ZHCU623 January   2019

 

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3.2.2.2 Range

When the patch was worn, the temperature read from an android app was determined to have a signal strength of roughly –48 to –50 dBm at extreme close range. This translates to an expected range of roughly 12 meters (39 feet) in open air. In practice, this range was found to be around 40 feet for the patch under test when communicating to the SimpleLink SDK Explorer app through auto-advertisement. The only information transmitted was the temperature, therefore the app could be continuously updated without the need for an actual BLE connection between the patch and smart device. Range in practical designs will always vary based on obstacles in the RF signal path, position of the wearer, and radiated output power. If longer range is desired, a protocol other than BLE can be employed in a similar manner.