Enable PPM on Micro Scisky FC with External Receiver (Quanum Pico)

by Oscar

Some good news for those who are looking for a cheap micro brushed FC, and only want to run Frsky TX. I managed to connect a PPM receiver to the Micro Scisky board (aka Quanum Pico).

The Scisky flight controller is an affordable board for micro brushed quadcopters. It allows you to run Cleanflight and Betaflight on it. Unfortunately it only comes with an integrated Spektrum DSM2 receiver, and there seemed to be no way of connecting a Frsky PPM receiver.

Many people including myself runs a Taranis, or other transmitters with Frsky TX module. Therefore we were unable to use this built-in RX without paying extra for an additional Orange TX module.

Fear no more! :) Here is how you can “hack” into the Scisky board, and enable PPM!

Find the PPM Receiver Pin

We can attach an external PPM receiver to the flight controller.

The PPM (CH1) pin’s location is shown below in the picture, and it’s covered in insulation material. You need to scrape off the solder mask to reveal the pin.

Micro Scisky quanum pico brushed fc PPM external rx connection pins 5V 3.3V GND

Use whatever tool you think sensible. I used a small pointy-ended file for the job. Be really careful and gentle, only work on the pin, and do not touch the traces/pins around it. Otherwise it would make soldering a lot harder and messier later on.

After you have scraped off the mask, apply some solder paste on the pin, and put a bit of solder on the pin with your soldering iron.

Micro Scisky quanum pico brushed fc scrape off silicon paint expose pins pad

Connecting your favourite PPM Receiver

Depends on your choice of PPM receiver, choose whichever power suitable for it (5V or 3.3V).

I am using the SRP8 8CH PPM receiver, which requires 5V. If you use one of the Micro Frsky RX, then you might need 3.3V for it.

Micro Scisky quanum pico brushed fc PPM external rx connection SRP8 receiver

Here is a close up of the wire soldering (PPM, 5V and GND). Make sure you check the voltages with multimeter before connecting your receiver!

Micro Scisky quanum pico brushed fc PPM external rx soldering wiring

After that, Change Receiver Type to PPM in Cleanflight (originally Serial receiver), and you should now see the bars move with your sticks in the receiver tab :)

Lastly I think it would be a good idea to secure the wires/solder joints with hot glue. Especially the PPM pin is pretty weak.

Let me know if you have any comment, or know any other tricks with using the Pico FC.

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17 comments

Mel 7th February 2017 - 2:16 am

I have the new board too. Has anyone figured out where to solder the SRP8 8CH PPM receiver to yet?

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marcus dowell 2nd January 2017 - 11:01 pm

can i do this with a flysky receiver?

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Jim Pickett 26th November 2016 - 4:12 pm

Any advice on the spr f3 evo with built in flysky rx? I just got it and found it wont work with the the TGY i6s because the rx is on the old afhds. If the above method would work, I’ll try it once I can identify the ppm.

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Gfromitaly 26th September 2016 - 11:16 pm

I just wanna thank you for all informations I find every day on this blog. You are doing a great job for the coomunity.
Which is better way to stay update with your posts? This blog, fb, youtube… You have a newsletter too?
Tons of good karma on you.
G.

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Oscar 3rd October 2016 - 3:52 pm

you can follow me on FB :) I post my new posts there regularly :)
https://www.facebook.com/intofpv

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Ollie 24th September 2016 - 10:42 am

Has anyone found a way to hack the ‘new’ scisky board layout for PPM? Can’t find a manual anywhere..!
Someone please help!! Cheers

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Dane 7th September 2016 - 12:52 am

Hi Oscar. Banggood came out with a new version of the scisky and we were following your directions that shows the now outdated model. So we unfortunately were shipped the new board. Are you familiar at all with it? Any direction as to how to hack this new board? They haven’t updated all the pics yet on banggood…there’s only one of the new board down by the clean flight config screenshot. Any help would be much appreciated.

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Oscar 9th September 2016 - 3:07 pm

new version? sorry i can’t seem to find the difference? do you have the link?

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calum 20th September 2016 - 1:17 pm

It looks like the new version had come up on hobby king new items page, amd linked from the old version now discontinued.

There appears to be be a single port now and two rows of pins.

There is also mention of dsmx, and a button on the board, but no real useful into in manual.
hobbyking.com/hobbyking/store/__110344__Quanum_Pico_32bit_Brushed_Flight_Control_Board_DSM2_DSMX_Compatible.html

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Oscar 22nd September 2016 - 2:52 pm

i think the old version is still available at BG.. sorry i don’t have this FC and can’t provide much support on it…

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Jeremy 10th September 2016 - 11:41 pm

Hi Oscar,
Thanks for this tutorial! I also have the new version. How did you find the trace that was needed for the ppm? Is there a pin on the microcontroller that we can solder directly to? Or that I can trace to a via or pad to solder to?
Jeremy

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Oscar 12th September 2016 - 2:21 am

trace it back to the MCU :) do you have the “new version” too? any picture of the top of the board?

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Lilo 1st August 2016 - 10:10 am

Now that we have available Micro sp racing F3 brushed with PPM and sbus inputs for only 18$, scisky flight controller becomes irrellevant and a thing from the past.

banggood.com/Micro-32bits-Brushed-Flight-Control-Board-Based-On-SP-RACING-F3-EVO-Brush-For-Micro-FPV-Frame-p-1070068.html

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Ole-Petter Rong 30th July 2016 - 10:56 am

Great post for people that already have this laying around.

But if you know your going for FrSky TX why not simple buy a brushed controller that dont have dms2 already connected?

Like this F3 based controller:
http://intofpv.com/t-evo-f3-micro-brushed-fc

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Oscar 7th August 2016 - 2:25 pm

1. this board wasn’t available at the time i wrote this post.
2. a lot of people already own the Scisky

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Sebastian 30th July 2016 - 12:01 am

Nice!! I might build a brushed setup in a little while and I was already looking at that FC, but was also a bit unhappy about the DSM2 protocol receiver… this might do the trick for me!!
One question:
Why exactly that receiver??
Could this be an alternative?? (I would unsolder the pins myself…)
banggood.com/DIY-FRSKY-8CH-Receiver-RX-PPM-Output-For-X9DPLUS-XJT-DJT-DFT-DHT-p-987247.html

Or could I use a normal XSR
banggood.com/FrSky-XSR-2_4GHz-16CH-ACCST-Receiver-S-Bus-CPPM-Output-Support-X9D-X9E-X9DP-X12S-X-Series-p-1031481.html
Maybe we could even use Smart Port Telemtry?? For VBAT??

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Oscar 30th July 2016 - 2:26 am

Weight, the SRP8 is only 1.5g

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