Bluetooth low energy

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aneff
 
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Joined: Thu Apr 17, 2014 8:36 am

Bluetooth low energy

Post by aneff »

Ok so I have to start this by saying I am a Mechanical engineer minoring in design so I know VERY little. I am making a step tracking device for in a shoe and I need to communicate via bluetooth to a smartphone.
1. does adafruit have a bluetooth low energy chip?
2. price for my project but I think that will come from the link of the chip.
3. I need to figure out power requirements so I can size the battery. I am using a FSR to collect steps and the bluetooth to transmit so I am not using much at all and the bluetooth will basicially size my battery... I think...

Help anyone...

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adafruit_support_bill
 
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Re: Bluetooth low energy

Post by adafruit_support_bill »

We do have a Bluetooth LE module: https://www.adafruit.com/product/1697
It implements a simple serial link, so you will also need something to monitor the FSR and transmit the data. This could be as simple as a Trinket or Gemma:
https://www.adafruit.com/product/1222
https://www.adafruit.com/products/1500

You can run the whole thing from a 3.7v LiPo cell. Capacity requirements will depend on the run-time you are looking for. But the current draw of the transmitter & microcontroller should be on the order of 20mA peak during transmission. Absolute worst-case, a 500mAh cell should last you all day. With some careful design, you should be able to reduce the current demands to a fraction of that.

THe nRF8001 transmitter specs can be found here:
http://www.nordicsemi.com/eng/Products/ ... gy/nRF8001

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