4 ms·
3*0.130 = 0.39 Wh Over 5000 years it would amount to about 8.9 nW (nanowatt), of course assuming the chemistry to be able to sustain such time span (which is no
by kalenx 7y ago
3*0.130 = 0.39 Wh
Over 5000 years it would amount to about 8.9 nW (nanowatt), of course assuming the chemistry to be able to sustain such time span (which is not).
- doersino 7y agoIf drained over a year (which is as long as the battery from the post you're responding to is supposed to last), it works out to: 390 mWh / (24 h * 365 d/Y) ≈ 0.061 mW = 61 μW
- crooked-v 7y agoIn that case, one of these diamond batteries would be able to substitute for the CR1632 and give a sealed tracker an effectively infinite lifetime (at least compared to, well, human civilization). I imagine it would be pricey, though.
- jfengel 7y agoIt also wouldn't be able to do drive a speaker, another key purpose of a Tile. Its actual tracking is primarily passive, so it's hard to locate with just a phone. (You might be able to triangulate from multiple phones... I recall an HN article with somebody doing that a few weeks ago). The main use case is to get close enough to trigger it, then follow your ears. That's thousands of milliwatts. I suppose it might be possible to add a capacitor that's being continually charged.
- sbierwagen 7y agoPiezo buzzers can be more efficient than that. This 95 cent buzzer sold by Adafruit is rated to 9V at 3mA: https://www.adafruit.com/product/1740 https://www.adafruit.com/product/1740
- jfengel 7y agoIs it loud enough? Tiles are supposed to be detectable at up to 300 feet, but that's less useful if you can't actually hear it. I don't actually know the specs they use for that. I just figured that it would take a few watts to be heard at distances over tens of feet.
- deleted 7y ago[deleted]