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Member Since: May 23, 2008

Country: United States

  • But I wanted the Extreme Longitudinal Copulation Device! (At least it's male-to-female - no gender bender Male-male or female-female (or PC-PC) connnections...)
    Really! all this and no Infinite Improbablity Drive? If Doug Adams can, why not Sparkfun?

  • I have a project using the Logomatic, a Li-Po battery and the Analog Devices ADXL 16227 (http://www.analog.com/en/mems-sensors/inertial-sensors/adis16227/products/product.html) to measure and record Vibration spectra.
    In the process, I will be using the RTC to log the GMT when the accelerometer starts. In order to do this, I need the proper UTC from the PC OS to initialize the RTC. IF I understand the bootloader properly, the 'main_msc' command initializes the USB for mass storage control by placing the USB into slave mode on the LPC 2148. Is this correct and is it possible to insert another command to initialize the USB as a device first, then read UTC data transferred from the Host PC before involking 'main_msc"?
    Or would I be better off not using the bulk transfer of 'main_msc' and writing code to use the DMA to transfer to the SD Card?
    I hope you guys don't mind my trivial questions...

  • Look more on the web...seems Honeywell is using ST Micro's production facilities for the HMC5883. I presume there was some IP sharing, so the LSM303 is probably functionally the same as the HMC 5883. I suspect, however, the ST Micro chip will be less cost, as ST Micro has consistently gone for the high volume applications.http://edageek.com/2010/01/08/honeywell-hmc5883-sensor/
    If you want to drool over another Magneto/ Accelerometer, check out Freescale's MAG3110 upcoming offering - http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MAG3110

  • FTDI makes another USB host/device chip, the Vinculum VNC1L. Like the FT232R, it has additional I/O lines which are available to the user - but how to access these is poorly documented.
    Wonder if the same bit-bang techniques could be used?
    The advantage of the Vinculum is built in FAT support and USB host ability (in one firmware configuration, one of the two USB controllers can be a device (slave) while the other is host). This could become an extremely small datalogger if set up properly.
    Unfortunately, the FTDI webstore lists the Vinculum at GBP 8.25, or about USD 14.35 for the bare chip, which dorsn't make it much less expensive than a LPC2148 or LPC2388, which can handle much more and are well supported with IDE's and RTOS's.

  • I'm just a simple Mech Eng who dabbles in controls, so take what I think with a grain of salt...I see 4 identical circuits in the upper left corner, with a common connect at 'pin 1.' 'Pin 5' looks like a common rail - Vcc or Vss. Same with that extra pin to nowhere - I would suspect that's a ground pin into a shield or something under the die.
    I would guess this is a type of comparator or quad switch/gate/logic device - probably high volume, low cost (note alot of ON's switches/gates are $0.11 - $0.25 in bulk!) Good way to make bucks, if you can sell them as $2-3 MCU's!

  • All of the comments are interesting with regards to the whole uselessness of the project. I foresee the simplest contestant being the line-following walking robot on a table which cannot follow any line (except the straight one over the edge of the table).
    Simple, elegant self-destruction. Meets all the competition requirements.
    Maybe I will enter this - it's about at my level of programming...

  • I've had the same problem with info for their accelerometer. I think, so far, it's just a prototype and they're working the 'bugs' out. Meanwhile, try the Analog Device's ADXL345 if you want digital tiaxial accelerometer in a small package for just a small $$. AD has let me try one for free with an eval board (someday they'll ask for it back, I'm sure) & it's a little marvel.
    While I'm on the subject of AD, they have complete 6 DOF (one with a compass, too) modules which are 10 x 10 x 10 mm -but also $350-450 in quantity. Still lower than alot of other integrated IMU's, but beyond the tinker's price range.

  • frank36080115, I'm a bit confused about your comment, too. For triaxial accelerometers, gravity acts in the Z-axis - the MEMs technology should take care of that orthogonally for the other axes. As far as aligning an X-axis accleration with a Y-axis rotation, that doesn't apply to the relative acceleration acting on the rate sensor - that would be nulled out internally. For the user, aligning the axes would make more sense (even if its aligned in opposite directions) for the resolution of motion.
    By the way, I am curious why the invensense gyros were not chosen for this board - the IDG-500 and ISZ-500 have better resolution than the ST gyros with the same 4X gain circuitry and the single z-axis sensor is cheaper than throwing away the Y=axis of the LY530 sensor.

No public wish lists :(