5 ms·

From #diamondbattery tweets: https://twitter.com/search?q=%23diamondbattery https://twitter.com/search?q=%23diamondbattery Could be used in underground seismic

From #diamondbattery tweets: https://twitter.com/search?q=%23diamondbattery https://twitter.com/search?q=%23diamondbattery Could be used in underground seismic monitors https://twitter.com/Keminoes/status/803297734694465541 https://twitter.com/Keminoes/status/803297734694465541 Car keys that require batteries. If we don't have a spare battery with us and our keys die, we're stranded. MP3 players, too https://twitter.com/tysongeisler/status/803438384052129796 https://twitter.com/tysongeisler/status/803438384052129796 To power a low-power-mode Arduino for gas detection (CO, CO2, Low O2, etc), fire detection, radiation detection, etc. https://twitter.com/noalear/status/803389146433626112 https://twitter.com/noalear/status/803389146433626112 Could diamond batteries be used to power medical nanobots? https://twitter.com/weirbe/status/803418222972125184 https://twitter.com/weirbe/status/803418222972125184 Power clothes that contain sensors, as well as clothes that electrically regulate the temperature. https://twitter.com/CIMCloudOne/status/803440800759574528 https://twitter.com/CIMCloudOne/status/803440800759574528 how about in cell phones to give a little charge to the battery while the phone is not in use. https://twitter.com/W_Haas/status/803352403512872961 https://twitter.com/W_Haas/status/803352403512872961 Is there the potential to power watches as a fair amount of waste is generated from depleted watch batteries each year. https://twitter.com/Merrett72/status/803297788163289088 https://twitter.com/Merrett72/status/803297788163289088

flukus 10y ago
> Car keys that require batteries. If we don't have a spare battery with us and our keys die, we're stranded. There was a great solution for this in use for over a hundred years.
- snuxoll 10y ago
  My 2006 has a workable solution as well that doesn't require a traditional key, there's a slot you can put your key fob in to start the car even if the battery in it is dead (only option on trims sold without the Smart Key System) and the driver door has a mechanical lock that can be opened with a key hidden in the fob. Keyless entry and ignition is a great convenience, especially for my wife since she can keep the fob buried in her bag - and it makes it easy for me to put my daughter in the car without trying to wrangle the fob out of my pocket to unlock the door. But it floors me that so many manufacturers just ignore the use-case where the battery in the fob is dead...
  - outworlder 10y ago
    But do they, though? I'm thinking it's just a matter of actually reading the owner's manual. For instance: there's a key hidden in the fob of my Nissan Leaf that is able to mechanically unlock the driver door, same as your 2006. To start the car, you place it against the "start" button. I'm assuming there's some inductive trickery going on. Anyway, I'd be surprised if our cars (2006 and 2015) were the exception, rather than the rule.
    - flukus 10y ago
      > But do they, though? I'm thinking it's just a matter of actually reading the owner's manual. It's in the glove box...
    - SomeCallMeTim 10y ago
      We're on our third keyless entry car. The 2014 Chevy Volt was the worst, but they all had that feature. I had to read the manual to find the trick, but you: * Open up the compartment on top of the center of the dashboard * Take out the rubber liner on the bottom of the compartment * Pop the mechanical key out of the fob * Poke the mechanical key into an unlabeled hole in the bottom of the above compartment And bingo, your car will start. The Kia Sorrento we have with a keyless system is much more sane: The center panel has a really obvious place to push the whole keyfob in, and it will start with a dead fob battery. The Toyota Prius we used to own also had keyless, and also had a place to insert the whole keyfob to start the car when the battery died. And it was also pretty obvious (and labeled). It's only the Chevy Volt where it was an absolute mystery what you're supposed to do (unless you read the manual). I don't think I would have ever guessed that you should disassemble the compartment on top of the dashboard and stick the key into an unlabeled hole. Would have been afraid of shorting something out.
      - derekp7 10y ago
        On my Ford Fusion, it apparently has a passive RFID chip in the key fob in case the battery dies, and the reader is in the bottom of the cup holder. And a hidden key inside the fob, that you can use to pry off a plastic shroud on the door handle to get access to a hidden cylinder lock on the door.
ComputerGuru 10y ago
> To power a low-power-mode Arduino for gas detection (CO, CO2, Low O2, etc), fire detection, radiation detection, etc. https://twitter.com/noalear/status/803389146433626112 https://twitter.com/noalear/status/803389146433626112 Except you wouldn't use an Arduino; AVR processors are notorious power hogs when you start counting the milli (and micro) watts. Run-of-the-mill TI MSP430 microcontrollers, aside from being arguably more powerful and better designed at similar price points, consume less than 1 microamp in idle mode.
- wyager 10y ago
  > AVR processors are notorious power hogs > MSP430 microcontrollers ... consume less than 1 microamp in idle mode. As someone who's done extremely low-power development on both platforms, this is an extremely disingenuous comparison. Of course MSP430s consume very little current in idle mode. So do AVRs. People just don't usually run them at low frequencies or in idle mode, because Arduino is targeted at novice users, not people who know how to do low-level power management. I've been running an ATTiny off the same pair of AA batteries, blinking an LED for 50ms every 5 seconds for 4 years. Just turn all peripherals off, maximum clock prescaler division, sleep mode with wake on watchdog interrupt. There's functionally no way to get better performance out of an MSP430 in real-world applications. While I prefer the MSP430 instruction set, beyond that there's no obvious all-around advantage over the AVR family.
  - danellis 10y ago
    > maximum clock prescaler division How do you calculate the tradeoff between the low power of a lower clock frequency and the shorter active time with a higher clock frequency?
    - wyager 10y ago
      If you're computation bound, unless you have a very current-limited power supply, you can just max out the clock when you wake up and turn it back down before sleeping. In my case I had to be awake for some time anyway, so I just used the lowest clock frequency I could.
ryao 10y ago
A tablet computer that does not need external power would be nice. Even using this in an e-book reader with an e-ink display would be great. A wireless mesh network that needs no external power for emergency communications would also be nice. Just imagine being able to place nodes on utility poles and not having to worry about paying for electricity.
deleted 10y ago
[deleted]

