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I'm currently trying to configure a device that I can connect via Bluetooth to my cell phone. I want the device Bluetooth range about 15 feet. How do I control a Bluetooth range?

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  • \$\begingroup\$ What device? What phone? Do you have line of sight? \$\endgroup\$
    – HL-SDK
    Commented Oct 31, 2013 at 13:56
  • \$\begingroup\$ Most bluetooth low energy components let you set the transmit power level, but realize range is going to be approximate. Success over 15 feet seems readily achievable though. \$\endgroup\$ Commented Oct 31, 2013 at 15:19
  • \$\begingroup\$ need more details about the device that you are trying to configure. \$\endgroup\$ Commented Oct 31, 2013 at 16:17
  • \$\begingroup\$ With only a handful of embedded BLE chips on the market, we may actually not need more information - the capabilities of those that are out there are fairly comparable, many of them likely falling right out of the spec. \$\endgroup\$ Commented Oct 31, 2013 at 16:49
  • \$\begingroup\$ I'm working on a new device that needs to be able work with any phone. If the transmit power level adjustable then that is exactly what I need. I need a approximate range so that is also perfect. \$\endgroup\$ Commented Oct 31, 2013 at 18:22

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Classic Bluetooth has 3 different classes which specify range.

Class     Maximum Power      Operating Range
Class 1   100mW (20dBm)   100 meters (330 Feet)
Class 2    2.5mW (4dBm)    10 meters (33 Feet)
Class 3      1mW (0dBm)     1 meter (3.3 Feet)

In practice, I have found most Class 2 Bluetooth devices have a range of about 10 feet reliably.

Range is also affected by the usually things that effect a radio signal: Interference, antenna, walls, metal surfaces etc.

In your case you are using BLE (Bluetooth Low Energy) which does not specify range like Classic Bluetooth. So range will depend on the reasons given above and also the module you are working with, and whether it has the capability to adjust power level.

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    \$\begingroup\$ He asked about BLE, not classic Bluetooth for which your numbers don't apply. \$\endgroup\$ Commented Oct 31, 2013 at 16:04

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