5 ms·
Reset button is actually a safety issue, as the bulb would have to be plugged into the mains to register the reset. A metal paperclip inserted into the body of
by janekm 7y ago
Reset button is actually a safety issue, as the bulb would have to be plugged into the mains to register the reset. A metal paperclip inserted into the body of the light bulb would be very problematic from an electrical isolation point of view.
The big failure arguably is not testing the firmware sufficiently (or building in recovery algorithms) to necessitate a reset procedure in the first place.
- Retric 7y agoLightbulbs don’t get handled in operation. So you can have a huge reset button and no need for a paperclip. As to firmware, cosmic rays for example randomly flip bits. Which means for any large scale deployments you want a reset option.
- kingosticks 7y agoFirmware is likely to be stored in flash memory, which is far more resilient to cosmic rays than SRAM or DRAM. You might find a bitflip is so unlikely it's far below the other in-service failure rates and you'd rather just handle the returns. Of course, a reset is still useful for other reasons. All assuming you don't use the bulbs in your airplane/space shuttle! Edit: a source https://www.researchgate.net/publication/4082030_Flash_memory_under_cosmic_alpha_irradiation https://www.researchgate.net/publication/4082030_Flash_memor...
- Taniwha 7y agoLet me think - the reset button can only work when the light is powered up (and maybe too hot to touch) - you can't mount it on the metal base because that's live when it's on, and so the light fitting is designed so you can't touch the base. you could mount it in the glass but it would cast a shadow ... any solution has to cost less than a penny ...
- TeMPOraL 7y ago> Let me think - the reset button can only work when the light is powered up (and maybe too hot to touch) A capacitor that is kept charged during normal operation, and that powers the reset circuit which you close with your metal pin once you unscrew the bulb. The circuit flips some bits in persistent memory of the bulb.
- vinaypai 7y agoSo it resets every time you leave the bulb off long enough for the capacitor to discharge?
- TeMPOraL 7y agoNo. "Reset" is done by a circuit, and the only way to power it is by connecting that capacitor to it by pushing something into the reset pinhole. If you don't do that, capacitor eventually discharges but since the circuit never gets powered, no reset happens. So after a while you need to connect the bulb to mains power in order to be able to perform reset.
- deleted 7y ago[deleted]
- Retric 7y agoMost LED’s have a wide bit between the electric bit and the glass. Having that live would be a significant safety risk which I doubt major companies would risk. https://www.homedepot.com/p/Philips-75-Watt-Equivalent-A19-Non-Dimmable-Energy-Saving-LED-Light-Bulb-Daylight-5000K-2-Pack-463000/206923058 https://www.homedepot.com/p/Philips-75-Watt-Equivalent-A19-N... It’s a heat sink that gets hot to to the touch, though not that quickly as your talking ~10w of waste heat. Sill several ways to do a reset switch just after power is off.
- _carl_jung 7y agoIt has an app, right? So why not allow factory resetting from there?
- carlosperate 7y agoBecause often you want to reset to defaults when there is an issue connecting to the app.
- martyvis 7y agoSure, but the whole point of factory reset is when the paired phone app no longer talks to the bulb. ( You might have lost the phone or the account details). It just allows you to start with the assumption you are physically in control of the bulb and hence are authorised to reset it.
- vinaypai 7y agoAnd what happens when you lose your phone and need to pair it with a new device?