Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: Constantin

Page 1 of 10 1 2 3 4

Search: Search took 0.02 seconds.

  1. Ok, so there may be more elegant solutions to the...

    Ok, so there may be more elegant solutions to the problem, but the below worked for me. Credit goes to the arduino forums.

    Change the top portion of the Multibus example from:



    to:
  2. Issue with Dallas Temperature / One Wire library example

    Hi guys and gals,

    I found a bug in the Dallas Temperature library example and I wonder if anyone here has a suggestion how to fix it. If you have the Dallas Temperature Library, load the...
  3. Replies
    18
    Views
    4,737

    Totally agree and I would add reading up on the...

    Totally agree and I would add reading up on the hardware specs published by Freescale. The more I got into it, the more I realized just how unlikely it is that anyone gets remotely close to 16 bits...
  4. Another option is to use a RS485 transmitter on...

    Another option is to use a RS485 transmitter on one end and a RS485 receiver on the other end. Very resistant to EMI, cabling is cheap (ethernet or like twisted wire) and breakout boards are readily...
  5. Replies
    15
    Views
    2,398

    I would check the ribbon connectors carefully. My...

    I would check the ribbon connectors carefully. My guess is that one connector is put on with the correct polarity, the other one in reverse, sending power where it's not supposed to go. I would...
  6. For full duplex with RTS/CTS, you will need 4...

    For full duplex with RTS/CTS, you will need 4 pairs of wire. I would implement it with two full-duplex RS485 chips (i.e. IL83071, among many others). One chip dedicated to UART/Serial, the other to...
  7. I think of Easy Transfer as a STRUCT wrapper to...

    I think of Easy Transfer as a STRUCT wrapper to transport a variety of variables. It doesn't do anything re: CTS/RTS, you have to implement that yourself. However, I really appreciate how easy Mr....
  8. Replies
    7
    Views
    2,220

    I'm not against standing on the shoulders of...

    I'm not against standing on the shoulders of giants - I do that every time I touch a computer! However, I wanted to impress on Luis that asking Paul how to subvert his income stream is likely a...
  9. Replies
    7
    Views
    2,220

    Let me get this straight... Paul develops...

    Let me get this straight...

    Paul develops the teensy ecosystem in conjunction with Arduino.
    You are leveraging Pauls work to create a boards.txt derivative for your chip.
    Your approach...
  10. Replies
    6
    Views
    2,200

    OK, tested it tonight - the version of a DHT22 I...

    OK, tested it tonight - the version of a DHT22 I used appears to be an open-collector device - it could be powered at 4.7V (or whatever the VIN is on a Teensy 3.0) while the pullup resistor for the...
  11. Sounds like RS485 makes more sense then. There...

    Sounds like RS485 makes more sense then. There should be zero collisions on this circuit since the teensy at the cutting end will simply be sending a stream of DAQ numbers. Another option is to have...
  12. That's certainly one way to do it. However, I...

    That's certainly one way to do it. However, I wonder if you have the polarities on the power jack reversed. Most jacks are positive on the inside, GND on the outside.
  13. The answer to your question depends on two...

    The answer to your question depends on two factors: the hardware and how you are using it. On the hardware side, the answer depends on the crystal / oscillator you're using and any compensation you...
  14. All comes down to the power needed. If you need...

    All comes down to the power needed. If you need the 500mA that the MCP1825 can allegedly produce (with an ideal PCB layout and so on) then have at least 2 choices:

    1) Find a more suitable voltage...
  15. Replies
    14
    Views
    1,261

    If this was my project, I'd opto-isolate due to...

    If this was my project, I'd opto-isolate due to the damage potential. Why risk a expensive computer or two in case something goes sideways between their power supplies as described above?

    If...
  16. Replies
    14
    Views
    1,261

    If the code requirements are modest then I would...

    If the code requirements are modest then I would consider doing this project with two LC's. They are less expensive than a 3.2 and sound like they could do this project w/o issues.

    One LC would be...
  17. FWIW, I would also go down the path of the RS485...

    FWIW, I would also go down the path of the RS485 route. Shielded Cat6 cabling sounds like a good plan, i.e. 5V and GND on 3 pairs, the remaining pair using RS485. I'd go for a slew-rated RS485 like...
  18. Replies
    8
    Views
    974

    I'm glad I could help, have been helped here by...

