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Recent content by wassabi

  1. W

    need help for sensor code

    Is the sensor analog or digital? I find analog easier to write for. In a loop, start ADC and get a sample of each XYZ. IF statement to compare sample to greater / less than constant number threshold which turns on LED, ELSE turns off LED.
  2. W

    2AA Batteries and one supercap cell

    There are many types of regulators. I know that method works with transformer / rectifiers from generators. I can't say if a normal regulator that uses a resister network would "go crazy", you would think that it would continue to adjust. If it was me, I would slap one together and take some...
  3. W

    Graph of capacitor voltage

    Capacitors will pass current while charging. They can be used to sort AC and DC signals. Caps allow AC through but not DC.
  4. W

    Partial Derivatives with many variables

    Can't help ya much there. When I don't have a calculator or matlab available, I used to use a integration/derivative lookup book. It's been so long I can't remember the name, but what the book had was page after page of complex polynomial equations and their equivalent simplified form. Making...
  5. W

    Mixing battery pack technologies

    There are a few different methods of voltage regulation. Most common use an integrated circuit with an input, output, and ground. Current only flows one way. Another type would be simply placing a zener diode in parallel with the batteries. Neither battery could exert a voltage greater than...
  6. W

    Choosing a dc step-up type for solenoid

    I think I made a decision. I am leaning toward a Step-Up (Boost), FlyBack, Sepic. SEPIC converters are readily available, provide me with the voltage boost I want, and can even handle currents up to 5A.
  7. W

    solve equations help.

    Wolframalpa can do that https://www.wolframalpha.com/input/?i=x*y*z%3Da%2C+x%2By%2Bz%3Db%2C+x*y%2Bx*z%2By*z%3Dc+ Copied from the Alternate forms section a = x y z b = x+y+z c = x (y+z)+y z
  8. W

    Mixing battery pack technologies

    Yes, different voltages will put stress on the lower cell. Is this stress enough to destroy the battery? Probably too expensive to test and find out. Recommend two voltage regulators, one for each battery. Does the bike motor need a constant current flow? Probably not. The easiest solution...
  9. W

    Graph of capacitor voltage

    Rephrasing: the current passing through R will decrease as C approaches 100% charge. The Vdrop across R then approaches but never actually hits zero.
  10. W

    Graph of capacitor voltage

    Because the current passing through R results in a voltage drop across R. 9V - VdropR = Vcap t in seconds C in uF R in ohms V in volts R*C is in seconds For the rest, I think this page will be of help to you. http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/capchg.html#c2
  11. W

    Partial Derivatives with many variables

    I just got this link from a friend. Give 'er a shot. https://www.mathworks.com/products/matlab/tryit.html
  12. W

    What is the transparent mode in SIM300 module?

    transparent mode I think transparent mode is what it is called when the data is passed directly by the module with no processing.
  13. W

    Measure Inductance of three phase motor

    The procedure detailed here looks solid. https://www.control.com/thread/1250410776
  14. W

    Need Help On the ATmega32

    Yep, you disable the JTag by setting the fuses. Any comm software for the mkii can do this. JTag is enabled by default on most atmega chips, need to disable it to use those I/O pins for something else.
  15. W

    Partial Derivatives with many variables

    Depends. Do you have a good calculator, or access to matlab?

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