Search results

Search Forums New Posts
  1. CDRIVE

    low fuel light circuit

    This should work but you're working with fuel. Proceed cautiously! Edit: Schematic was removed, updated and reposted later in this thread.
  2. CDRIVE

    Digital Pot setup

    Justin, I just read your motor controller pdf again. Nowhere does it state that 0 Volts on the speed control pin equates to zero RPM. It may but it doesn't specify it. Your controller provides a Run/Stop input for this. You have spare pins left on the Picaxe. If you want the motor stopped...
  3. CDRIVE

    Digital Pot setup

    Justin, most of is like to low side switch, which is how the Led is wired, as Bob explained. As far as your concern about 20mV; you should have a separate On/Off switch connected in line with the battery anyway. Your motor controller and the Picaxe circuit will always be drawing current without...
  4. CDRIVE

    low fuel light circuit

    How are your soldering skills?... Welding experience doesn't count! :D I'll sketch up some circuits. Chris
  5. CDRIVE

    Digital Pot setup

    Justin, I wouldn't work up a sweat over 20mV. It's fairly insignificant value in this application. By the way, did you find a wallwart to power the protoboard. Anything from 8VDC to 18VDC will work with the integral 7805 regulator on your protoboard. An 8 to 9V wallwart is about perfect though...
  6. CDRIVE

    Digital Pot setup

    That's very good info. Makes more sense than a charge pump too. Where did you find it? Thanks, Chris
  7. CDRIVE

    Digital Pot setup

    Bob, that's true if the Pin is designated as a Digital Output. The DAC is another story though. From the literature, which is vague on the particulars, I'm guessing that the DAC functions like a 'Charge Pump' circuit. This would explain the need for a HiZ load shunted by a 100nF cap. Admittedly...
  8. CDRIVE

    Digital Pot setup

    Yes, that's why I asked you earlier what the voltage control input impedance of your motor controller is. You said 1Meg, so buffering should not be needed here. Have you ran the code in the simulator? Do you know what to do when the simulator starts? Do you know how to executed a button...
  9. CDRIVE

    Digital Pot setup

    Justin, 'DacSetup' is a Pin configuration Function. It's prefixed with a % Operator which specifies it as a Binary number. It is explained in the help file named "Basic Commands". File name is "picaxe_manual2.pdf". Do you own a DVM, VOM or VTVM? Chris
  10. CDRIVE

    A Digital Counter

    Fish de-bouncing. That's too funny! :D Chris
  11. CDRIVE

    Digital Pot setup

    Justin I'm really tired but I wanted to post this before hitting the sack. I'll explain why I changed the PBS logic in the morning. Copy & Paste this code into your editor. It will format correctly when pasted. Don't attempt to create straight left hand alignment. Chris ' Title: DAC...
  12. CDRIVE

    low fuel light circuit

    There are quite a few variations of a Schmitt Trigger but they all serve the same purpose. http://images.search.yahoo.com/search/images?_adv_prop=image&fr=yfp-t-701-s&va=schmitt+trigger http://pcbheaven.com/wikipages/The_Schmitt_Trigger/ While a common electromechanical relay is not a...
  13. CDRIVE

    A Digital Counter

    I've given this more thought and I'm thinking that the two most reliable methods would be two photoelectric gates. The first beam broken would set a flag that waits for the second beam to be broken. Only then would a count be generated. My second proposal is simpler. The phototransistor...
  14. CDRIVE

    Digital Pot setup

    I promised the wife a bike ride to our local wildlife preserve. Talk to you when I get back. Chris PS. Your program is already written. :D
  15. CDRIVE

    Digital Pot setup

    Justin, any progress learning how to use the software? Chris
  16. CDRIVE

    low fuel light circuit

    I'd like to say it helps but I'm afraid not. I don't suppose there's a schematic for that board?
  17. CDRIVE

    low fuel light circuit

    Take a look at the indicator on the original dashboard. My guess is that the indicator isn't just a simple lamp. Odds are it includes a Schmitt Trigger or Comparator circuit, but at this point I'm just guessing. Take a look at it and tell us how many connections it has. By the way, I'm...
  18. CDRIVE

    low fuel light circuit

    So, you originally didn't have a gage + fuel low light, just the light? Did you toss the original dashboard?
  19. CDRIVE

    low fuel light circuit

    Is your fuel gage wired like this?
  20. CDRIVE

    -12v pulse???

    Is there any particular reason that you want to generate a pulse with a relay? It's, by far, not a good choice.
Top