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  1. Minder

    Variable speed water pump controller

    That is fine if there is already a head of water above the pump intake, if you were trying to lift then it probably would need priming. M.
  2. Minder

    Variable speed water pump controller

    IF it capable of being non-submerged, you will need to prime it first for it to operate. M.
  3. Minder

    Help with sensing a stopped sprocket

    Unfortunately the Pickit 2 does not support the later 12F and other recent Pic's. I am using Pickit 3. Also Picmicro has the older MPLB IDE program or the latest one MPLABX as a programming environment. I personally am still using the IDE as I did not get on that well with the later ver. Both...
  4. Minder

    Variable speed water pump controller

    It appears it may be a ECM motor, Electronically Comutated (BLDC) Motor, if so the electronics are internal. Use a variable valve on the output. M.
  5. Minder

    Help with sensing a stopped sprocket

    I have to use it because it only supports the latest chips, but it is a shame they dumped some features the Pickit 2 had. M.
  6. Minder

    Help with sensing a stopped sprocket

    Here is an amusing review. If you haven't seen it already. M.
  7. Minder

    Help with sensing a stopped sprocket

    Do you have means of programming the 12F? also what are you using for S/W, MPLB IDE or MPLBX? M.
  8. Minder

    Help with sensing a stopped sprocket

    The pin out is the same for many of the 12f series, AFAIK. I use Kicad but it should be easy to copy one of the other 8pin pics and change the number? M.
  9. Minder

    Help with sensing a stopped sprocket

    OK, had some success today. Which ever design you want to go with, also you can interface the Prox with a opto or use Chris's method. Using the 2n7000 to drive the relay usually eliminates the base resistor. see PDF for the original '80's spec sheet. (ignore the 55c)! M.
  10. Minder

    Help with sensing a stopped sprocket

    Actually they have used the Industry standard for prox sensors, used by just about every major manuf. of them now. I was considering using the open collector out too instead of the opto, but it depends how much leakage through the output, it might be wise to clamp it off with a 5v zener. Also...
  11. Minder

    Help with sensing a stopped sprocket

    22uf not critical . chris, see last line of #185;) M.
  12. Minder

    Help with sensing a stopped sprocket

    I have had fairly good success, I had the timer set for the limit of 1sec for testing, just having a little problem with shortening it with a preload. It can't be anything that great to overcome. If it works as I imagine, all you would need to do is change the timer H & L value and re-compile...
  13. Minder

    Help with sensing a stopped sprocket

    I had some time today to get back to it and seem to have had some success with the 12f μp. It is a very short program that virtually simulates the 555/556circuit, only performed in S/W. IOW a missing pulse detector, and should only switch if two adjacent sprockets are not seen in the correct...
  14. Minder

    Can a commutator be made to produce dc current turning in both directions?

    It does, if referring to a DC motor/generator. If wishing to maintain a certain polarity regardless of direction, then a simple bridge rectifier on the output will do it. M.
  15. Minder

    Help with sensing a stopped sprocket

    I think they are all the same, just the package style is the difference. Look them up on the Digikey site, this is where I get my parts from. M.
  16. Minder

    Need motor specification

    You may have to do some empirical tests, run it on low voltage DC and check rpm and current. Probably a small PWM controller would run it. Unless specially designed, the rpm is commonly around 3krpm. RPM is proportional to voltage. M.
  17. Minder

    Help with sensing a stopped sprocket

    It's a bit like having a timer that clocks one sprocket to the next for time, anything above the minimum can be ignored, if at the minimum or below, stop. M.
  18. Minder

    Need motor specification

    What motor technology? Universal, DC, Induction? A photo would help with an indicated physical size. M.
  19. Minder

    Help with sensing a stopped sprocket

    Just an update on the method I am aiming for, is to run a timer driven from a 32Khz internal clock, 32.768Khz for 1 sec is represented by 15 bits (7FFFh), so essentially this means that the Timer can be set to roll over at 1 sec, or any period up to then with the range of the 15 bit value. So...
  20. Minder

    Help with sensing a stopped sprocket

    Anything above the lower rpm limit does not matter, it only 'see's' or is concerned with the absolute minimum, if it see that or anything at all below that, it issues the stop.The timing sensitivity is one sprocket interval to the next. So IOW 1/5 sec is the lowest set limit. although that will...
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