Member Since: October 17, 2012

Country: United States

  • So, if you turned it off because you want it off, all it takes is a minor power glitch/brownout to turn it back on again? IMHO that is a problem. Not your design (the Echo that is), but more of an extended reason for an external power circuit.

    An easy way for the photon circuit to “remember” the last state is instead of controlling a transistor to pass power to the Echo, have the photon control a latching relay.

  • I haven’t gotten into the connected home bit yet, so I don’t know some of the actual use details. All this circuit does is disconnect and reconnect the power from the puck. Does the puck automatically turn-on (boot up) when power is applied? Or would you need to manually turn it back on?

    Thinking through further: Do these pucks remember if they were on when power was removed and then restore that state when power is restored? (I.e. if there is a power outage then when power is restored does it try to turn on if it was on beforehand, and stay off it it was off beforehand?) Same question for your power control module.

  • This looks similar to the scanner used by Neato Robotics vacuums. If the performance of my XV-21 is any indication, in many situations the proper application of SLAM should give good results. (Avoid thin or highly reflective obstacles.)

  • I have an idea for a future episode. It isn’t electronics, but it is a tool that is commonly used by makers:


    Start with a quick introduction to the types (vernier, dial, digital) and if there is time a quick primer in reading a vernier scale. Then go through the different ways (don’t just describe, but demonstrate) to use it, especially touching on some of the more advanced techniques.

  • Good reasonings from both.

    @CF - yes less expensive (as contrasted to “cheaper”) is preferable.

    @M-Short - I had forgotten about the SAMD21’s flexible pin configurations. Thanx for the reminder.

  • It seems to me that the SAMD21 is overkill for this. Wouldn’t a 32u4 work just as well and be cheaper to source the parts for? How much memory and speed do you really need to read several switches and analog inputs then spit the formatted data out over a UART port (to the XBee)?

    Or is ATMEL trying to EOL the 32u4?

  • The problem with zombie temps is their predilection for launching zombie processes…

  • Great. I look forward to your efforts. And, as mentioned in my OP, I’ll treat the KiCAD variants as someone’s extracurricular hobby, not as official SparkFun sanctioned and supported. :-D

  • LOL. Yeah, that’s why I said that the boards came back matching my design, but never mentioned if my design was correct. ;-)

  • Off topic, but are you using OSH Park’s KiCAD import? I used it once and the boards came back exactly matching my design. But one data point does not a statistic make…