About BlueTemp
BlueTemp connects Android to a temperature sensor device that can be built with a DS18B20 temperature sensor, an MSP430G2553 microcontroller, and a BlueSMiRF Bluetooth module. The schematics and firmware to build the device can all be downloaded from http://www.mikekohn.net/micro/bluetooth_thermometer.php along with an explanation how it works.
by W####:
Works great on my Samsung S4