    I'm glad I could help, have been helped here by others far more intelligent and experienced than I so many times... which is why this community is so dear to my heart.

    If I happen to see an...
  19. Replies
    24
    Views
    1,840

    Yup. The add library makes life easier, Paul has...

    Yup. The add library makes life easier, Paul has also published some examples how to read analog values.

    It might be as simple as a voltage divider and capacitor from analog input to agnd....
  20. Replies
    5
    Views
    3,261

    That's just awesome. If I ever tried that there...

    That's just awesome. If I ever tried that there would be nothing but blue smoke and tears. Congratulations for making it work!
  21. Replies
    8
    Views
    974

    I went over the schematic and see no issues with...

    I went over the schematic and see no issues with the connections between the MKL04 and the MCU. I would double-check them with a DMM (as well as to GND and 3.3V). Don't use the buzzer feature, just...
  22. Replies
    2
    Views
    450

    How about building your own? I made mine with...

    How about building your own?

    I made mine with a board from rocketscream (and there are many alternatives now), a Triac, some leftover mower parts plus a pizza oven.
  23. Replies
    8
    Views
    974

    Is there a particular reason you connected PTA6...

    Is there a particular reason you connected PTA6 on the MKL04 and PTA1 on the Teensy to GND? If USB-hosting is of interest, these wires should be attached to the ID pin of a 5-pin USB connector.
    ...
  24. I would start as follows: Hook up a Teensy 3.6...

    I would start as follows:

    Hook up a Teensy 3.6 via the differential inputs to the strain gage and see to what extent the results match reality. Especially if you can use the built in PGA as an...
  25. A 3.5 or 3.6 would certainly remove some...

    A 3.5 or 3.6 would certainly remove some constraints. DMA control of the ADC is not a trivial thing to implement. IIRC, the current ADC library doesn't...

    The best bet may be a 3.5 with onehorse...
  26. A couple of thoughts. For one, I suppose you will...

    A couple of thoughts. For one, I suppose you will have to mount the Teensy at the center of the hub in order to avoid adding a significant amount of strain on the blades, etc. from mass imbalance and...
  27. Replies
    4
    Views
    542

    AREF can be used with an ...

    AREF can be used with an analogReference(EXTERNAL) declaration for the AREF source to provide a more stable voltage, which in turn should produce more reproducible results. Pauls intent was the use...
  28. My suggestion would be a 2x4 pin header with...

    My suggestion would be a 2x4 pin header with jumpers that connect the mkl02 when you want it (with shunt jumpers) and which disconnect it when you do not. Your debugger pins are thus exposed for...
  29. Replies
    24
    Views
    2,252

    Couple of thoughts: 1) Get a good soldering...

    Couple of thoughts:

    1) Get a good soldering iron with a 'real' temperature controller, then dial it in for your particular solder.
    2) Tip tinners and coarse brass to clean same are a must
    3) Get...
  30. Replies
    16
    Views
    1,575

    The ERV project is moving forward. Tonight, I...

    The ERV project is moving forward. Tonight, I finished up the first test board and verified it's basic electrical operation. As you may recall, the Leviton motion sensors live off a 24VDC power...
  31. Replies
    16
    Views
    1,575

    Some of these optical issues are easy to...

    Some of these optical issues are easy to diagnose. The light from a visual light source should be very bright inside a house when it arrives at its destination. So bright, that the outlet will glow...
  32. Replies
    16
    Views
    2,002

    In the US, you are far better protected from...

    In the US, you are far better protected from fraud with a credit card than any other means of payment.

    if your credit card gets stolen, you have a new one in 24hrs and you are not liable for...
  33. Replies
    16
    Views
    2,002

    I don't think the fees are the issue - credit...

    I don't think the fees are the issue - credit cards siphon off 3% or more, depending on your revenue volume and so on. AMEX had a very public revolt in Boston circa 1995 when small merchants objected...
  34. Replies
    16
    Views
    2,002

    I'd investigate what reputable local distributors...

