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Another lockdown project - micro FHSS transmitter

How small?

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Phil Green02/07/2020 13:21:10
1616 forum posts
343 photos

Heres another lockdown project, just for fun.
So how small can a useful homebrew R/C transmitter be?

It does have all the facilities of the 7c+sc encoder including reversing, minute-minder, inactivity alarm, mixers including the S/C mix, etc... but of course these are mostly not wired

It uses my own FHSS code on the NRF24L01 and the 'stick' is a proportional 2-axis unit from a PSP gamepad - it has poor centring so its programmed with a narrow 'dead band' at neutral which is not noticeable in use but gives accurate centring. The on/off switch is one segment of a DIPswitch. You've probably guessed whats inside!







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 torch, the two-AAA's battery-holder half:



Heres the 'stick': proportional micro-stick unit




Also available on ebay: **LINK**

The tranny runs the same FHSS code with a deliberately common guid & hopping scheme so I can use any of my homebrew trannies with any of my models.
Its not yet flown but I will! with the ease of swapping transmitters in-flight it would be rude not to... wink 2

Whilst its not a serious project, just lockdown entertainment, it does work well and has about 50 yards range with the homebrew rxs smiley
Might suit a 'Footy' yacht or a model rock-crawler?  or perfect for an indoor flyer!

Many more lockdown projects and more nrf stuff over on mode-zero





Edited By Phil Green on 02/07/2020 13:32:52

Bob Cotsford02/07/2020 15:24:35
8646 forum posts
483 photos

What, couldn't you squeeze in a throttlesurprise? Absolutely brilliant Phillaughthumbs up

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