flukus 10y ago

> Car keys that require batteries. If we don't have a spare battery with us and our keys die, we're stranded. There was a great solution for this in use for over a hundred years.

snuxoll 10y ago
My 2006 has a workable solution as well that doesn't require a traditional key, there's a slot you can put your key fob in to start the car even if the battery in it is dead (only option on trims sold without the Smart Key System) and the driver door has a mechanical lock that can be opened with a key hidden in the fob. Keyless entry and ignition is a great convenience, especially for my wife since she can keep the fob buried in her bag - and it makes it easy for me to put my daughter in the car without trying to wrangle the fob out of my pocket to unlock the door. But it floors me that so many manufacturers just ignore the use-case where the battery in the fob is dead...
- outworlder 10y ago
  But do they, though? I'm thinking it's just a matter of actually reading the owner's manual. For instance: there's a key hidden in the fob of my Nissan Leaf that is able to mechanically unlock the driver door, same as your 2006. To start the car, you place it against the "start" button. I'm assuming there's some inductive trickery going on. Anyway, I'd be surprised if our cars (2006 and 2015) were the exception, rather than the rule.
  - flukus 10y ago
    > But do they, though? I'm thinking it's just a matter of actually reading the owner's manual. It's in the glove box...
  - SomeCallMeTim 10y ago
    We're on our third keyless entry car. The 2014 Chevy Volt was the worst, but they all had that feature. I had to read the manual to find the trick, but you: * Open up the compartment on top of the center of the dashboard * Take out the rubber liner on the bottom of the compartment * Pop the mechanical key out of the fob * Poke the mechanical key into an unlabeled hole in the bottom of the above compartment And bingo, your car will start. The Kia Sorrento we have with a keyless system is much more sane: The center panel has a really obvious place to push the whole keyfob in, and it will start with a dead fob battery. The Toyota Prius we used to own also had keyless, and also had a place to insert the whole keyfob to start the car when the battery died. And it was also pretty obvious (and labeled). It's only the Chevy Volt where it was an absolute mystery what you're supposed to do (unless you read the manual). I don't think I would have ever guessed that you should disassemble the compartment on top of the dashboard and stick the key into an unlabeled hole. Would have been afraid of shorting something out.
    - derekp7 10y ago
      On my Ford Fusion, it apparently has a passive RFID chip in the key fob in case the battery dies, and the reader is in the bottom of the cup holder. And a hidden key inside the fob, that you can use to pry off a plastic shroud on the door handle to get access to a hidden cylinder lock on the door.

ComputerGuru 10y ago

> To power a low-power-mode Arduino for gas detection (CO, CO2, Low O2, etc), fire detection, radiation detection, etc. https://twitter.com/noalear/status/803389146433626112 https://twitter.com/noalear/status/803389146433626112 Except you wouldn't use an Arduino; AVR processors are notorious power hogs when you start counting the milli (and micro) watts. Run-of-the-mill TI MSP430 microcontrollers, aside from being arguably more powerful and better designed at similar price points, consume less than 1 microamp in idle mode.

wyager 10y ago
> AVR processors are notorious power hogs > MSP430 microcontrollers ... consume less than 1 microamp in idle mode. As someone who's done extremely low-power development on both platforms, this is an extremely disingenuous comparison. Of course MSP430s consume very little current in idle mode. So do AVRs. People just don't usually run them at low frequencies or in idle mode, because Arduino is targeted at novice users, not people who know how to do low-level power management. I've been running an ATTiny off the same pair of AA batteries, blinking an LED for 50ms every 5 seconds for 4 years. Just turn all peripherals off, maximum clock prescaler division, sleep mode with wake on watchdog interrupt. There's functionally no way to get better performance out of an MSP430 in real-world applications. While I prefer the MSP430 instruction set, beyond that there's no obvious all-around advantage over the AVR family.
- danellis 10y ago
  > maximum clock prescaler division How do you calculate the tradeoff between the low power of a lower clock frequency and the shorter active time with a higher clock frequency?
  - wyager 10y ago
    If you're computation bound, unless you have a very current-limited power supply, you can just max out the clock when you wake up and turn it back down before sleeping. In my case I had to be awake for some time anyway, so I just used the lowest clock frequency I could.

ryao 10y ago

A tablet computer that does not need external power would be nice. Even using this in an e-book reader with an e-ink display would be great. A wireless mesh network that needs no external power for emergency communications would also be nice. Just imagine being able to place nodes on utility poles and not having to worry about paying for electricity.

deleted 10y ago

[deleted]