ExpressLRS
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ExpressLRS
PPM Mode ARM on Ch5: Conflicts with Built-In Mixes in Older Systems (Futaba, Hitec)
Current Behavior
ELRS v3.4 added the support for the PPM input. This allows using ELRS Tx modules with older radio systems (Futaba, Hitec, Graupner, etc.). These systems are still very capable, especially for traditional R/C planes. However, many in-built wing mixes, (e.g. butterfly) collide with the channel 5 that is reserved for ARMing. Typically, it is not possible to re-map the mix to a different channel.
Steps to Reproduce
Use any kind of an older radio as the signal source for the ELRS Tx Module.
Possible Solution (Not obligatory)
Change the order of channels such the Ch5 for ARMing is the last one. This one is typically free. Now: CH1, CH2, CH3, CH4, CH5, CH6, CH7, CH8, CH9 New: CH1, CH2, CH3, CH4, CH6, CH7, CH8, CH9, CH5 Alternatively, clarify in the manual if it is safe to permanently operate the system ARMed and provide the solution to enforce so.
Details
Original PPM Pull request: https://github.com/ExpressLRS/ExpressLRS/pull/2528
Your Environment
- TX hardware: Futaba T9CAP with Jumper Aion ELRS 2.4G TX Nano
- RX hardware: any
- ExpressLRS version (TX & RX MUST MATCH): v3.4 FCC
Many thanks to all of you for consideration and your hard work.
It can by solved by PR #2801 or #2869
This is excellent reply @stanislavdavid . I actually like the Limits feature as well as the radio misses it. It would be great adding these PRs.
It would be great adding these PRs.
Yess! in particular, https://github.com/ExpressLRS/ExpressLRS/pull/2869 is a game changer for a lot of things. A lot of older FBLS as well, such as original original BeastX can use Sbus, but not the SUMD implementation as just 1 of many this will fix, yet allow keeeping the Chan5 arming specification.
