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  1. Herschel Peeler

    Microsoft excel

    I use it for inventory and other purposes. To record data in electronics exercises and create a graph of the results. As a design aid, I set up a spreadsheet with component design procedures. I don't think I can post Excel files here but I can post pdf views of the files if you were interested...
  2. Herschel Peeler

    Reducing amps in a circuit without change in the voltage

    Generally true but we don't know what kind he has.
  3. Herschel Peeler

    Help with code.

    14M2? M3851 14M2 microcontroller? Can you point me to a data sheet for this chip? What I find is a 42-pin chip.
  4. Herschel Peeler

    Temperature

    It would be helpful if we knew what your present circuit looked like.
  5. Herschel Peeler

    How calculator Work

    The type of chip and the procedures depends on the calculator.
  6. Herschel Peeler

    Reducing amps in a circuit without change in the voltage

    Correct but not the complete picture. On an unregulated supply rated at 12 V at 1 Amp, if you draw less current the output voltage will be higher. It may not be enough to make a difference, but just be aware of the possibility. Regulated supplies you are fine, The voltage does not change at...
  7. Herschel Peeler

    12V Rechargeble Fan Circuit Problem

    Quite suitable. Get a couple of them. A lot of learning exercises are easier using more than one meter.
  8. Herschel Peeler

    Hello from Belgium

    LED grow lights are pretty popular and cheaper to operate than other options. So how much light do you need per plant? Water control is no problem. Fertilizer and pollination is best done manually. What kind of pot are you interested in growing? :) Seedlings take different lighting requirements...
  9. Herschel Peeler

    Circuit design help needed

    Over engineering? Possibly. I was considering simplicity of manufacturing and of design alterations in the future. CMOS was my first consideration. Blinking once per second, twice, four and eight times per second would be easy. OP hasn't specified what frequencies he wants. He mentions another...
  10. Herschel Peeler

    Code needed for PIC16F684 to control LED's

    So we have three switches, pushbutton? We have one output that drivers 5 LEDs? what kind. What does the blinking indicate? We have an analog input to monitor battery voltage? We have an LED output to indicate that the battery is charging? We have an LED to indicate the charging is complete? We...
  11. Herschel Peeler

    Code needed for PIC16F684 to control LED's

    Before anyone can help we need specifics of the overall operation. LEDs blink at any specific frequencies?
  12. Herschel Peeler

    Code needed for PIC16F684 to control LED's

    This might help. http://www.winpicprog.co.uk/pic_tutorial.htm
  13. Herschel Peeler

    Circuit design help needed

    Looking at the forums I go to nobody wants the job. The job of programming for another party that isn't specific about their needs makes for a potential unhappy customer. You are looking at small bucks to get into doing it yourself versus thousands of dollars US to pay somebody else to do it and...
  14. Herschel Peeler

    Circuit design help needed

    330M0129 from Mantech. About R 2,000 ($135. US). comes with a PIC16F690, which is quite suitable to your needs. A great learning experience awaits you. Or you can go to a handful of ICs and headaches. :-)
  15. Herschel Peeler

    Circuit design help needed

    You might find somebody here or other forums that might do it for a fee. You don't have a programmer yourself? I don't know Mantech But the chip is pretty common at a similar price. (edited to add ...) Yes, Mantech has the chip at R15.15 (a bit over $!.00 US. I didn't check but they probably...
  16. Herschel Peeler

    Circuit design help needed

    For mass production Arduino may not be a first choice. PIC16xxx might be better. Do you have devices in stock? What sources do you usually buy from? US market? http://www.jameco.com/Jameco/Products/ProdDS/312590MCH.pdf If the link works, PIC16F684, cost about $1.55 in small quantities. 12...
  17. Herschel Peeler

    Old School and stuck on component ID

    A part number off the LED might be helpful in determining a replacement.
  18. Herschel Peeler

    12V Rechargeble Fan Circuit Problem

    You are not in the continental United States? Is a cheap meter available where you are? Pay as little as possible. Your needs are not major. US$10.00 or so.
  19. Herschel Peeler

    Circuit design help needed

    Do you have a preference for a microcontroller. All lines are simple digital. A cheap PIC16 or Arduino?? For mass production or just a one time thing?
  20. Herschel Peeler

    Timer with NE555

    The timing isn't so much of a problem. The high current driving may be more of a problem. What model washer? Do you have a wiring diagram? Can you handle a microcontroller solution?
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