RF-Nano
Ready-made receivers! I was hesitant at first thinking they were CH340G powered but yay they have a proper LP2985-33 regulator for the NRF. The full rundown is here:
https://github.com/emakefun/emakefun-na ... er/RF-Nano
The only change I can see is they have CE & CSN (D9 & D10) reversed wrt our sketch. The receiver will be slightly larger, but much easier with no NRF wiring to do!
https://www.ebay.co.uk/itm/5-V-RF-Nano- ... 3672433034
cheaper from Ali, I've ordered 3:
https://www.aliexpress.com/item/32980796969.html
We just tried an experiment. In the software we set one of the NRF24 transmitters to absolute minimum power, and fitted one of the tiny 'built-in aerial' boards - so it was as low an ERP as you can get. Then Dave drove the Schumacher car chassis around "bollards" which were actually eight switched-on transmitters - three Frsky ACCST conversions (Sprengbrook, Horizon and Kraft) , two Futaba FASST (daves 6EXA and my 7C) The Logictrol Flysky conversion, the Waltron (OrangeRx DSM2) and a DX5e, all switched on and on full power. Dave ran a battery flat weaving between these hazards with not a hiccup from the radio. The only difference we noticed was that as you'd expect, it hops more often in a busy band. I'm really impressed for such a cheap RF board!
Tobe wrote: ↑13 Apr 2020, 19:40
My suggestion for a servo lead/connector from the Rx. Most of us have plenty to spare pin heads but not as many servo leads! As a bonus you save 6 wires, 3 + and 3 - ( each bundle is of 4 wires, total 8 against 14 wires) I'm a firm believer in twisted wires.
Thats a great idea Tobe, very tidy - but you can save one more wire - D8 is held low as a convenient 'link' ground for the failsafe input on D7 - you already have negative on the block so the failsafe can be one wire not two! Thinking about it, in the receiver I will move failsafe from D7 to D8, leaving D6 & D7 free for two more channels in a neat row. In this case only D8 needs to go to your 'distribution block' . I do like your idea though, I'll do my next rx your way
(Edit: next but one!]
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Meanwhile, I just made another Promini receiver, this one is just 2 channels for Roo's model car. Took some pics this time:
- flyleads soldered to the NRF24, DST at the ready
- NRF24 mounted with 2 layers of DST on the back of the ProMini.
Aerial overhangs a few mm to avoid masking
- all finished, programmed & tested
- ... and some clear heatshrink
- The result is quite a small 2ch receiver. Cost about £4 all in.
- Eleven quid for all these incl delivery, UK seller
I do wish they wouldnt solder headers though, fiddly to remove
Resurrected an old Schumacher chassis - excuse Daves driving as he had the throttle & steeriing on one stick!
I find
Martins scanner is an essential tool for playing with RF modules and generally checking if stuff works.
Tobes post just prompted me to make another one, just to pass 15 minutes, works great, just fits nicely into a tic-tac mints case (minus the battery unforch):
Showing the six hopping channels of the NRF24 R/C project....
Incidentally, re the display numbering, the larger number SSD1306 is the smaller 0.96" display, and the smaller number SSD1106 is the larger 1.3" display. I find this confusing, so I have to double-check every time...
The old ebay red boards make the transmitter easy Tobe as they have a 3v3 regulator, the other easy option is the NRF converters you mentioned earlier... for the receivers the 3v3 8mhz prominis are easiest and keeps it compact... but like you I just use whatever I have to hand... like 45 year old displays
Cheers
Phil