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Mr Electrical

Member Since: September 18, 2010

Country: United States

Profile

Bio

I am an electrical engineering student at Colorado State University.

Role

Student, Electrical Engineering Intern

Organizations

IEEE,

Spoken Languages

English, some Spanish

Programming Languages

C, Objective C,

Universities

Colorado State University

Expertise

Product design, steel fabrication, industrial robotics

Interests

Electronics, piano, stringed instruments, physics

  • Product SEN-12805 | last month

    The drivers have not been written, but you should be able to pair it and configure it as a serial device and read the bits and bytes using a bit of homebrew code.

  • Product SEN-12805 | last month

    As someone who deals with EMG (muscles instead of brain) and digital signal processing frequently, I can comment here -> the data is about as useable as it can be. Raw EEG data looks like scribbles of useless noise and requires a fair amount of processing to remove actual noise and get “useable” data. What is being returned to you is as useful as it can be. What they are doing is something called an FFT, or fast fourier transform, to get the data you are seeing. This is EXACTLY what you would need to do on your own in order to be able to use the data. The only thing that is missing is signal power which can be found easily by adding the squares of the four wave-type magnitudes.

    The fact that the data returned by the unit is unit-less also isn’t that big of an issue. The magnitude of the signal will change as people sweat, move the headset, or even move their facial muscles. The amount of body fat, hydration, and thickness of the dermis also change drastically between people. They COULD give you units, but they don’t mean much more than pointing into your yard from the side walk and saying “That is my favorite blade of grass.”

    If someone wants more fine grained data, they can easily make their own circuit with an instrument amplifier, a few caps, resistors, and a couple op amps and then hook it up to an ADC or a sound card. You could then read in that data, do the same FFT, and find that the data returned by the Mindwave is sufficiently fine grained and “useable”.

  • Product DEV-11280 | about 8 months ago

    A quick review: This product is a b**** to work with when trying to get it to talk to other chipsets. The I2C libraries are broken (and openly admitted by Leaf Labs) and the ones that other folks have written have major timing issues due to a poor compiler. I suppose this microcontroller would be great if you were doing things like motor control for a small robot, but anything beyond that, it is nearly useless. After about 65 hours of trying to debug this, I just gave up and bought an Arduino Due.

    The documentation is poor, the libraries are incomplete, and I would not suggest this product. Sorry.

  • Product PRT-11864 | about 10 months ago

    These are great little connectors. I used them to replace the wimpy connectors on some of my larger LiPoly batteries. They don’t come apart easily (they can actually be really hard to separate) and they carry huge amounts of current. Who could ask for more?

    A few tips with these: 1) Use flux (as in, actual flux, not just rosin core solder). The soldering contacts on deans connectors are exposed to air for extended periods of time and have oxidized making them a little difficult to solder to. 2) Use an adjustable temp soldering iron on medium high heat. You’ve got to heat up a relatively good sized chunk of metal in order to get good solder connection. 3) If you have it, use silver solder. It isn’t absolutely necessary, but it will make soldering to these a little bit easier, you’ll have a more reliable connection, and you will have less resistance in your solder joint (which is important for high current applications). 4) Cut your heat shrink perfectly square on the ends. Otherwise, you are going to have exposed conductor that could short circuit accidentally later.

  • Product COM-00306 | last year

    Just so folks are aware, you CAN use this amplifier for other purposes. A type K thermocouple creates a voltage of around 41uV/C. So, looking at the specs given, we can do some math: (41uV x Temp) x gain = Output to ADC, so we can find that the gain is going to be around 243. So, if you need an amp that is relatively noise immune and operates at about A=250V/V, then this might be useful to you. For folks looking to save a little bit of money, you can also get instrumentation amplifiers for $5ish on the low side with adjustable gains.

  • Product DEV-10070 | last year

    That’s not how Ohm/sq works. See Steamcastle’s comment above.

  • Product DEV-10070 | last year

    Odd…the data sheet you guys provided gives 5Ohm/sq…did you guys change the part and not update the description?

  • Product COM-10613 | last year

    You could definitely do that if you wanted to, but you might run into a few different issues: 1) More components mean more points of failure. 2) The resistance of a BJT changes with its temperature. Run high current through your circuit or have something warm nearby and your resistance will change as the chip heats up. 3) You have manufacturing/process variation on all components. The size of your caps/inductors, resistors, and BJT parameters change from component to component. Once you wire up your design and tune it, your tuning parameters will work ONLY for that one circuit. The only way to reduce/eliminate individual tuning is to get space grade components with extremely high process tolerances…which will end up making your replacement for the $2 chip $30+.

  • Product ROB-10555 | about a year ago

    I can’t say I’m very impressed with these. The tire itself is a very thin rubber (thinner than a bike tire tube) and is filled with foam to give it what little support it has. The hub is a brittle plastic that has been covered in a metallic coating. This tire would only work for lighter robots. For $15, it was worth a gamble, but just be aware that these things can’t handle very heavy loads.

    That said, here is a tech spec you don’t find in the description - the hub uses a 12mm hex tire mount. There are other companies that will sell 3mm and 6mm converters to fit this tire and others (at the time of this post, Sparkfun doesn’t sell these). Just google “6mm shaft to 12mm hex” and you will find what you need.

  • Product COM-10975 | about 2 years ago

    Yes, but you would need to provide a large surface (like a styrofoam plate) attached to it to capture the sound waves. You will also need a hefty amplifier to get a decent signal. A 4ohm winding probably won’t provide a large enough voltage to be read by a computer or a voice recorder.

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