Comparing the energy requirements of current Bluetooth Smart solutions

Bluetooth is becoming a popular way to get access to data delivered by sensors. To be convenient in use and low cost in maintenance, those sensors should consume as less energy as possible. Near the energy consideration of the sensing element, the proper selection of the Bluetooth Low Energy radio and software stack is vital to achieve low power consumption. There are several solutions on the market, with various claims with regard to power consumption. These claims are not easy to verify on the basis of the data sheets alone, making it long and difficult for engineers to choose the appropriate solutions. We have measured the energy consumption of several Bluetooth Smart solutions that can be found on the market today. The measurements were based on the important communication phases and the information available in various documents (datasheets, application notes). The result of that work is presented here. The work was done at the end of 2013 and early in 2014