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Acetronics

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Everything posted by Acetronics

  1. 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 h
  2. 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. 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. Hi, Just found this one ... from EagleAir Australia. Alain expdiff.pdf
  5. 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. 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. Hi, une fois Would this Help ??? http://lichtenberger.s.free.fr/OrdreVoies.htm Bien sûr, c'est en Wallon ... Alain
  8. Hi, You can get it from here : http://www.gotronic.fr/catalog/actif/actif...regulateurs.htm bottom of page Alain
  9. 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. 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. 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
  16. Hi, Cwd Easy Pic 4 is probably THE tool you need !!! and for first steps ...free IDEs ( C, Basic or Pascal ... you choose !!! ) available from the same factory ... Surely the most cost and use effective pack !!! Alain
  17. Hi, Mr Cam I get the same "trouble" here ... the file is automatically given a .PDF suffix ( Why is THE good question ... ) , just needed to use "save as" and choose "all" in the file Type window at bottom of download window ... Alain Program Hex reloaded here !!! AlmVoltTX.zip
  18. Hi, Save as "AlmVoltTX.HEX" ...that's all !!! For the parts numbers ... I just can give you the drawer they come from ! Seriously, there are no specific components ... just take a 25T trimpot for R6. Alain
  19. Hi, Myheliguy Here you can find scheme + Hex program for 3 LiPos Was intended for a Futaba 9C Tx ... with nominal current draw of ~ 200 mA Voltage on GP1 has to be set the closest to 4.096v ... Alain VoliPo_Tx.pdf
  20. Hi, I'm just saying : if you want to save the LiPos only 3.2 v or 3.0 v is Ok for the limit. if you want to save the liPos AND the heli or plane ... the limit has to be set to a bit more : just before the curve bends downwards ( say 3.6 v i.e.) that's quite simple !!! Alain
  21. Hi, Kilrah Some exerpt of KoKam datas : Cell voltage: 3.7V, nominal; 4.2V maximum Nominal capacity, weight and dimensions per Exhibit 1B for all cells Discharge condition: 2.5V absolute; 3V nominal Cycle life: 600 cycles at discharge rate of 2C while maintaining >80% capacity Operating temperature: charge, 0° to 45°C.; discharge. -20° to 60°C If you have a 3v limit @ 20°C ... ( whether the batt. origin ...) you just end your flight by a superb " autorotation" ... cause there's nothing more in your batteries. just suppose you were using a BEC ... ( moto glider i.e. )
  22. Hi, Kilrah 3v or 3.2v @ testing temp !!! ( generally 20- 23°C ) The problem is the voltage limit is also temp. dependant !!! figure the curves are translated down per - 20 mv/cell/°C ... What is funny is @ 0 °C ... the limiter will tell you to stop, and you only have drawn 10% or less of your batt capacity ... the goal is just to fly ... say 70 or 80 % of the batt capacity ... Alain
  23. Hi, Mr Cam I've noticed the LiPos have a not negligible tempco ( - 20 mv/cell/°C from KoKam datasheets ) what make me strongly think a voltage limiter has to be temp corrected. Summer : 25 °C ... Winter 5°C ... for a TX (3 cells ) that make : 20*20*3 = 1.2 volts difference at the same discharge level... ( say just before voltage falls quickly ) Overall ... limiter will "ring" as soon as powering up for cold weather conditions ... Some thoughts about that ??? Thanks for all of us. Alain
  24. Hi, Alastur I saw once small relays in a TO 99 or so case ... but price was "not so small" ( Swiss made ... if I remember !!! ) This one also, from Conrad.de : http://www2.produktinfo.conrad.com/datenbl...IS_A12WK12V.pdf I have here very small Old Avionics relays ... but 28 v !!! Alain
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