Bandwidth! If we want to have a bunch of remotes in close proximity, 868Mhz only has a narrow legal band. Also in America it should be 915Mhz if I’m not mistaken, while 2.4 is mostly legal everywhere if using little amounts of power.
Just curious, have you found any problems with the sx1280 module? In all my testing RF performance was never an issue. And beware of IPEX connectors, they don’t like vibrations and tend to come off at the worst possible time.
Havent looked into this that much, but aren’t 800 and 900mhz bands less filled up comparing to 2.4ghz where you are competing with 100 desk printers in some urban areas?
Transceiver supports both 800mhz and 900mhz bands.
Ran out of warm days in autumn, but with 30km’s on clock at worst places it was stable. However I’m always striving for better product and have that paranoya that one day 2.4Ghz will be too clogged up for even lora remotes.
Smaller versions work on laptops just fine, true to be told, there is a case that keeps the connector in place, thus youre figthing more against corrosion than anything else. On other note, PCB antena is difficult but possible option.
Laptops aren’t land missiles that to and vibrate themselves to death.
Thanks this is how I’m gonna describe my esk8 to pedestrians from now on.
That’s a related but different issue. LoRa is a spread spectrum modulation designed for noisy environments, and as such works well in this exact case. However if you run out of “channels” to place LoRa devices because your bandwidth is limited, you could have several remotes using LoRa on top of each other competing for airtime and that’s where problems can arise.
Not to mention that if you use an American band in the EU or vice-versa you are competing against cell towers and phones going full blast (in the W range, not mW) instead of printers.
TBS crossfire is a 900MHz protocol that’s very popular with fpv and it has switchable 868 and 915MHz mode, it’s very possible to get around that with a menu setting/switch. it also allows for 10 or more pilots flying at the same time, i bet it’s possible to use it
tho at the same time, having multiple DIY remote “brands” that can pop up, that end up also using 900MHz, would be a problem in a large group ride yaaaaaa
if you’re using a LoRa based chip, you can also check out FLRC modulation which allows better signal sensitivity, so it allows for more range,
or maybe in this case since we’re blasting RF into our baby juice generators which isnt that far, better SNR? (i dunno about that last part, it’s just me doin a 1 + 1 maybe = 2)
i’m just throwin stuff out there 
Yeah, I know, but I’ve also known a lot of FPV pilots that wondered why they were failsafing like crazy with their new crsf gear and it ended up being that they selected the wrong frequency out of ignorance or carelessness…
With esk8 the stakes are higher and I didn’t feel comfortable with that as a first option, also taking into account how well LoRa works @ 2.4GHz. At any rate it should be super easy to use another module running at different frequencies if anyone really wants/needs to. I just tried to select the safest design parameters by default!
that is true
i would go as far to say that esk8 people tend to be, worse when ut comes to that😳
you can also check out ELRS, it’s open source, and you might benefit from it? i don’t know mucb of it but it’s becoming very popular very quicj
Does anyone need atmegas, pcbs, parts? I have them all but the shell and battery and am in TX. I made my own remote, it’s fine detailed work that I don’t feel like doing for another 10 or so remotes. ~$40 for parts, ~$5-10 for shipping, pm to work it out!
The parts you would get:
| PCB | 2 |
|---|---|
| Atmega 328P | 2 |
| SX1280 LoRa | 2 |
| USB C Charge Board | 1 |
| 5v Booster | 1 |
| JST PH 2.0 Female | 1 |
| Magnets | 2 |
| Hall Sensor | 2 |
| Bearing | 2 |
| Vibration Motor | 1 |
| Brass Inserts | 6 |
| Screws | 6 |
| Wires | 1 |
| Springs | 2 |
Last note, I opted for USB C instead of micro. This means there is an extra tab on the board that conflicts with the source design files.
Highlighted in red are the offending walls and tabs. You can either cut the tabs off the usb c board or remove the wall in the 3dp(what I did).
USB C Fusion 360:
Thumbwheel Base, USB C, NO BATTERY WALL.f3d (1.2 MB)
Round Base ALT, USB C, NO BATTERY WALL.f3d (1.3 MB)
Round Base, USB C, NO BATTERY WALL.f3d (1.3 MB)
Dual Trigger Base, USB C, NO BATTERY WALL.f3d (1.5 MB)
It’s complete, what updates do you need?
I thought this was still in development. Must have missed the completion point.
I don’t have the tools to assemble this (i.e. reflow oven & 3d printer) Is anyone selling these?
Sorry, I’ve been kinda disconnected from the forum for some months now. Life happened (I’m a dad now!) and that + other unrelated projects took priority. Slowly getting back into esk8 now, but I started by making some batteries because my LiPos died during the winter 
I should definitely mark this as v1.0 somewhere, because I can confidently say now the first version is both feature complete and thoroughly tested (about 8 remotes that I know of in the wild without issues in different environments and a few thousand kms between all of them). I still want to make some improvements in the future when/if I find the time:
I seem to always make the same list, but if I find the time it’s easier to tackle the most requested stuff if I find it in the latest comment xD
If you have built, plan to build or use one, please do share! I know a lot of people have been put off by the DIY nature of this project and the security implications, but it’s impossible for me to build and sell these given the baby, a full time job and my other hobbies/obligations. All I can promise is to try and make this even safer and easier to build with future revisions.
Complete like your skateboard?
As of today, this is kinda true.
Except that one thing…
There’s always that one thing lol
