Spotted this today:
https://blog.hackster.io/atto-is-or-wil ... 673df5ee15
Makes me wonder how small a Tx we can make, irrespective of whether we really need it miniscule or not I can see merit in a pen sized (& shaped) s/c Tx. The push button would be in the top, twist the top to turn it on/off, and return it to your shirt pocket when not in use. Of course, it must also be a working pen so that you can sign autographs
Batteries could be a set of button cells, but what to do with the "gigantic" RF boards we have at the moment? Add a laser pointer and a sonic screw driver & we have a device any Smart Doctor would covet, would you believe...
How small a Tx can we make (or need)?
- Wayne_H
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How small a Tx can we make (or need)?
Cheers,
Wayne
Once a Retrobate, always a Retrobate............
Wayne
Once a Retrobate, always a Retrobate............
- Phil_G
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Re: How small a Tx can we make (or need)?
This unanswered question has been niggling at me until I just had to give in and have a go
So how small can a useful homebrew R/C transmitter be?
It has all the facilities too, reversing, minute-minder, inactivity alarm, mixers including the S/C mix, etc... but not wired! and its FHSS of course the 'stick' is a proportional 2-axis unit from a PSP or whatever,
it has poor centring so its programmed with a narrow 'dead band' at neutral. The on/off switch is one segment of a DIPswitch. You've probably guessed whats inside!
So how small can a useful homebrew R/C transmitter be?
It has all the facilities too, reversing, minute-minder, inactivity alarm, mixers including the S/C mix, etc... but not wired! and its FHSS of course the 'stick' is a proportional 2-axis unit from a PSP or whatever,
it has poor centring so its programmed with a narrow 'dead band' at neutral. The on/off switch is one segment of a DIPswitch. You've probably guessed whats inside!
- PaulJ
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Re: How small a Tx can we make (or need)?
Brilliant Phil! ...... Can we see the insides? Where is the antenna?
Paul
Paul
- Phil_G
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Re: How small a Tx can we make (or need)?
It uses a proportional micro-stick unit, used I think some pocket games. It doesnt centre that well so is programmed with a narrow 'deadband' which is not noticable in use but gives accurate centring:
Inside its quite cramped, most of the 'stick' is inside the case and next to it is a 100mAh lipo cell.
Mounted in the other case half is of course (you guessed!) a Keywish RF-Nano:
The case is made from half a Poundland LED pocket radio/torch, the two-AAA's battery-holder part:
Also available on ebay: https://www.ebay.co.uk/itm/Repair-Repla ... 2944559289
The stick does look more lieka button but it is actually proportional and runs the same FHSS code so is compatible with all the other stuff Not yet flown - but I will, with the ease of swapping in-flight it would be rude not to...
[Edit: Flown (briefly!) in the Lidl glider at Baildon!]
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Re: How small a Tx can we make (or need)?
Very neat!
Maybe try a tiny accelerometer board, or just the chip, instead of the 'stick' for the next one? Just tilt the whole transmitter around its x and y axes as a substitute for stick movement. You could use your deadband scheme with that too, though perhaps it might not be needed...
Maybe try a tiny accelerometer board, or just the chip, instead of the 'stick' for the next one? Just tilt the whole transmitter around its x and y axes as a substitute for stick movement. You could use your deadband scheme with that too, though perhaps it might not be needed...
- PaulJ
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Re: How small a Tx can we make (or need)?
My god there are some clever bu***rs on this forum!
Your ingenuity seems to know no bounds.......
Paul
Your ingenuity seems to know no bounds.......
Paul
- tiptipflyer
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Re: How small a Tx can we make (or need)?
Brillant Phil,
thanks for the inspiration. I have all items at home (even the micro stick unit), so I just need to build something similar.
Cheers
Frank
thanks for the inspiration. I have all items at home (even the micro stick unit), so I just need to build something similar.
Cheers
Frank
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Re: How small a Tx can we make (or need)?
Yes brilliant!
I have been intensely looking at the video and the pictures, but I cannot detect a button or buttons to operate the minute minder, s/c mixer etc.? I can detect some swift hand movements in the vid, did you use one of those gravity operated switches?
Cheers,
Max.
I have been intensely looking at the video and the pictures, but I cannot detect a button or buttons to operate the minute minder, s/c mixer etc.? I can detect some swift hand movements in the vid, did you use one of those gravity operated switches?
Cheers,
Max.
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- Mike_K
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