Marc, The helpful annoying folk at TI have produced this Bluettoyh sensor deelopment system: https://estore.ti.com/CC2541DK-SENSOR-CC2541-SensorTag-Development-Kit-P319= 2.aspx?DCMP=3Dsensortagkitoftheyear&HQS=3Dsensortagkitoftheyear-estore $US25.. They say: The SensorTag is the first Bluetooth Smart development kit focused on wireless sensor applications and it is the only development kit targeted smart phone app developers. The SensorTag can be used as reference design and development platform for a variety of smart phone accessories. TI is making Bluetooth low energy app development easier and faster with the CC2541 based SensorTag, which has all the commonly used sensors on a single board for quick evaluation and demonstration. The SensorTag works with TI=92s TPS62730 (step down converter), and includes TI=92s TMP006 IR MEMS temperature sensor, humidity sensor, pressure sensor, accelerometer, gyroscope and magnetometer. The versatility of the SensorTag means limitless app possibilities including those for health and fitness, medical, educational tools, toys, remote controls, mobile phone accessories, proximity and indoor locationing. The CC2541 SensorTag kit shortens the design time for Bluetooth low energy app development from months to hours with no embedded software design knowledge required. The SensorTag includes all FW needed to get started with App development and TI has a SensorTag App on the App Store providing developers with easy access to the tools they need. Sensors on the SensorTag IR temperature Sensor Humidity Sensor Pressure Sensor Accelerometer Gyroscope Magnetometer Go to CC2541 SensorTag product page for further information. http://www.ti.com/tool/cc2541dk-sensor --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .