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Sure! I want to build a wristband that need a flexible rechargeable power source and to be programmed by bluetooth

petra 8y ago
What do you mean by flexible ? As for the wristband, have a look at hexiwear, and the hexiwear battery pack(which may be wearable). it has BLE and it does support "Firmware Over the Air update", i think.
- daviddumon 8y ago
  In my mind, it was something like that : https://news.panasonic.com/global/press/data/2016/09/en160929-8/en160929-8.html https://news.panasonic.com/global/press/data/2016/09/en16092... Flexible batteries you can embad in a tissue wristband for example. But I don't know if it's possible to do so. Thanks for the link I will check it out asap.
extra88 8y ago
The battery won't be flexible. You can have multiple batteries with flexible connections but they'll be a likely point of failure. Will you really need that much power? Bluetooth LE really is "low energy" as are many sensors. If it's supposed to make a lot of light, noise, has a motor, or use more powerful RF like WiFi, then the power requirements will be greater. You've already be directed to Adafruit which is a great resource, not just as a store and product developers in their own right but for all their learn materials and years worth of weekly videos. Here's a breakout board for charging their little LiPo batteries via MicroUSB. https://www.adafruit.com/product/1904 https://www.adafruit.com/product/1904
- daviddumon 8y ago
  I guess I got a lot to learn before answering the requirements question :/ Thanks for the link !
pjc50 8y ago
So, something very similar to fitness trackers and smartwatches? As others have pointed out, no flexible power sources; realistically you're going to end up with a single SoC that already has bluetooth, such as the Nordic Semiconductor ones. Most of these devices have on-demand displays to save power. Miniturising it and making the casework function is the hard part. You might be able to build a "desktop" version of it fairly easily..
- daviddumon 8y ago
  Yes, like a fitness tracker but with tissue. I don't even know if it's possible to combine lithium batteries and tissues :/

What do you mean by flexible ? As for the wristband, have a look at hexiwear, and the hexiwear battery pack(which may be wearable). it has BLE and it does support "Firmware Over the Air update", i think.

daviddumon 8y ago
In my mind, it was something like that : https://news.panasonic.com/global/press/data/2016/09/en160929-8/en160929-8.html https://news.panasonic.com/global/press/data/2016/09/en16092... Flexible batteries you can embad in a tissue wristband for example. But I don't know if it's possible to do so. Thanks for the link I will check it out asap.

extra88 8y ago

The battery won't be flexible. You can have multiple batteries with flexible connections but they'll be a likely point of failure. Will you really need that much power? Bluetooth LE really is "low energy" as are many sensors. If it's supposed to make a lot of light, noise, has a motor, or use more powerful RF like WiFi, then the power requirements will be greater. You've already be directed to Adafruit which is a great resource, not just as a store and product developers in their own right but for all their learn materials and years worth of weekly videos. Here's a breakout board for charging their little LiPo batteries via MicroUSB. https://www.adafruit.com/product/1904 https://www.adafruit.com/product/1904

daviddumon 8y ago
I guess I got a lot to learn before answering the requirements question :/ Thanks for the link !

pjc50 8y ago

So, something very similar to fitness trackers and smartwatches? As others have pointed out, no flexible power sources; realistically you're going to end up with a single SoC that already has bluetooth, such as the Nordic Semiconductor ones. Most of these devices have on-demand displays to save power. Miniturising it and making the casework function is the hard part. You might be able to build a "desktop" version of it fairly easily..

daviddumon 8y ago
Yes, like a fitness tracker but with tissue. I don't even know if it's possible to combine lithium batteries and tissues :/