stephan schulz

Member Since: March 20, 2009

Country: Canada

  • 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.

  • i’m interested to know how this led driver would compare to something like the TLC5940. certainly this one can handle higher amp leds but when using multiple channel of the TLC one could get similar or more current sinking. i guess i am just hoping to learn a bit more about the different options out there. thx.

No public wish lists :(