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About Acetronics

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  • Birthday 11/10/1956

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  • Location
    N/O of France
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    Planes and Boat models.<br>Electronics around ...<br>3 Cylinder Kawa Bikes
  1. Best method to measure pulse width on PIC

    Hi, Audihere I do think the best method is mainly linked to the used compiler ... and functions offered. for the input choice ... Shmitt trigger looks fine BUT it is unusable with most of Futaba receivers ( Signal high level is 2.9 to 3.2 v ... GASP ! ) So TTL input is the most compatible with ANY receiver. TO ME, the most reliable and easiest way is pin polling ( i use PicBasic Pro ) with full software pulse measurement : glitches ( obviously outside the valid values !!! ) are always identified ...by a 0 returned. But C compilers do not offer such a function ... or you have to write your own assembler function Alain
  2. Optimal Antenna Length for RC Receiver ?

    Hi, Terry The best way is to have a perfectly tuned Tx/Rx couple ... I've tuned myself all my receivers to match my Transmitter HF Heads, and the result is my eyes ( pretty good sight ... ) are the only limit. I also tried flying gliders with a pair of Binoculars ... Radio is still working fine. so ... what else to ask for ??? ... Alain
  3. Optimal Antenna Length for RC Receiver ?

    Hi, Some months ago, on another forum ... same question went up ... a Dozen Guys measured their antennas lenght for "classical" receivers ( 9 known brands - 24 models); Funny ! from 26 Mhz to 72 Mhz ... same 1 meter length @ +/- 2 cm .... No comment. Now consider amplifying the RX incoming signal will add noise more than anything else ... Alain
  4. Servo Expo using PIC

    Hi, Just found this one ... from EagleAir Australia. Alain expdiff.pdf
  5. Trying to control servos with PIC

    Hi, Did you just ask for a MkC PRO Password ??? It supports the '726 .... ( Free if you own a MkC License - otherwise 2k limited ). The PRO release also could spare some lines at compile time. But, it's you to decide ... Alain
  6. PPM channel reorder

    Hi, Loïc Just a little scoping at the trainer port output will confirm ... don't you think ??? either way, some series resistance to limit current from the Pic is a good idea ... Alain
  7. PPM channel reorder

    Hi, une fois Would this Help ??? http://lichtenberger.s.free.fr/OrdreVoies.htm Bien sûr, c'est en Wallon ... Alain
  8. step up converter?

    Hi, You can get it from here : http://www.gotronic.fr/catalog/actif/actif...regulateurs.htm bottom of page Alain
  9. RC Sequence reconstruction scheme

    Hi, Mr CAM Perfect ! It was post #35. Thank you once more. Alain
  10. Hi, Mr CAM Some times ago ( this year ), I had found a scheme with Logical circuits, the purpose was to reconstruct the serial input of RC decoders from the decoded outputs of a receiver ... YOU designed it ... I'm sure of that !!! But can't find it any more with the Forum SEARCH ... if it was ever published on this Forum. Could you give me a link to it ??? Many,many thanks Alain
  11. Hi, Jean I made a rocket Launcher for my F14 GreatPlanes, 15 years ago, with 4000 CMOS Logic. I used then 2 channels, 1 locking channel, and 1 Channel for fire ( rockets are launched " serially" ). Plus to that, I use a PCM receiver... Of course, the two channel signals must be both Ok to allow firing. Never got any misfunction that way. You also could test for a very narrow "good" signal variation AND sampling 8 to 10 incoming signals ... but that implies "auto learning" programming of the switch points. Easy to realize ( I do it for all my devices, now ... ). Alain
  12. Hi, Jean No, you can't : these false pulses can have any valid value in the 800 - 2200 µs range ... I observed it on the pulsemeter I built these days ... Th only "marker" of these false pulses is the not-steady duration. BTW this leads mes to ask you what you want to do ... as a project. ( Could be i.e. a "multi switch" device ... ). Knowing what you want to do will lead us to find how to prevent those false pulses ... Alain
  13. Hi, Jean The safer way would be to verify the signal length : must be 800 to 2200 µs. The safest would be to verify if this filtered signal keeps the same value for, say a second or two. You'd be sure this is a valid signal ( supposing another transmitter on the same channel isn't turned ON !!! ) When using those signals for commutating devices, I read the pulse 4 to 10 times to be steady as a value before switching on ... one value outside the "gap" resets the counter ... 5 to 11 "outside" lead to the failsafe stubb of the program ... Alain
  14. Capture and decode RX signal

    Hi, JF I do not want to be rude ... But you had it already done ( with 12F675 !!! and PCB draw. + parts placement ) in RC Groups Forum DIY section ... Alain
  15. How To Restore a PIC's OSCAL Value

    Hi, Mr Cam A PicBasicPro version of this utility ( for 12F6xx devices ) is also downloadable here : see : .melabs.com/resources/samples/12F675/PBP/RECOVER.BAS in the Labs X4 sample programs http://www.melabs.com/resources/samples.htm Alain