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bsilva

Member Since: December 29, 2007

Country: United States

  • Just checked this. With 0V input on the OpAmp, I’m getting .002V output from the LM358.

  • I’m using the LM358 to raise the voltage output from a DAC connected to a Pi. The DAC has a max output of 3.3V (makes sense) and I’m using the LM358 to raise this to 10V for an LED control system. As Mike mentions, you do need a separate supply for the LM358 that is a couple of volts above your target voltage.

  • Hmm… I’d check for leakage, or maybe you got a bad part. In my current circuit, I have a low output of .14V and my input isn’t quite 0V.

  • A couple of issues: 1) The learn website (http://kit.microview.io/) won’t let you view it unless you give it the email address you used as a Kickstarter backer. I’m not one. 2) Really needs more documentation. I’ve looked at a half dozen tutorials and web pages and I haven’t been able to find the physical and display dimensions. Just a regular spec sheet and list of features, please! If there is one somewhere, great! I wasn’t able to find it in 20 minutes of poking around. Maybe one exists and I just didn’t dig hard enough. Preferably, it would be listed in the documents section of the product page on the SparkFun website.

    Thanks, Brad

  • Found it. If you go to “Startup Guides” in the Documents links on the SparkFun product page, look for a document called “pifacedigitaldatasheet.pdf”

    Brad

  • Is there hardware documentation available anywhere?

    Couldn’t find any on the PiFace website.

    Thanks, Brad

  • Whoops, in trimming it down to 1150 characters, I dropped the part that says this is an open letter to Sparc International. I emailed it to them earlier today.
    Brad

  • I’m a long time Solaris Admin and systems engineer. I’ve been using Sparc processor based systems since Sun switched to them from the Motorola processors. I’ve also worked with embedded systems using the Sparc processor.
    .
    . (arguments deleted because I can only put 1150 characters in a comment)
    . (full letter at: http://www.sonic.net/~bsilva/)
    .
    I highly recommend you cease this campaign. The only way you could possibly win would be by using the courts to overwhelm the much smaller company and I doubt highly that you have the sales in this economy to justify such an effort. Without such an overwhelming legal effort, the only possible net result of your efforts will be to further damage the Sparc name and to cost a small company funds that they would rather use for growth.
    Furthermore, if you somehow succeed in this effort, I will make sure to dump every Sparc processor I own and will do my best to make sure my fellow SysAdmins do the same.
    Very Sincerely,
    Brad Silva
    cc: every message board that seems halfway reasonable.

No public wish lists :(