3 ms·

if the device is raddio (bluetooth) controlled, wouldnt it be more sane to reset through the bluetooth device? perhaps a unique serial number on the bulb (verif

if the device is raddio (bluetooth) controlled, wouldnt it be more sane to reset through the bluetooth device? perhaps a unique serial number on the bulb (verifies access to the bulb), and/or a bulb generated string of random bits (on/off), so the user enters for say 10 cycles if the bulb is on or off (prevents replay attacks)? ok, you should close the window blinds. or even simpler: just unscrew and rescrew the lightbulb to reset!

StavrosK 7y ago
> wouldnt it be more sane to reset through the bluetooth device No, because you might be resetting because you can't connect with the bluetooth device. > or even simpler: just unscrew and rescrew the lightbulb to reset! How does the light bulb know it's unscrewed? How is that different from turning the switch off?
- DoctorOetker 7y ago
  How does the light bulb know it's unscrewed? How is that different from turning the switch off? it could easily measure this by either: - a limit switch, or - a split center electrode: if there is a conducting path between left and right halves between center electrode, then the bulb is screwed in, or - measuring the capacitance between outer and center electrode: in open air there is the known capacitance, when screwed in both the electrodes of the housing, and the long parallel conductors going to the switches will alter the capacitance - myriad other ways: electrically there is a huge difference between an unscrewed bulb, and a screwd-in bulb in an open circuit
  - StavrosK 7y ago
    How does it do all this with no power?
    - DoctorOetker 7y ago
      a capacitor to power the microcontroller for a few milliseconds? actually, if the goal is to detect a reset operation by unscrewing: while unscrewing and shortly after the circuit is open, the previously contacting electrodes are still close by, such that it can be powered capacitively while it realizes it is being reset... this is probably noticable by measuring the change in complex impedance
      - StavrosK 7y ago
        Your solution is to make laypeople unscrew the bulb with the socket still live, while increasing the cost of each bulb by a lot?

StavrosK 7y ago

> wouldnt it be more sane to reset through the bluetooth device No, because you might be resetting because you can't connect with the bluetooth device. > or even simpler: just unscrew and rescrew the lightbulb to reset! How does the light bulb know it's unscrewed? How is that different from turning the switch off?

DoctorOetker 7y ago
How does the light bulb know it's unscrewed? How is that different from turning the switch off? it could easily measure this by either: - a limit switch, or - a split center electrode: if there is a conducting path between left and right halves between center electrode, then the bulb is screwed in, or - measuring the capacitance between outer and center electrode: in open air there is the known capacitance, when screwed in both the electrodes of the housing, and the long parallel conductors going to the switches will alter the capacitance - myriad other ways: electrically there is a huge difference between an unscrewed bulb, and a screwd-in bulb in an open circuit
- StavrosK 7y ago
  How does it do all this with no power?
  - DoctorOetker 7y ago
    a capacitor to power the microcontroller for a few milliseconds? actually, if the goal is to detect a reset operation by unscrewing: while unscrewing and shortly after the circuit is open, the previously contacting electrodes are still close by, such that it can be powered capacitively while it realizes it is being reset... this is probably noticable by measuring the change in complex impedance
    - StavrosK 7y ago
      Your solution is to make laypeople unscrew the bulb with the socket still live, while increasing the cost of each bulb by a lot?