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SparkFun will be closed Monday 7/4 for the holiday. All orders placed after 2pm MT on Friday 7/1 will be shipped out next week.

Member #344403

Member Since: August 9, 2012

Country: United States

  • Judging from the limitations noted by the commentators below, the sensor sounds like it’s intended for use as some sort of toy, not for professional measurement applications. I haven’t looked yet, but maybe there are higher quality models out there. Probably more expensive, though.

  • Would sensitivity and dynamic range improve if the sensor were employed as one leg of a bridge circuit, with variable resistor on the opposite leg? The latter can be used to set the zero-point resistance. Can’t we improve the sensitivity and range even more by connecting a differential op-amp with high common-mode rejection (i.e., so-called ‘instrumentation amp’ ) between the 2 legs of the circuit ? This is a common way of measuring other commonly used resistive sensors. Of course, you eventually will run into the sensor’s absolute lower limits of sensitivity, accuracy and noise.

  • The newbiehack video says you will get from 25kOhms to “as much as” 125kOhms. Yet another example of sly ad copy.

  • Not according to the Newbiehack video tutorial. It only changes resistance when flexed in one direction.

  • I have read that current mirrors are commonly used in op-amp circuits, I’m a newbie, so I don’t know why. Can anyone explain this? Would such a design work for discrete linear amps?

  • What does it mean, in practice, that the PCduino supports Linux and Ubuntu? Does it require that you use a Linux flavor OS in the computer with which you program it? Do you need to know Linux features in order to program and use the board? Or is the embedded OS transparent?

  • So, I take it the mbed DIP is the development board? And you plug it into the application board (the other mbed product you sell) to get access to the peripherals on the latter?

  • Chip Quik sells a tin+bismuth paste with a very low m.p. See CN Lohr’s you tube vids about this. With this stuff, he solders his boards over a 250W halogen work lamp, or uses a hot-air gun.

  • It strikes me that this might make a decent display for a DIY oscilloscope. 400 pixels vertical is ample, compared with most low-cost ‘scopes on the market, which are 8-bit precise in voltage. With the extra ~140 pixels, you could have some extra headroom for dual-trace, perhaps. But I don’t know yet how this screen is refreshed, and how fast. Is the entire display refreshed at regular intervals? Or, alternatively, does every pixel remain lit until it is individually addressed and turned off, the opposite for turning on a pixel? Any thoughts?

  • What is up with Bildr? To register, they require a question answer that I’ll bet most people don’t know off the top of their heads. I looked it up in Wiki. When I returned to their registration site, I was told that I had attempted to register too many times and had to wait. I waited 15 mins, and they still won’t accept my registration. Not only that their is no “contact” service, so I can’t ask them for help. Apparently, they don’t want members. SO, will you please drop them and find some other place to put tutorials?

No public wish lists :(