Andy Stephenson Posted July 31, 2023 Share Posted July 31, 2023 (edited) The problem with working out which pins are inputs or outputs is that a microcontroller can have pins which can be programmed to be either. If applying power it may be advisable to put a current limiting resistor in the signal line to prevent accidentally powering an output. Edited July 31, 2023 by Andy Stephenson Quote Link to comment Share on other sites More sharing options...
RottenRow Posted July 31, 2023 Share Posted July 31, 2023 All three signal pins go through 470 ohm resistors on the board (if you trace the tracks you can see them) so it won’t hurt getting inputs and outputs mixed up. If it does blow up, that’ll be because the incorrect wiring sequence has been followed… Ie: red to black, black to red, blue to bits… Brian. Quote Link to comment Share on other sites More sharing options...
Andy Stephenson Posted July 31, 2023 Share Posted July 31, 2023 2 minutes ago, RottenRow said: All three signal pins go through 470 ohm resistors on the board (if you trace the tracks you can see them) so it won’t hurt getting inputs and outputs mixed up. If it does blow up, that’ll be because the incorrect wiring sequence has been followed… Ie: red to black, black to red, blue to bits… Brian. Time to start experimenting, then! Quote Link to comment Share on other sites More sharing options...
RottenRow Posted July 31, 2023 Share Posted July 31, 2023 It’s also quite likely that the unit came out of an ARTF model which had servos etc. pre-installed, which would account for the lack of labelling on it. Also, as the probable supplied lead has JR / Spektrum colours and is marked channel 6, I would hasten a guess that the unit splits the receiver output and perhaps reverses one of them for flaps. It might also slow the servos down as well. Channel 6 is the aux 1 / flap channel on Spektrum radios. Brian. 1 Quote Link to comment Share on other sites More sharing options...
KenC Posted July 31, 2023 Author Share Posted July 31, 2023 (edited) servo test.mp4 servo test.mp4 servo test.mp4 servo test.mp4 Edited July 31, 2023 by KenC Quote Link to comment Share on other sites More sharing options...
KenC Posted July 31, 2023 Author Share Posted July 31, 2023 Seems to me channel 6 must have been the gear channel. Slowed the servos and reversed the two . Fitted with neutral to base and servo tester ( prog 3 on Toolkit RC M7 AC) on middle pins. 1 Quote Link to comment Share on other sites More sharing options...
RottenRow Posted July 31, 2023 Share Posted July 31, 2023 It looks like one servo moves first (slower than normal), stops, then the other one moves. If that is the case, I agree, it is most likely for retracts and gear doors. Gear doors opens first, then U/C lowers. Going back the other way, U/C raised then gear doors closes. I have an Avios (HobbyKing) Sea Fury that does just that. All you need to do now is think of a use for it… Brian. 1 Quote Link to comment Share on other sites More sharing options...
KenC Posted July 31, 2023 Author Share Posted July 31, 2023 (edited) Or a buyer 😉 My only gear door is glued to the leg either side, and I can sort the slow from my DX8 PS Now you all talked me into stripping the covering I find my largest heat shrink is 1/;2 inch and too small 😞 Edited July 31, 2023 by KenC Quote Link to comment Share on other sites More sharing options...
David perry 1 Posted July 31, 2023 Share Posted July 31, 2023 5 hours ago, KenC said: Great info EarlyBird but what about the input and output pins ... before I would, as a simple high street guy , be willing to connect to these I would want to know which is input ( for receiver or servo test) and which are outputs . When the thing was sealed no one was prepared to make guesses because the 9 pins visible were similar and unmarked ! I feel that since they were never marked except perhaps in long lost instructions it doesnt matter. No damage can be done. Quote Link to comment Share on other sites More sharing options...
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