestructible
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Has Koichi given out his code/schematics?

Thanks

Josh
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Old Dec 28, 2002, 05:33 AM
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Josh,

yes, it is on his page (the link is on the first page of this thread), and if you filter the page through http://babelfish.altavista.com then you will get a funny but readable translation.

Regards, Jochen
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Old Dec 28, 2002, 06:42 AM
Thats NOT indestructible
j8m8l's Avatar
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Coool

I wish i was good enuf at electronics to make that!!

Josh
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Old Dec 28, 2002, 03:00 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
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It WORKS! :D

Hi all,

just some minutes ago my infrared system worked the first time on the bench.

In the picture from left to right:

- The transmitter addon, fits to the learner/teacher socket of my Multiplex Pico Tx (crystal can be removed)

- My programmer/tester board with an IR sensor and a PIC processor with Andy Birkett's code in it.

It works on the bench, now I have to make an RX with a SOIC version of the PIC.

Now my costs per rx (excluding DC booster and ESC) go down from 33 EUR to 3,50 EUR.

I'll keep you informed. Thank you very much, Koichi!

Regards, Jochen
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Old Dec 28, 2002, 03:07 PM
Thats NOT indestructible
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London UK
Joined Apr 2002
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Jberg

Some questions

Could that be used with the Z-tron RX's?

How many IR emitters are u using ?

Cant the ESC code be written into the pic?

Do you need the Dc-Dc?

Can you make me one ?

Thanks

Josh
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Old Dec 28, 2002, 03:09 PM
Thats NOT indestructible
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London UK
Joined Apr 2002
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Hey

My bst m8's mum is Japanese, and his dad speaks/reads it, would you guys like me to see if he will translate the nessecary pages for us?

Josh
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Old Dec 28, 2002, 03:44 PM
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Josh,

Quote:
Originally posted by j8m8l
Could that be used with the Z-tron RX's?

How many IR emitters are u using ?

Cant the ESC code be written into the pic?

Do you need the Dc-Dc?

Can you make me one ?
ZTron: don't know, Graham? Mark? Andy?

emitters: 4 up to now, more to come (depends on flight tests)

The ESC code *is* in Andy's PIC code.

DC/DC: Yes, the IR sensor needs 5V, and the coils are stronger at 5V. There are only 4 parts, very small and light (switched capacitor)

At first I will make *me* one (a flyable one), then we will see!

Yes, ask your friend's dad (and perhaps we ask Koichi?)!

Regards, Jochen
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Old Dec 28, 2002, 03:49 PM
Thats NOT indestructible
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London UK
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jberg

i am feeling stupid today

Can you explan how andys code fits into all this?

Thanks

Josh
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Old Dec 29, 2002, 03:39 AM
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Josh,

that's very easy: The signal that the IR sensor generates is directly fed into a PIC chip containing Andy's code, and the coil connectors are directly coming out of this chip, as is the connector to drive the ESC MOSFET gate. This system is *very* similar to a ZTron receiver.

The good and new part is that every thing is publicly know now so that you can make the complete system yourself (tx and rx).

Regards, Jochen
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