In the kit Smartphone-based data logger there are several usages of smartphones. Apart from normal voice calling, they provide internet connectivity, social connectivity, and Bluetooth connectivity with other devices and many more. Here we have used the Android-based Smartphone to read data from different sensors like the temperature sensors and humidity sensors. The sensors are connected with a microcontroller having Bluetooth. The sensor values are read by the microcontroller and displayed on the LCD connected with it. These values are also forwarded to the Smartphone via Bluetooth.

In the kit Smartphone-based data logger the sensors are connected with the microcontroller via the one-wire protocol. The microcontroller keeps fetching the values of temperature and humidity from the sensors and displays them on the LCD. The LCD is the dot-matrix type of dimension 16x2. A Bluetooth module is also there connected with the microcontroller which works on the SPP profile. Hence all the data sent over is serial data over the UART port of the microcontroller. The Smartphone can have any application which could detect Bluetooth and read data over the SPP port of the Bluetooth.