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  1. Thread: VirtualWire Speed

    by THT
    Replies
    5
    Views
    2,469

    Some calculated wire lenghts for different...

    Some calculated wire lenghts for different frequencies. I use them with RFM12B and RFM69W modules quite successful:

    433 MHz: 16.5cm
    868 MHz: 8.2cm
    915 MHz: 7.8cm

    Just cut a wire this length...
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    Thanks Peter, I like your solution and will give...

    Thanks Peter, I like your solution and will give it a try.
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    20,327

    Beta12 actually broke the SPI transfers I'm doing...

    Beta12 actually broke the SPI transfers I'm doing in the RFM12B driver. Something changed here. My code has the same issue with release 1.12. Beta10 works.

    This is how I do SPI:


    ...
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    25,759

    I will as soon as I receive the PCBs. Currently...

    I will as soon as I receive the PCBs. Currently time is an issue too but I'll come back to this.
  5. It's working! Thank you Mauricio for your...

    It's working! Thank you Mauricio for your support. I had quite some problems but it looks like some stuff changed…

    I added this in my setup() to enable Timer1 (no longer using Timer2!)

    //...
  6. Thank you Mauricio So you changed this line...

    Thank you Mauricio

    So you changed this line inside mk20dx128.c?

    void pit2_isr(void) __attribute__ ((weak, alias("unused_isr")));

    Sorry to bother you again but I don't get it…...
  7. Hi, could please someone give me some more...

    Hi,

    could please someone give me some more hints about how to use this in the Arduino IDE? I've added these code snippets to my Sketch but it won't work. Do I have to change something else?
    ...
  8. Replies
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    25,759

    I ordered some PCBs yesterday to build a RFM12B...

    I ordered some PCBs yesterday to build a RFM12B wireless to Ethernet bridge. There is also a 3.3V regulator included as I'm clearly above the 100mA. The board is 5x5cm but I love your idea to put the...
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    25,759

    Sorry to bring back this old topic but if you're...

    Sorry to bring back this old topic but if you're looking for something more embedded, check out these beautiful modules: http://www.wiznet.co.kr/WIZ820io
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    9,191

    Still one more question… I cut this small...

    Still one more question…

    I cut this small conenction to split Vin from Vusb and attached an external regulator to get more current on 3.3V. Now how do I correctly power the Teensy3? Vin is...
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    It's hard to tell… I found this interesting link...

    It's hard to tell… I found this interesting link here: http://www.ladyada.net/make/mintyboost/icharge.html . Looks like it's possible for chargers to tell the device how much power it's able to...
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    Chapter 41 is an interesting read but is it worth...

    Chapter 41 is an interesting read but is it worth the trouble? Looks like I'm trying to do more than needed and I should go back a step or two.

    As I only connect to a PC for debugging purposes...
  13. Ok, I took it the easy (or was this one called...

    Ok, I took it the easy (or was this one called the "hard") way. I just took the Arduino Ethernet library and rewrote it for the W5200 commands.

    Just download T3Libs to your...
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    Any chance to get 500mA from USB?

    A normal USB port supplies 100mA @5V but I need more. Most ports happily give 500mA but to do it right you have to inform the USB host first. My device (a RFM12B Wireless to Ethernet Bridge) should...
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    Thank you cmason. It works well for me. I removed...

    Thank you cmason. It works well for me. I removed the C++ stuff and made a small Ardiono Sketch (see attachment).
  16. Anyone working on a WIZ820io (WIZnet W5200) library for T3

    Hi,

    What's the current state? Is there a library somewhere or someone working on it?

    Merry X-Mas everyone!
  17. Thread: CRC algorithm

    by THT
    Replies
    8
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    4,630

    Using the hardware CRC unit is quite easy as soon...

    Using the hardware CRC unit is quite easy as soon as you've enable the CRC clock and use the correct data types in the CRC macros. I'm the one who asked the question in the already referenced forum...
  18. Thread: T3 - Multiple SPI?

    by THT
    Replies
    8
    Views
    6,028

    There's more (as always...) CLK/DIN/DOUT are...

    There's more (as always...)

    CLK/DIN/DOUT are fixed as they are driven by hardware. But the CS pin is not time critical so you could use digitalWrite([port], LOW) to select a device and HIGH to...
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    Thank you Avenue 33! The Arduino IDE works...

    Thank you Avenue 33!

    The Arduino IDE works great for very small stuff but is IMHO completely useless on bigger projects. Looking forward to play around using embedXcode.
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