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Thread: PhantomX using a Teensy 3.1

  1. #31

    Re: PhantomX using a Teensy 3.1

    Rather amazing if you've got a really small robot and you need a decent regulator.
    I agree!

    Have you checked out the Recom? As long as you run on 2S LiPo or better, it will give you 500 mA 5V, it's < $2.50 and it's even shorter than the Pololu one. However, it is potted, so it's at least as thick as a 7805 TO-220 (actually, slightly thicker.)

    Anyway, just two or three years ago, the only options in switching regulators were big and/or expensive and I had to make a bunch of compromises (I built a few circuits around the MC34063, which requires heavy inductors.) It seems they are now popping out of everywhere, which is great! An option for every need.

    Another nice one: Naos Raptor from GE; 10A output or more, adjustable between 1.2V and 6V. Main draw-back: Max 13.8V input, so at most 3S. Not much bigger than the 78SR.

  2. Re: PhantomX using a Teensy 3.1

    Quote Originally Posted by jwatte View Post
    Have you checked out the Recom? As long as you run on 2S LiPo or better, it will give you 500 mA 5V, it's < $2.50 and it's even shorter than the Pololu one. However, it is potted, so it's at least as thick as a 7805 TO-220 (actually, slightly thicker.)

    ...

    Another nice one: Naos Raptor from GE; 10A output or more, adjustable between 1.2V and 6V. Main draw-back: Max 13.8V input, so at most 3S. Not much bigger than the 78SR.
    I haven't seen the Recom - it looks interesting, especially for the price.

    I have one of the 10 amp Naos Raptors in Roz (you can sort of see it here). I'm pulling no more than a couple amps from it, and it gets really hot to the touch, so I think you'd have to have some really good airflow/heat sinking to get 10 amps from it. Here's a better picture of it, on a custom board I did last year (the one to the right):

    Click image for larger version. 

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    The board on the left is a mini version of my old Bioloid I/O board, with a surface mount ATmega328 on it.
    "The best way to predict the future is to invent it." - Alan Kay, inventor of Smalltalk

  3. #33
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    Re: PhantomX using a Teensy 3.1

    I got a few 9.04s in today. I have a spare and will sell it to someone at cost+shipping if anyone needs one and doesn't want to deal with Robotis directly.

    Now i need to start porting my Raspberry Pi code back to Arduino land. Back and forth

  4. #34

    Re: PhantomX using a Teensy 3.1

    Yep, I finished another round playing with diptrace...

    Click image for larger version. 

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    I simplified some as I don't think I want the other pins on the bottom of the teensy to find the appropriate part to solder on the bottom of the Teensy that convert those 14SMD rectangular pads to through hole pins...

  5. #35

    Re: PhantomX using a Teensy 3.1

    I now have some soldering to do. The 3 boards arrived today from OSH Park:
    Click image for larger version. 

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    Plus I ordered two more Teensy 3.1 boards, which also arrived, as well as my order from Digi-key.
    DigiKey Part number Quantity Name Value RefDes
    1276-2742-1-ND 7 CAP_1206 0.1uf C1, C2, C3, C4, C6, C8, C14
    399-1285-1-ND 1 CAP_1206 .33uf C20
    478-1673-1-ND 1 POLCAP 10uF C16
    A26508-40-ND 2 Single row about 41 per board
    A34268-40-ND 1 Dual Row about 27 dual pins
    CD1206-S01575CT-ND 1 DIODE_1206 D1
    277-1721-ND 1 M023.5MM_LOCK J2
    WM18887-ND 4 M03PTH JAX1, JAX2, JAX3, JAX4
    160-1405-1-ND 4 LED1206 Green PWR, RSSI, RX, TX
    MPSA06RLRMGOSCT-ND 1 2N4124 Q1
    311-40.2KFRCT-ND 1 RES_1206 40K R1
    311-10.0KFRCT-ND 2 RES_1206 10K R2, R10
    311-4.64KFRCT-ND 1 RES_1206 4.66K R3
    311-1.00KFRCT-ND 4 RES_1206 1K R5, R7, R8, R9
    311-49.9FRCT-ND 1 RES_1206 50 R6
    311-150FRCT-ND 1 RES_1206 150 R4
    <NC> 2 RESISTORPTH-1/6W NC R11, R12
    102-1155-ND 1 SPEAKER SPKR
    S5751-10-ND 2 XBEE-1B2 U1
    CD1005-Z5V1CT-ND 1 DIODE-ZENERSMB 5.1v U2
    1 TEENSY_3.1_SPECIAL U4
    497-3468-1-ND 1 LD29150DT50R 5.0V U5
    MCP1700T3302EMBCT-ND 1 MCP1700_MB 3.3V U6



    Now to see how many many things I screwed up on this .1 (and maybe/probably last) version. After all this is just an experiment.

    Kurt

  6. #36
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    Re: PhantomX using a Teensy 3.1

    Nice. How are you liking Dip Trace? What made you choose it?

  7. #37

    Re: PhantomX using a Teensy 3.1

    Thanks,

    I much prefere DipTrace over Eagle. I just works more naturally for me. It reminds me of some of the CAD/CAM software packages I used to support a long time ago, when I worked at an Air Defense company.

    Both of these systems have (are at least had) free versions, that are limited in some ways, that you can use for personal (non-commercial) boards. But I have purchased a license for both systems.

    The one plus for Eagle is more people use it and as such there are more libraries of parts designed for it. However DipTrace now has some good tools for importing this into their libraries. To do so, you need to open up the library in Eagle and export to .SCR file...

  8. #38

    Re: PhantomX using a Teensy 3.1

    I have mostly assembled one board.
    Click image for larger version. 

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    The Teensy is not soldered in yet. I will remove it first and connect a battery and do a bit of testing to verify the correct voltages are where I think they should be, before I do so.

    Also I am missing the zener diode that I was adding on for protection on the AX bus. The little pieces flew out of the package yesterday and have not found them yet Luckily should function just fine without as I was running the Teensy before just with the 150 ohm resistor.

    Kurt

  9. #39
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    Re: PhantomX using a Teensy 3.1

    Nice work. That Teensy really is small isn't it?

    I played with DipTrace a bit last night and it looked good. Pretty easy to use and I like the 3D modeling aspect. Did you have 3D models for the parts on your board? I've been trying to get us to move to Altium at work so we could integrate easier with the mechanical guy's models, but the company has no interest in us doing PCB layouts, we subcontract shops to do that for us. We don't do them often enough to hire a layout guy or to develop the expertise. Anyway, looks like fun.

  10. Re: PhantomX using a Teensy 3.1

    I'll throw in my two cents - I've started using KiCad, and although it has some strangeness in the GUI department, it is quite powerful, and does end-to-end with no limitations, and also does 3D models.

    http://blog.huv.com/2014/01/custom-m...hon-board.html shows my schematic, the board layout, and the 3D view of the board that I did in KiCad.

    - Jon
    "The best way to predict the future is to invent it." - Alan Kay, inventor of Smalltalk

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