BBBmini Rev. 1.6 wish list

Posted by Mirko Denecke on July 14, 2016 at 8:32am

Hello,

this is the next BBBmini Rev. 1.6 wish list. After discussion I will sort the requests into YES, MAYBE, NO.

YES:

  • Add second IMU
  • Add I2C bus pull up resistors
  • Add WS2812 LED support
  • Remove HC-SR04 support (results are not as expected)
  • Add Buzzer support
  • Add Power button header
  • Add Level shifter / remove resistor voltage divider

MAYBE:

  • Switch to 1206 SMD parts, because there is not enough space left on the PCB

NO:

  • rfm23bp support (HF and no driver yet)
  • Reduce PWM channels
  • IMU heating
  • Remove CAN bus support
  • Change PCB outline for BeagleBone Green Wireless

Regards

Mirko

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Replies

  • Mirko Denecke July 26, 2016 at 10:22am

    Hello Patrick,

    the PRU will then be used for the WS2812 LED driver :-)

  • Anemos Technologies July 26, 2016 at 10:07am

    pulsed light lidar lite is awesome and does not work well with I2C, the PRU capabilities of the bbbmini will be perfect for it

  • Patrick Poirier July 26, 2016 at 9:52am

    Hello Mirko,

    Agree , if someone really want to work with sonar, the best is to get a Maxbotic Sonar on I2c.

    The only sad thing is that, it is a real good demonstration of the PRU capabilities.

  • Mirko Denecke July 26, 2016 at 9:06am


    Hello Patrick,

    thanks for your test. That is the distance I can reach with my BBBmini HC-SR04 too. I think we can skip HC-SR04 support, what do you think? 

    Regards

    Mirko


    Patrick Poirier said:

    Hey Linus,

    I putted my ''orange crush'' , under test with the sonar, and it just works fine on a flat hard ground at a low altitude (10 - 50 cm) .  So it is ideal to test in the garage or on a tennis court ;-), that is about what the SR04 can accomplish.

    (this baby is made of plywood and is running on a naze32 + cleanflight. I installed the bluetooth telemetry for the test. generally it is flying with the camera deck installed)

    3702273579?profile=original

  • Patrick Poirier July 26, 2016 at 4:25am

    Hey Linus,

    I putted my ''orange crush'' , under test with the sonar, and it just works fine on a flat hard ground at a low altitude (10 - 50 cm) .  So it is ideal to test in the garage or on a tennis court ;-), that is about what the SR04 can accomplish.

    (this baby is made of plywood and is running on a naze32 + cleanflight. I installed the bluetooth telemetry for the test. generally it is flying with the camera deck installed)

    3702273579?profile=original

  • Developer
    Linus July 23, 2016 at 4:34am

    Hi Patrick,

    yes, using SMD parts will not fit the targeted user base though some space could be made free for new ideas.
    Hopefully i can buy one of these available CAN ESC's soon for a Rover / Plane to get the ball rolling.

    I wonder what makes Cleanflight and the naze acro bard work with the HC-SR04.
    https://www.youtube.com/watch?v=Ury7ZGCPyO4

    The sensor is too cheap to expect wonders but what are the options available for the budget ?

    Cheers
    Linus

  • Patrick Poirier July 22, 2016 at 4:23pm

    Hello Linus,

    Just think of it,  the CANBUS footprint is 15 x 35mm (525 sq) out of 43x55 mm (2,365sq)  usable space on the board, so there is 22% of total space dedicated to this option. I wish that we could get affordable CANBUS devices but it seems quite remote as of now..

    Concerning  SMD, the Level Shifter could be a good candidate for this option because it is just one chip and the format (PW package) is doable with a soldering iron, flux and practice. But we might lose a couple of interested DIYers because it is one step beyond through-hole building.

    Please comment, best regards

  • Developer
    Linus July 22, 2016 at 2:46pm

    Hi,

    don't want to request to much without actually contributing to the PCB but is SBUS output feasible maybe?

    I am voting for leaving CANBUS on the Board as i want to test it when more cheap CAN ESC's show up. Its just that no one developed a ~50€ version yet.

    Regarding SMD I think i could mount a SMD WS2812 LED on to the board easy, transceiver, resistors etc would probably work as well with some practice.

    Rev. 1.6 should get a new low profile case and with Display in the lid then.

    Cheers

    Linus

  • Mirko Denecke July 22, 2016 at 1:16pm

    Hi Patrick,

    you are right, most users need not more than 6 PWMs, but I will not reduce the number of channels yet.

    Regards

    Mirko



    Patrick Poirier said:

    Some additional mods

    A) Lowering the modules = Changing connector type can help getting a lower profile (5mm).

    3702268392?profile=original

    Please note that these are the 4 ports unidirectionnal level shifter  ( less than 1$ at ALIEXPRESS) that could be used as PWM drivers. 

    B) Optimization of the rear end connection

    Reduce the number of PWM channels to 1- 6 and move on connector 7-12 these IO:

    PPM-In 

    Buzzer 

    Curr-Volt 

    Airspeed 

    I2C (3rd) 

    C) CANBUS == Please ask if ANYONE is using it 

    You could easily use this space for the bidirectionnal  level shifter == Adafruit TXB0108

    3702268604?profile=original

  • Mirko Denecke July 22, 2016 at 1:12pm

    Hi,

    thanks for the suggestion, but I do not want to put HF on the BBBmini. And first there must be a working driver for the rfm23bp.

    Regards

    Mirko


    Anemos Technologies said:

    what about the rfm23bp support ? we are ready to make the driver for it

This reply was deleted.