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stephan schulz

Member Since: March 20, 2009

Country: Canada

  • I installed board and libraries as per the guide on macos and windows. But both give me this following error message when trying to compile.

    WARNING: Category 'Communications' in library AST_CAN is not valid. Setting to 'Uncategorized'
    WARNING: Category 'Communications' in library AST_RS485 is not valid. Setting to 'Uncategorized'
    Sketch uses 1072 bytes (0%) of program storage space. Maximum is 130048 bytes.
    Global variables use 9 bytes (0%) of dynamic memory, leaving 4087 bytes for local variables. Maximum is 4096 bytes.
    avrdude: verification error, first mismatch at byte 0x0000
    0x14 != 0x0c
    avrdude: verification error; content mismatch
    avrdude: verification error; content mismatch

    What am I doing wrong?

  • we have bought (not with sparkfun) 40 of those sensors for a project that uses 2 sensor per arduino pro mini. we have nothing but problems with this sensor and it seems we are not the only ones. after 5 min the arduinos i2c port seems to crash.

    see all the troubles documented here: https://github.com/PulsedLight3D/LIDARLite_v2_Arduino_Library/issues/4 even the teensy forum seems very unhappy with this sensor: https://forum.pjrc.com/threads/28036-Translating-Lidar-Lite-I2C-example-to-Teensy?p=70142&viewfull=1#post70142

    did anyone have a success story using 2 of these sensors at the same time?

  • have you ever succeeded to pull data from the wireless heart rate sensor?

  • works great. would you know how to read the data from the vernier heart rate sensor? http://www.vernier.com/products/sensors/heart-rate-sensors/hgh-bta/


  • i was looking at your bill of materials, because i was wondering if this circuit could be driven with 24v. i need to make it work with an already existing architecture. you are mentioning higher voltage caps. would one also have to use a diode with a higher “Voltage – DC Reverse” ? I think the currently used diode has a rating of 23V. thx

  • i am driving the driver with a PWM signal from a teensy micro controller. it works fine. but the datasheet says: "The CTRL pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push-pull output stage."

    i know if i drive the rebel led driver (from sparkfun) with a regular PWM pin from an arduino it will burn the driver, because it too needs an open drain PWM signal.

    so why is the picobuck ok with using a regular PWM?

  • using this opto coupler 6N137 did not work.

  • at this point i tried driving the picoBuck from hardware PWM and software interrupt PWM of an arduino and both method caused flicker.

    then i tried the TLC from an arduino and did not see flicker.

    my preferred option would be using 16 picoBucks via a the 16 channels of a TLC. maybe by using a optocoupler.

    here is a video with the picoBuck on the left and the TLC for the 2 leds on the right: https://www.dropbox.com/s/0srg5wrzc54czh5/2013-12-19%2015.52.10.mp4

  • could i use 5 of them in parallel? i want to power a bunch of high amp LEDs via a TLC5940 led driver.

    i guess i am asking because the datasheet mentions something about Mhz. I am wondering if the switching frequency of this converter would possible be visible in the LEDs.

  • thanks for the info.

    so if someone would supply the TLC/LEDs with the right voltage (3V), by using a DC switching regulator (24V -> 3v), the efficiency would get better?

    I am not trying to find arguments against the picoBuck. it's a beautiful setup. I am just noticing that the TLC produces no flicker. See my other post. thx.

No public wish lists :(