Forum Rule: Always post complete source code & details to reproduce any issue!
Tab Content
  • scaraman's Avatar
    Yesterday, 09:15 PM
    That was me too. My pile of dead boards is quite respectable. Makes a grown man cry. It seems like the powering sequence is the issue here. The motor power supply has to be turned on and stable before you turn on the...
    6 replies | 64 view(s)
  • scaraman's Avatar
    Yesterday, 04:22 PM
    Did some further research while waiting for new Teensies to ship. From https://learn.watterott.com/silentstepstick/faq/: And indeed the TMC is messing with VIO, the supplied 3.3V logic voltage, when powered...
    6 replies | 64 view(s)
  • scaraman's Avatar
    Yesterday, 04:37 AM
    Explaining your problems makes you think :) After some measurements it looks like the damned chip has internal pullups to some internally generated 5V. When motor power is supplied to the chip it will pull-up some IO...
    6 replies | 64 view(s)
  • scaraman's Avatar
    Yesterday, 04:24 AM
    Another Teensy project, another pile of dead teensies :( I hooked up a stepstick (TMC2208) by the book to a Teensy 4.0. EN, STEP and DIR are directly connected to Teensy pins, VCC_IO (as TMC calls it) to 3.3V...
    6 replies | 64 view(s)
  • scaraman's Avatar
    02-26-2020, 01:20 AM
    I have been struggling hard to make it keep some kind of dynamic balance, ie take speed into account. But I fail miserably all the time :( I think one of the problems is that the hobby servos have a massive slop in...
    6 replies | 383 view(s)
  • scaraman's Avatar
    02-12-2020, 09:20 PM
    The leg hinges are in PP, polypropylene, perfect plastic for hinges. And 3D printable, at least for simple items like this. There is still a bit of flex in non-wanted angles when the legs are at extreme sideways...
    6 replies | 383 view(s)
  • scaraman's Avatar
    02-12-2020, 08:57 PM
    I forgot to mention that never ever connect a PWM pin from the Teensy directly to a servo. It works fine until the cables on the servos short, intermittently, sends 6V to the teensy and fries it. Believe me, I have 5...
    6 replies | 383 view(s)
  • scaraman's Avatar
    02-12-2020, 08:28 PM
    I wanted to learn modern machine learning by building a small walking robot and have it controlled by a neural network. I will get to that, eventually. That's the primary reason I chose the Teensy 4 over other...
    6 replies | 383 view(s)
  • scaraman's Avatar
    02-12-2020, 06:16 PM
    That umbilical blob is a LiPo pack watcher. It beeps loudly when a cell is too low. I already broke one pack due to discharging it too much, my speciality is breaking hardware :)
    11 replies | 340 view(s)
  • scaraman's Avatar
    02-12-2020, 03:42 PM
    Got some videos of it walking/climbing/stumbling around. https://youtu.be/a22FzKibE3c I could write something about it and post in the Blog section.
    11 replies | 340 view(s)
  • scaraman's Avatar
    02-10-2020, 05:59 PM
    It turns out it was the servos sending back their supply voltage to the PWM pins! I was totally sure that one of my boards broke with no servos attached. I was wrong. The (very low quality) cables to the Tower Pro...
    11 replies | 340 view(s)
  • scaraman's Avatar
    02-10-2020, 02:44 PM
    Two more dead Teensies, only one left :(. At least I am supporting the project :) The last one died when I connected the USB port while the Teensy was powered on, running on battery. I use SPI so the LED is...
    11 replies | 340 view(s)
  • scaraman's Avatar
    02-07-2020, 09:20 PM
    The 2nd teensy with broken USB was "reprogrammed" using the 15s button hold you mention, it is blinking. When in programming mode or running that blink program there is no reaction from the USB host when plugged in,...
    11 replies | 340 view(s)
  • scaraman's Avatar
    02-07-2020, 02:24 PM
    I built this little board to control a little robot with a T4. It's mainly a puzzle of various pre-made modules. It has one big switching voltage regulator to provide power to 12 tiny servos, 5.5V. That voltage...
    11 replies | 340 view(s)
No More Results
About scaraman

Basic Information

Statistics


Total Posts
Total Posts
14
Posts Per Day
0.63
Last Post
Teensy 4.0 and step stipcks hookup. Yesterday 09:15 PM
General Information
Last Activity
Today 12:30 AM
Join Date
02-07-2020