I successfully interfaced a TI Sensortag to an exercise bicycle. I measure the heat generated by the friction brake with the passive IR themometer and the the revolutions by wiring the bicycle's magnetic sensor to one of the button switches on the Sensortag. I successfully received the data using Bluetooth 4.0 communicating with a Nexus 7 (2013). Wiring the switch required the skills of a neuro-surgeon. Texas instruments should add a solder pad to the back side of the switches to aid in development.