Comments for The Memoirs of Jim 'ung

Comment on Syma 107G Controller Library by Max

Max — Sat, 02 Feb 2013 18:28:52 +0000

Hello Jim

It is possible to see your arduino code with smooth equelizer — this from YT ?

Greetings

Max

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Reverse Engineering the Propel ExecuHeli IR Protocol | PetaVolt

Reverse Engineering the Propel ExecuHeli IR Protocol | PetaVolt — Mon, 21 Jan 2013 17:34:08 +0000

[…] which would lead to the helicopter falling out of air or strange things. Well, after reading this I compared how often a packet was sent on the three different channels. That is in fact how it […]

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Jim

Jim — Wed, 02 Jan 2013 12:22:26 +0000

Ahh - that's really interesting! I'm in the process of taking a few other IR-controlled flying toys apart right now, but based on your tip I think I'll pick up one of those 4 channel choppers and revisit the Syma protocol. It's interesting that the 3-channel S107G controller works but doesn't allow you to strafe - based on how most of the other control registers work, I'd assume that the swash-plate servos responsible for the strafe control would be centered on '63', right on '0-62' and left on '64-127', which means that the Trim control on the S107G controller would also adjust the Strafe on the S800G. From a couple of S800G review videos on youtube, it does appear that the S800G's strafe has a graduated control servo so I can't really image how else they do it! I guess we'll just have to find out... Jim

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Michał

Michał — Tue, 01 Jan 2013 22:04:25 +0000

hi,

about the fourth byte:
I’ve got s107 and s800g helicopters. s800g has additional axis on remote for strafe left-right (i believe it is called “roll” in planes). It is probably using the fourth byte. The remotes are exchangeable, ie. I can use any of them to any of the coppters. Of course you can not strafe with 3-axis remote . The trim knob is working always as the trim.

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Jim

Jim — Tue, 18 Dec 2012 08:05:10 +0000

Hey Kerry — thanks! I was really surprised too, it’s certainly whet my appetite to learn more about how toys like this work.

On a side note, I want to say thanks for writing up your own analysis on this topic, I’m new to this kind of thing and I can honestly say I probably wouldn’t have been able to get my head around it without having first read your great article.

Take care,

Jim

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Kerry

Kerry — Thu, 13 Dec 2012 02:48:27 +0000

Hi Jim,

It’s great to see your detailed work here!

I am a little surprised to see different protocols in different S107 revisions, and even more surprised to hear that either protocol can be used to control the S107.

Comment on Reverse-Engineering a Syma 107 RC Helicopter by hawat

hawat — Mon, 10 Dec 2012 00:47:53 +0000

Looks like some kind of variation of original NEC IR protocol. NEC uses 4 bytes. Its — in theory — possible to fly this thing using universal tv remote.

Comment on Reverse-Engineering a Syma 107 RC Helicopter by Reverse Engineering an IR Protocol | µC eXperiment

Reverse Engineering an IR Protocol | µC eXperiment — Sun, 09 Dec 2012 20:18:40 +0000

[…] Reverse-Engineering a Syma 107 RC Helicopter […]

Comment on Reverse-Engineering a Syma 107 RC Helicopter by – More Fun with Syma 107 Reverse Engineering

– More Fun with Syma 107 Reverse Engineering — Sun, 09 Dec 2012 04:45:03 +0000

[…] used a logic analyzer to do some in depth analysis of the Syma 107G helicopter’s IR protocol. We’ve seen work to reverse engineer this protocol in the past, but [Jim] has improved upon it. […]

Comment on Reverse-Engineering a Syma 107 RC Helicopter by andrewia

andrewia — Sun, 09 Dec 2012 00:57:39 +0000

Great work! This was really interesting to read. Hope you have fun with that logic analyzer; it seems really useful.