6 responses

  1. Jason S. aka JasonInVegas
    July 25, 2014

    Hey Bill,

    I know this series is a bit dated, but let me ask a question on performance: Can you point out some example test programs that will measure (in some standard manner) the performance throughput of the LAMP stack on a pi?

    Thanks for any insights.
    Jason

  2. Bill Sanders
    July 26, 2014

    Hi Jason,

    That’s a great question, and the closest answer I could find is at the Raspi site with responses by engineers http://www.raspberrypi.org/forums/viewtopic.php?f=36&t=60691

    As you can probably tell, I’m pretty much of a software guy and a programmer more than an IT Tech or engineer. If I can find the hooks to build a PHP program to measure LAMP throughput on a Raspi (or any other system) putting together such a program would be an ideal Raspi project.

    I’d be very interested in what you discover as well.

    Kindest regards,
    Bill

  3. LARRY
    October 4, 2014

    Sir I’m trying to hookup one of the tft monitors to my B+ RBP and having no luck with it.

    I seen your discussions on Amazon

    Thanks for any help

  4. Bill Sanders
    October 8, 2014

    Hi Larry,

    Did you see the video on how to wire up the monitor to your Raspberry Pi? If not, you can see it here:

    https://www.youtube.com/watch?v=N4JzmnQnDL0

    If you’ve seen the video of how to connect to your Raspberry Pi, be sure to see this comment–keep in mind that I’m a software guy; not a hardware guy, and the following comments come from someone who is experienced in hardware:

    “I’ve been buying new style light weight 12VDC power supplies for this kind of app.
    Design is similar to new 5VDC cell phone changers. Very light and compact.

    They don’t have a heavy transformer inside, and many have over-current and over-voltage protection.
    Most are made in China and will work off 50 or 60 Hz at 100 to 250 volts AC..
    They come in 5, 8, 9 etc and 12 volts at difference currents. Most are 1 to 1.5 amps.
    So, I always look for more amps, if I have the need. 2A cost a little more.

    I would NOT recommend that people use their old 12Volt DC wall-warts.
    You can tell they are old, because they have a heavy transformer inside.
    When you plug them into the AC outlet, they start wasting power right away,
    Heating up the transformer..
    Here’s the kicker, most of the 12VDC wall-warts have outputs of 15 to 18 volts..
    That high voltage might not be good for some 12v devices.

    The older WWs don’t have voltage regulator ICs.. And, they don’t have any over-current protection.
    If your cable shorts out, the wall-wart will try to melt down..

    They have very poor filtering and allow AC ripple out on the DC line.
    That can put a 60hz buzz in audio and video.

    Oh yeah, sometimes the transformer lamination over-heats (glue melts) and the transformer buzzes all the time..

    There’s millions of these old WWs plugged in all over the USA.. Wasting millions of watts, heating up black plastic.

    They sell them right here on Amazon. Try finding this:
    “HiMart New DC 12V 3A Switching Power Supply Adapter For 110V- 240V AC 50/60Hz 2.1mm With HiMart Robbin”

    If that doesn’t help, let me know.

    Kindest regards,
    Bill

  5. LARRY
    October 11, 2014

    Ok Bill Thank you. I seen that video once before and I found one of those DC adapters, Did a fine job lighting the monitor up.
    Although I’m running the B+ and from what I gather the 3.5 mm port has all the works in it. I have come to the conclusion that this monitor is defective.
    All I have got it to do is show me a blue Screen with a “NO SIGNAL”.
    So back to the drawing broad.
    Thanks Bill I will be checking out your site for pointers. You’re doing a fine job.

    • Bill Sanders
      October 12, 2014

      Hi Larry,

      I’ll see if I can put in more posts that include some specifics for the Raspberry Pi group of PHP programmers. Since I’m pretty much of a software guy and not a hardware one, I have to be extra careful when I venture into the hardware sphere, but with the Raspberry Pi, it’s very easy and tempting. I want to do some things with the experimental hobby boards for the Raspi and programmed control.

      Cheers,
      Bill

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