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dc812

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About dc812

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    RC-Cam Visitor
  1. dc812

    LMA @ > 100% rates

    Well, I have purchase a new Aurora 9 radio since this post, and have used the fail safe feature of the RC-CAM LMA to my advantage. On the A9, you can program the EPA of any of the channels to 140% which will set off the LM alarm. So I have the LMA on a switch so I can activate the alarm at will. Additionally, I have set the LMA channel to go to 140% during a fail-safe condition, so if I were to loose radio connect, it will still activate the alarm. These LMA are fantastic, and very versatile. Cheers! DC
  2. dc812

    LMA @ > 100% rates

    RC CAM; I notice on a LMA project that when I put the LMA on a channel that was set up with rates >100%, that I got a alarm at one end of the throws. You mention this in the speacial project instructions not to place on a channel with rate <=100%, but as always, I am curious if the value of the cap could be adjusted to expand the non-alarm range, or is it software controlled? Thanks in advance for you help and great projects....you have saved many planes from being lost! DC
  3. dc812

    LMA Enhancements

    Would the pull up resistor go from output (pin 4) to V+? DC
  4. dc812

    LMA Enhancements

    RC CAM, Well, I have struck out on the low voltage hack, and I'm not quite sure where to start the troubleshooting. I am bread boarding the project to try to get it off the ground, and I have even tried to just get the 8211 to function independently of the LMA. Here are a couple more questions that might get me going forward: 1. Looking at the MAX8211 spec sheet, it looks like output pin 4 should go high when > 1.5V is supplies to pin 3 and should provide .7mA sink when pin 3 voltage is < 1.5V. Is my interpretation correct? 2. I think part of my problem is that I don't fully understand the function of pin 2 (hysteresis). Do have a laymans explaination that a mechnical weenie like myself might understand? Thanks in advance! DC
  5. dc812

    LMA Enhancements

    Thx for the clairification. I'll give it a shot! DC
  6. dc812

    LMA Enhancements

    Mr. CAM; A couple of questions: 1. In the low voltage hack, should BAT+ be connected to the positive leg of the 4.8VDC of the male servo? 2. I noticed that there is 4.7K resistor on the signal leg of the LMA on the low voltage hack.....is that resistor only needed for the low voltage hack or has it been added for both the low voltage hack and the back LMA? Answer to these may be obvious to some, but I'm mostly a mechanical wank, and the tron stuff is makes me scratch my head a lot! Thanks for your help! DC
  7. dc812

    RCST Servo Tester Components

    RC-CAM, I ran into an interesting thing on my servo tester. I had tested it with many Hitec Servos, and it seem to operate perfectly. I had tested it on HS311's, HS81MG's, HS55's, HS325HB, HS645MG's......no problem. I plugged it into a couple of new HS81's, it worked, but the cycle motion was very course. I was able to duplicated this on two HS81's. I re-verified that all of the other servos including three new HS81MG's did not have the problem. Is it possible that different model servo's react differently to the PIC tester? Is the smoothness of the cycle motion purley a function of the pic program, or can other component effect the signal pulse timing/quality? Just curious. DC
  8. RC-CAM; Thanks upfront for providing details on so many great projects. I have successfully built and used your LMA's and my latest project is a RCST Servo tester. I have built one of your RCST projects successfully....I think. During the build process, I was unable to immediately buy two of your specified components, C1 capacitor 0.1mF / 2%, and C2 capacitor 100mF / 10V. Being a bit a.d.d., I could wait to get the project built, so I subsituted a 20% capacitor for C1, and a 16V capacitor for C2. In your build instructions you are very specific about the C1 capacitor needing to be either a 2% or 5% capacitor for "accuracy". Since I have used a lower tolerance capacitor for C1 (20% vice 2%), what about the servo tester will be less accurate...centering? Also, not being an electronic type at all, I blindly subsituted a 16V capacitor for C2 instead of a 10V....what effect doe the voltage rating of a capacitor have on this project and/or in general........ie is this type of subsitution generally ok, or is the voltage rating of a capacitor critical in most applications. Thanks in advance for your advise and generocity in providing so many great (read useful) projects. DC
  9. dc812

    LMA Enhancements

    CAM; Thanks for the quick response. I am new at this PIC stuff, but I can already forsee the great potential of using PICs. In regards to the LMA, I have a couple of questions: 1. Does the hack below use the RC-CAM LMA as a basis? 2. Are there any notes associated with the scymatic on operation and/or building? 3. Is the original RC-CAM LMA's programing open source...ie is that something that is available to be updated to include startup voltage status and operation voltage monitoring? Ultimately, I would like to design/build a LMA that is able to do the following: - Voltage check/verification with audio confirmation at startup. - Low battery warning during operation (slopers fly a long time) - Glitch count with audio confirmation - LMA w/power save - Would like all functions to be automatic, I want to avoid having to accomidate setting a jumper to check glitch count etc. This is because many slope designs bury the RX so it isn't readily accessable. Thanks in advance for any advice/guidence. R, DC
  10. dc812

    LMA Enhancements

    Has anyone considered adding an RX voltage check on startup to the RC-CAM LMA? I fly slope gliders, and I have built a couple and they work great when hunting for you plane, but would like to add an audible voltage check on startup and a audible voltage monitor to let me know that my RX battery is in good shape before I launch, and to monitor voltage and warn me if the RX battery get low. What do think, anyone added this to the LMA project. Anyone interested in helping me figure out how to add this to the programming? Let me know, could make a great project even better. DC
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