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lucysrausch / hoverboard-firmware-hack

New Hoverboard Firmware Hack. Now written from scratch and generally much better.
GNU General Public License v3.0
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Can control Hoverboard motors with PWM but not PPM #158

Closed mccgregory closed 3 years ago

mccgregory commented 3 years ago

Hi, I have been following you for some time. Absolutely excellent work! Thank you so much for your efforts and your generosity in sharing it- what a great team effort! In trying to replicate your work – I would like to achieve a 4WD robot driven on ‘missions’ by a drone Flight Controller. The Flight Controller requires PPM- output. With your project I can achieve PWM output, but haven’t been able to get PPM to work. The RC Transmitter I am using is a FlySky FS-i6X Transmitter and FS-IA6B Receiver. My MainBoard was bought, new, especially for this project and is very similar to the one shown in NiklasFauth’s GitHub page. I have checked the output from the Receiver is PPM (as the TX is capable of PWM & PPM) and that it is actually working by connecting the RX to the Flight Controller and checking the virtual controls (also checked with a logic analyser). Can you think of any diagnosis, Trouble-shooting or fault finding I can do with the Hoverboard Mainboard to help me resolve this? I do have some background in electronics with the required test equipment – what should I be looking for? I have no problems with changing the Config.h file and re-compiling – I have tried several different downloads and have EVEN used the code via https://pionierland.de/hoverhack/ and used RoboDurden’s hex/bin files direct without any success for PPM control.

I haven’t tried DEBUG MODE – would this give any indication of the PPM signals being received?

Thank you in anticipation All the Best with your imaginative projects! Greg

Candas1 commented 3 years ago

Hi, have you tried changing the number of channels in the firmware ?

mccgregory commented 3 years ago

Hi, thanks for the reply.

Do you mean in the line:

define PPM_NUM_CHANNELS 6 // total number of PPM channels to receive, even if they are not used.

If so, then my Receiver (FS-IA6B) has 6 Channels and therefore the line is correct?

Best regards

Greg

From: Candas1 notifications@github.com Sent: 13 October 2020 16:27 To: NiklasFauth/hoverboard-firmware-hack hoverboard-firmware-hack@noreply.github.com Cc: mccgregory mccgregor.gm@gmail.com; Author author@noreply.github.com Subject: Re: [NiklasFauth/hoverboard-firmware-hack] Can control Hoverboard motors with PWM but not PPM (#158)

Hi, have you tried changing the number of channels in the firmware ?

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Candas1 commented 3 years ago

Try 8

mccgregory commented 3 years ago

Well that’s puzzling!

It works!

Thank you very much!

Much appreciated – I’ve been struggling with this on-and-off for hours over the last few weeks.

One question here, and I have a solution.

Thanks again!

Greg

From: Candas1 notifications@github.com Sent: 14 October 2020 09:04 To: NiklasFauth/hoverboard-firmware-hack hoverboard-firmware-hack@noreply.github.com Cc: mccgregory mccgregor.gm@gmail.com; Author author@noreply.github.com Subject: Re: [NiklasFauth/hoverboard-firmware-hack] Can control Hoverboard motors with PWM but not PPM (#158)

Try 8

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mccgregory commented 3 years ago

Candas1 suggested I set it to 8 Channels instead of the default (and correct number) of 6. That works! Thank you.

mccgregory commented 3 years ago

I have since rechecked the Receiver spec. and everything I have seen shows it as 6 Channels. I have tested the RX and found although it has 6 x PWM Channels (limited by physical hardware) it is outputting 8 x PPM Channels when set to PPM.

Candas1 commented 3 years ago

Yes I know it because I have the same receiver. If you want to benefit from FOC motor control and ibus protocol you could also try this firmware https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC It has a recent bug that has to be fixed though. Join the telegram group, you can get quick help there as well.

mccgregory commented 3 years ago

Can't seem to attach file or picture. Previous comment (above) gave me the option but didn't deliver - anyway it shows definite 8 Channels, so the spec. for the RX would be more accurate if it said 6 x PWM Channels. As a touch of irony, having solved this problem, I don't need to worry as the Flight Controller input is PPM, but the Motor Outputs are PWM! :o)