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Thread: Teensy 3 vs. Teensy 2 power consumption

  1. #1

    Teensy 3 vs. Teensy 2 power consumption

    How does the power consumption of the Teensy 3 compare to Teensy 2 at rated clock speed?

    Since there's little difference in price but a large difference in speed I wonder if it makes sense to move over to Teensy 3 for all my projects, Even if they don't need the computational power of a 32-bit ARM processor.

    Power consumption could be a distinguishing factor to still pick Teensy 2, however, the reason for me asking.
    Last edited by bigpilot; 10-09-2013 at 12:20 PM.

  2. #2
    Senior Member PaulStoffregen's Avatar
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    The power usage is pretty similar in the default configurations.

    Here is a page with info about Teensy2 power usage.

    http://www.pjrc.com/teensy/low_power.html

    So far, I haven't repeated this for Teeensy3. But I did measure 27 mA in one test. I should really repeat these tests with well documented conditions for Teensy3....

    About a month ago, an update was made to Teensy3 to reduce power consumption by approx 6 mA (previously consumed by the Mini54 chip). Teensyduino 1.16 automatically updates any older board. All new boards now ship with the update.

  3. #3
    Would be nice if you could add Teensy 3 to the power usage info.

    Surprising to see that the power usage goes down by 60% if one switches to 3.3V.

    The only thing that's keeping me from switching to Teensy 3 is that I'm unsure about how to program it without using TeensyDuino. I ussually program in straight C using Make and GCC. For Teensy 2 I've got AVR-GCC installed on my machine, but haven't seen anything similar for Teensy 3. Could you post some info on how to go about this? Is there a similar package to AVR-GCC for ARM processor for use with Teensy 3?
    Last edited by bigpilot; 10-09-2013 at 02:45 PM.

  4. #4
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    There are several therads on the forum that provide some explanation on how to program a Teesny3 only with a make file.
    Just search the forum for "makefile" and dig in ;-)

  5. #5
    What would be the maximum power a teensy 3 may consume? need to find a good/cheap/easy solution for transforming 12V DC to 5V DC, depending on the power used I can go with dcdc converter or a way cheaper solution using zener diod or a solution between (voltage stabelizer),...
    I read in the electronical specification of the processor up to 100mA will be consumed,...

  6. #6
    Senior Member PaulStoffregen's Avatar
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    About 35 mA, plus current for anything Teensy is driving, like more LEDs if you've connected any.

  7. #7
    Senior Member+ manitou's Avatar
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    I can connect my meter to measure current if I use a DC jack on a breadboard to power my teensy 3* via Vin and no USB.
    Being electronically challenged, how do I measure current if I am running from the USB? splice into USB cable? hot wire over a fuse? some sort of USB breakout? ... Paul how did you hook up to measure current in your low_power.html?

  8. #8
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    you could hack/cut up a USB extension cable such as
    http://www.newegg.com/Product/Produc...82E16812423041

  9. #9
    Senior Member+ MichaelMeissner's Avatar
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    The simplest way is to buy a USB pass through device that measures the volts and amps. I bought this one a few weeks ago from a Hong Kong merchant: http://www.ebay.com/itm/USB-Power-Cu...item54009566c5.

    If you are willing to pay a little more, you can get it from a reseller in your country, such as this one from the USA (search for USB current and voltage tester): http://www.ebay.com/itm/USB-Power-Cu...item1c38523ba1

    Adafruit sells this device, that lets you hook up your own devices: http://www.adafruit.com/products/1456.

    Adafruit also sells this USB power gauge: http://www.adafruit.com/products/1549. The user interface is perhaps a bit clunky in that it just flashes LEDs for the different amount of amps used, but you can re-program the ATtiny85 inside of, perhaps to track amps over time.

    If you wanted to hack USB cables, Adafruit has some DIY USB cables that give you direct access to the 5/4 pins in a USB cable without have to hack the cable: http://www.adafruit.com/index.php?ma...arch&q=DIY+USB

  10. #10
    Senior Member PaulStoffregen's Avatar
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    You can also cut the VIN-VUSB pads apart and solder wires to connect a multimeter in current mode. When done, solder bridge them back together.

  11. #11
    Senior Member+ manitou's Avatar
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    Thanks. I'll probably go with splicing into a USB extender cable. Here are some board power measurements (UNO, maple, DUE, etc) with a simple sketch to turn the board LED on for 5 seconds then off for 5 seconds, and no "power tuning" code in the sketch. Tests are run with 7.5v to Vin via DMM so USB is not connected. No surprises, similar to results others have posted.

    https://github.com/manitou48/DUEZoo/...ster/power.txt

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