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I'm developing a project that has a bluetooth module transmit to an android phone. The project is extremely power limited (it's energy harvesting) and I'm wondering how much power am I looking at to transmit Bluetooth data?

The bluetooth module will be getting sensor data and transmitting that data to a phone about 10 feet away, ideally whenever the user calls for it, but can limit it to maybe every 30 minutes minimum wait.

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  • \$\begingroup\$ How far are you transmitting? \$\endgroup\$ – endolith Nov 7 '11 at 21:57
  • \$\begingroup\$ about 10-15 feet \$\endgroup\$ – Eugene K Nov 7 '11 at 22:03
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It will depend on the bluetooth module you've chosen and how busy it is in your application. The Raytheon BC04 module is fairly typical:

Deep sleep  40uA 
ACL 40ms sniff  2.4mA 
SCO connection HV1  39mA 
Tx burst +4dBm  58mA

For an energy harvesting application, Bluetooth Low Energy (Bluetooth Smart) is likely to give you better results.

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  • \$\begingroup\$ That's a lot of current for "deep" sleep. \$\endgroup\$ – Joel B Nov 7 '11 at 21:53
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    \$\begingroup\$ Bluetooth Low Energy is Bluetooth 4.0 right? Problem is most android phones only go up to BT 2.1. \$\endgroup\$ – Eugene K Nov 7 '11 at 22:02
  • \$\begingroup\$ Yes, the latest iPhones have the hardware to support it, but not much else yet. \$\endgroup\$ – Toby Jaffey Nov 7 '11 at 22:47

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