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  • Users: meBigGuy
  • In Engineering and Comp Sci Homework Help
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  1. M

    What hardware would I need to distribute a binary signal?

    Another usb-to-whatever converter is the FX2 chip from Cypress. I've used the FTDI and FX2. The software guys like the FTDI better, but the FX2 has way more IO capability and better documentation (plus an internal 8051 you can program to do custom protocols)...
  2. M

    What hardware would I need to distribute a binary signal?

    USB to gpio converter, for example https://www.adafruit.com/products/2264 The FTDI chip is pretty flexible, and you can add chips to expand the IO
  3. M

    Help designing a music visualizer for a 12x12 LED screen

    A bit Offtopic, but ... I set up a dual servo amplifier to drive the deflection coils of a TV. Equalized one channel's bass to get enough phase shift to look cool.
  4. M

    Help designing a music visualizer for a 12x12 LED screen

    You need to define what you want to visualize. Do you want the spectrum, or the time domain? Or, something else (like patterns based on frequency content) If you want the spectrum you need to digitize and run the FFT. If you want time domain, you need to digitize and decide how to trigger...
  5. M

    How to get (v1+v2)/n for odd n with minimum resistors

    You are assuming V1 and V2 are equal. Why not just put V1 and V2 in series with a 2 ohm/1 ohm divider?
  6. M

    Battery charging

    First go to wikipedia or some other site and read about charging and characteristics for the battery technology (like lead-acid, lithiun-ion, NiMH, NiCad, etc) you are intertested in. Then, proceed to ask questions about the things you don't understand.
  7. M

    Boolean expression

    In order to do a state oriented system the states and transitions must be exactly defined. For example, if you press M to shut the system off (while ABC==true), does pressing it again cause it to restart? (in other words, does M always toggle the system?). Or, do you have to go through ABC==...
  8. M

    Boolean expression

    Hold down ABC and power is applied. Hold down ABC and M and no power Don't hold down ABC and hold down M and power is applied. What ever ABC does, pressing M reverses it. IF ABC has it on, pressing M turns it off. If ABC has it off, Pressing M turns it on. Standard notation for...
  9. M

    Boolean expression

    I am designing it as a memoryless system. A simple boolean experssion is power = (ABC) ^ M. Breaking it down: IF A & B & C & ~M then power. IF (~A | ~B | ~C ) & M, then power. 4 SPDT switches in series A,B,C in series through NO with M NC. So when ABC pressed, load gets power but pressing...
  10. M

    Boolean expression

    I think M is 1 bit and needs no memory. Can be done with 4 SPDT switches or two logic gates.
  11. M

    Boolean expression

    I hate to just give you the answer. It is a cool problem. ABC tells you about the state of the system.
  12. M

    LED/Photodiode advice

    OK --- I stand corrected. learn something every day! It's leakage current changes with light like any diode. The photo current is very small in an LED because the geometry of the junction is not designed to maximize it like it is in a photo diode. But it does exist. What are you wanting...
  13. M

    LED/Photodiode advice

    An LED cannot be a photodiode. It doesn't have a "photodiode-like" mode of operation. (If that is what you were asking) BTW, In the tvilight they show a sensor unit on the pole controlling the bulb. You need to bullet list the features that you want to support. (make it up) This is a very...
  14. M

    Average value of current from graph.

    I assume you mean average value of volts. I don't see what you are talking about in the "first osc part". I just see 1 cycle of a sine wave. The average voltage of a sine wave over 1 cycle is zero. So just average everything as if the sine wave is not there.
  15. M

    Engineering A Question in Voltage in a Circuit

    NasOxy is correct. I think you need to back off to a simpler example and fully understand it first. Then the problem will make sense. There is a wikipedia page for "voltage divider" you should read and understand. For the simple voltage divider (R1 in series with R2) you calculate the total...
  16. M

    Using Multimedia Logic

    Sounds like you know what you are doing. I can be of no help with the tool. Sorry.
  17. M

    Using Multimedia Logic

    @ berkeman: I'm curious why you think this is spammy software? Looked ok to me, but I didn't install it. Designing logic with schematics is so old-school. Is it an old school? An old teacher? Aside from that, would you know how to design a cpu from scratch using Xilinx ISE? The process isn't...
  18. M

    Need help in opamp oscillator

    I'm going to let you chew on that one. Reread the responses now that you understand the basics.
  19. M

    Need help in opamp oscillator

    please explain how one gets feedback through the 6K resistor if the - pin side is connected to ground? What voltage can the opamp output that will raise ground to 1V?
  20. M

    Need help in opamp oscillator

    Nope. The op amp wants the voltage between + and - to be zero.
  21. M

    Need help in opamp oscillator

    What happens at high frequencies when the capacitor is a short.
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