The Arduino gets the fuel consumption readings from a Microstream OF05ZAT fuel flow sensor. The Arduino processes the data and then transmits it to a smart phone via a Bluetooth module.

This is the problem 1Sheeld wants to solve. 1Sheeld allows a you to use your cell phone as a sensor and I/O suite for your Arduino, replacing many existing shields.

Based on a Nordic Semiconductor 32-bit ARM system-on-chip that has built-in support for Bluetooth 4.0, the RFduino runs the same code as Arduino UNO and DUE boards, and it works with any type of ...

The MetaWear Bluetooth sensors take the form of tiny wireless low-power, wearable sensors that can be programmed to meet your requirements and controlled ...