    I'd investigate what reputable local distributors are around in TW. Within a nation of ~21MM people, there ought to be enough demand for someone to have a store like sparkfun, etc that can source...
  35. Replies
    1
    Views
    529

    The circuit you're looking for is described in...

    The circuit you're looking for is described in the various application notes.

    The first question you need to answer is whether you want a isolated rig or not. MCP designs generally assume that...
  36. Replies
    18
    Views
    2,167

    Best of luck. I hope that the resistances you're...

    Best of luck. I hope that the resistances you're looking for are consistent enough from channel to channel to be useful.
  37. Replies
    16
    Views
    2,002

    Ask yourself a simple question: What is my time...

    Ask yourself a simple question: What is my time worth?

    Is dealing with even a small number of flaky IC's worth your engineering time, reputation risk, and so on?

    I'd suggest that the tiny $$$...
  38. Replies
    18
    Views
    2,167

    I don't have the means to test that. The hope is...

    I don't have the means to test that. The hope is yes. I like to give GND multiple vias from each polygon in case the board house screws up and one of them isn't connected.

    You can eliminate the...
  39. I'd try to use a glue meant for plastics....

    I'd try to use a glue meant for plastics. Anything designed for holding PVC to something else. The hot glue can be useful as a temporary scaffolding.
  40. Replies
    27
    Views
    3,573

    I used to... and then realized just how bad it...

    I used to... and then realized just how bad it is. Now I lay out everything by hand. The only decent router companion I encountered for Eagle was the external, java-based push-pull freerouting:...
  41. Replies
    18
    Views
    2,167

    FWIW, the above circuit uses a external voltage...

    FWIW, the above circuit uses a external voltage regulator, just like your layout. Note how there is a single signal on the b-plane, i.e. a little jumper under the MKL02. The rest of the board does...
  42. Replies
    18
    Views
    2,167

    FWIW, I use this crystal:...

    FWIW, I use this crystal: http://www.digikey.com/product-detail/en/ndk/NX2520SA-16.000000MHZ-W1/644-1093-1-ND

    Here is a sample layout of the chip.
    10044
    Note: VBAT and RegOut do not get...
  43. Replies
    119
    Views
    15,074

    Hey Frank, Congratulations and it's amazing what...

    Hey Frank, Congratulations and it's amazing what you could do with the 3.6.
  44. Replies
    18
    Views
    2,167

    Saw your question re the crystal and you...

    Saw your question re the crystal and you definitely violated the rules of engagement by running data lines across the crystal lines. Don't be silly. Buy the same chip as pjrc and put it in the same...
  45. Replies
    18
    Views
    2,167

    FWIW, I would change a number of things because I...

    FWIW, I would change a number of things because I am a bit retentive when it comes to PCB design.
    10030
    This is the bottom half under a custom board. Note:
    1) only one PCB trace crosses another on...
  46. Replies
    27
    Views
    3,573

    The new subscription model is a sign of the...

    The new subscription model is a sign of the times. Most every software package is transitioning to it, as developers (and owners) love the model: No longer there is any pressure to keep evolving the...
  47. Replies
    16
    Views
    1,575

    I bought mine at Amazon, see the link above. ...

    I bought mine at Amazon, see the link above. About $200. I figure it's a good investment for a project like this one where every connection is likely suspect. However, the visual tester ($20)...
  48. Replies
    16
    Views
    1,575

    Happy Ending after all. Suspecting that the...

    Happy Ending after all.

    Suspecting that the confectioning of the fiber optics by the electrician was the problem, I replaced the SC connectors in the office. All went wrong with fiber #1, it kept...
  49. Replies
    27
    Views
    3,573

    You must be German. ;) FWIW, I too am a Eagle...

    You must be German. ;)

    FWIW, I too am a Eagle user and have made peace with some of the weird quirks in Eagle. Still considering buying a full version minus the auto-router.

    I intentionally...
  50. Replies
    16
    Views
    1,575

    Anyhow, here is the current state of affairs. The...

    Anyhow, here is the current state of affairs. The TRV is back in its alcove, now I have to reconnect all the ducts, which is quite a challenge thanks to the small access hole I have to play with. I...
Results 1 to 50 of 500
Page 1 of 10 1 2 3 4