Little help requested with a new bot - receiver, material sourcing etc. thanks.

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Kyro
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by Kyro » Thu Jan 16, 2020 11:12 am

my friend got them cut through kcut.

and yes 2mm gr5 ti

i will ask her where she sourced the titanium and get back to you
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EddieJ
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by EddieJ » Thu Jan 16, 2020 3:22 pm

JoeHLloyd wrote:
Wed Jan 15, 2020 5:47 pm
What are PPM and SBUS? Connector types? Also, it's all weight-sensitive!
SBUS and PPM are different ways the RX outputs signal for use by other components. Main difference is with SBUS you will get 3 wires that output 4 channels all together. Usually used for plugging into a flight control board on drones, which will have all the feedback from gyro, accelerometer, etc then output signal to ESCs. You dont need the extra board, so PPM is the way to go :)

Good luck with the build! (make a log :D )
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GeorgeR
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by GeorgeR » Thu Jan 16, 2020 4:17 pm

Afraid you're not quite right there Eddie, PWM (not PPM) is the one you want.
PPM is similar to sbus in that it is a single wire for the signals.
PWM is the one that you're thinking of where each channel has its own signal wire.

As for titanium, I've always had good luck with ebay.
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MarkR
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by MarkR » Thu Jan 16, 2020 5:13 pm

Yes - as Eddie and George already mentioned - the single-wire bus interfaces that drones RXs use, are NOT compatible with most of the speed controllers used in Antweights.

In particular, if you want to run more than one ESC (e.g. one for a spinning weapon, and another for the drive), there probably aren't enough pins. All the channels are mixed up in the SBUS/ibus/cppm signals (in different incompatible ways).

(NB: Because I'm a bit crazy, I actually built my own ESCs which do use SBUS/ibus etc)
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EddieJ
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by EddieJ » Thu Jan 16, 2020 5:43 pm

Ahh yea that one! PWM. I'm mixing acronyms. Thanks for the clarity George! :)
Joe, in case you already bought it - dont fret, the RX i linked is still good for you - it is actually PWM (only I dont know my PWMs from my PPMs :P )
MarkR wrote:
Thu Jan 16, 2020 5:13 pm
(NB: Because I'm a bit crazy, I actually built my own ESCs which do use SBUS/ibus etc)
We like crazy people. They are the best at innovation ;)
Is it a small ESC?
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MarkR
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by MarkR » Thu Jan 16, 2020 8:17 pm

EddieJ wrote:
Thu Jan 16, 2020 5:43 pm

Is it a small ESC?
Approx 26x24 mm. This is slightly bigger than the Dasmikro, but mine has one more channel (3 channels instead of 2)

https://github.com/MarkR42/malenki-esc <-- info here.
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EddieJ
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Re: Little help requested with a new bot - receiver, material sourcing etc. thanks.

Post by EddieJ » Fri Jan 17, 2020 1:03 pm

Really awesome! 1 more channel for brushed motors is a real godsend for flippers and axes.
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