Quanum Nova & Cheerson CX-20 (Open Source APM-FC version) - Tech Addendum

As you know, most of my posts here are about my experiences with my Quanum Novas (a clone of the Cheerson CX-20 with the same Open-Source APM Flight Controller). Please search this blog (top left) if you are looking for something specific. This post will hold summaries and misc info that hasn't been posted before about this quadcopter. It will likely be added/edited frequently.

Verified as Working Custom Firmwares:
These are verified by me to work. I think pilots should be reminded that even if a posted archive is described as being some ArduCopter version, don't assume all posted custom-hex firmwares on the Internet are the same (chances are 99% they are not ... due to custom code changes and compiler settings).

v3.1.5 - VinnieRC's Custom ArduCopter v3.1.5
- http://www.rcgroups.com/forums/showpost.php?p=31678509&postcount=24678

ArduCopter.3.1.5-quad-apm2-CX20.zip
(Original posted archive holding ArduCopter.3.1.5-quad-apm2-CX20.hex)
MD5 Checksum: A24C2871AE252108E5B24D9BC438D2A8
SHA-1 Checksum: 568BC233BAFDD94CB903D2ED166B8379CB88589A
Generated by MD5 & SHA-1 Checksum Utility
  http://raylin.wordpress.com/downloads/md5-sha-1-checksum-utility

ArduCopter.3.1.5-quad-apm2-CX20.hex
MD5 Checksum: 9C124499E57906CC6F4FF4060290B66F
SHA-1 Checksum: 143EEC489C451832F33C75D6EBA7CAE3F5A60B71
Generated by MD5 & SHA-1 Checksum Utility
  http://raylin.wordpress.com/downloads/md5-sha-1-checksum-utility

This specific v3.1.5 works fine (including data-flash memory and logging feature) on two different versions of Cheerson installed APM-FC (in my Quanum Novas). Since my quads are working, I haven't found a need to look at the actual source-code. However, if the source-code was different (from any other posted archive) it would not pass MD5/SHA-1 verification.

APM_252_v2.0
- http://quadcopter-robotics.blogspot.com/2015/05/upgrading-firmware-to-315-cheerson.html
APM_252_v5.0
- http://quadcopter-robotics.blogspot.com/2015/09/new-nova-modding-for-flight.html


v3.2.1 - If I ever eventually get around to doing something with v3.2.1, I will post it here also.

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Looks like either Cheerson or GlobalFly actually designed this little APM_v2.52 FC and shared it with the other. Here is a manual that GlobalFly released. (Thanks to RobotShop_com and DKemXR for finding it).

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I've never owned a the RTF version (with the stock white radio gear pre-installed) but these pics might be helpful to some pilots. Thanks to PietPech.

 

This next pic applies to all models (including PnF)

 

 

Another drawing of stock radio connection.

Finally, a pilot's pic from the forum.