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MrMark

Member Since: April 25, 2010

Country: United States

Profile

Bio

I am a student at the egl academy in wisconsin.

Spoken Languages

english, bad german

Programming Languages

a little bit of C++ (Arduino)

Associations

first robotics, diydrones.com

Expertise

hardware, electronics amd mechanics in general

Interests

UAV’s, first robotics, tesla coil’s

  • News - Enginursday: Yeah, I foun… | about 2 months ago

    Since you seem to be going exotic and expensive, why not replace the engine in a pruis / hybrid electric vehicle system with this? It’s basically perfect. The electric motor provides the burst power, while the turbine provides a constant source (They don’t like operating very much outside of their specified rpm’s) of regenerative power for long periods when needed. You could even build a sparkfun boat with this setup if wanted. (I’m currently trying to convince a relative that this is a good setup for an experimental semi truck)

    There’s a reason that you don’t typically see turbines used outside aviation (high power/weight ratio), power generation, and ….and…. I got nothing else.

  • Tutorial - BMP180 Barometric Pressure Sensor Hookup | about 2 months ago

    I’m having the same problem. I tried it with arduino 1.0.3 as well and it pulled the same error. While I’m getting better at arduino, I’m still at the “modify example code and see what happens” stage so I have no idea what would be causing this error or what it means.

    EDIT: Nevermind, I got it to work. I just unzipped the file and dumped it in the library folder. On closer inspection, the unzipped file isn’t the library folder and contains basically every bit of documentation for this board, including the library. I moved the library where it belonged and it compiled just fine.

  • Product WRL-12030 | about 2 months ago

    Ah, Thanks for the tip. It will probably be simpler to design just a RFM22 version of the boards as well as the RFM12 Band RFM22 have different footprints. Unfortunately this means these modules are too expensive for me to purchase from Sparkfun. Fortunately they are available other places for around $6 - Just search for “RFM22” on Google or Ebay

  • Product COM-12723 | about 2 months ago

    Ok, but aren’t pizo speakers usually minimally flexible and brittle? What is being done here to make it flexible? Oh, and how much of a bend will it tolerate? Will folding it back upon itself cause it to fail? (open one up?)

  • Product WRL-12030 | about 2 months ago

    If this transceiver was on the same frequency range (915Mhz), could it communicate with the RFM12B with little or no differencre from communicating with it’s “own kind” - or vise versa?

    I am wondering because I have some sensors in a sensor network that could use the shorter range rfm12b, but others that need the longer range rfm22b (Which is twice as expensive and something that I would like to avoid using on every single board if possible)

    If anyone can help / point me in the right direction, Thanks

  • Product WRL-12031 | about 2 months ago

    If this transceiver was on the same frequency range (915Mhz), could it communicate with the RFM22B with little or no differencre from communicating with it’s “own kind” - or vise versa?

    I am wondering because I have some sensors in a sensor network that could use the shorter range rfm12b, but others that need the longer range rfm22b (Which is twice as expensive and something that I would like to avoid using on all the boards if possible)

    If anyone can help / point me in the right direction, Thanks

  • Product COM-12723 | about 2 months ago

    So would this be a form of the electrostatic speaker? or does it operate in a different way? You never say what the operation is, something that would probably be important for comparison and use.

  • Product SEN-11999 | about 3 months ago

    That… is actually a really good idea. as this is spring steel (I’m guessing) it will be really hard to curl the ends once you have it. If sparkfun could do this (if not for eyes, then to avoid poking ankles and walls when the bot is running around) it would be quite awesomer than the current product as it is. (yes, I just made up that word)

  • Product COM-11289 | about 9 months ago

    These pads will draw 0.7A at 5v for 3.5 watts and about 7.14 ohms. At these ratings with a 23C ambient temp, this pad will reach ~70C. I cant remember exactly what the equation, but the temp is proportional to the power input minus the power dissipation, which is exponential/related to the surface area of the pad and the ambient temp/heat resistance of the surrounding medium. if you can get these variables and find the equation (try something like “calculating power dissipation” on Google), you should be able to get data-points for current (and because this is restive, voltage)/ temp at at specific ambient temperatures to air.

  • Product COM-11821 | about 10 months ago

    Very nice product. Saw them being built into boards and led strops and couldn’t wait to get my hands on a couple. Although it might be a little hard to use them if the datasheet link leads to a “404 not found” page. Also, I think when you said “…a WS2811 control IC build right into the…” you may have meant “…a WS2811 control IC built right into the…”. You may want to fix these errors. Otherwise I look forward to buying some and trying them out!

Name Pieces Total
cylinder tester
5 108.3
Christmas ideas
the USB cables, and screwdriver kit are at the top of th…
5 96.75
diy 3d printer
9 108.1