Can somebody give me simple example code for Microsoft Windows 10 Core for IoT - Windows Universal App project C# , for having Raspberry Pi 2 with Windows 10 and reading temperature from GPIO with DS18B20 sensor ?
The DS18B20 is a digital temperature sensor that uses a 1-wire interface which only requires 1 port pin for communication.
Unlike other platforms, Windows 10 IoT does not have libraries or micro-second timer resolution needed to read 1-wire devices.
This project uses the UART0 Rx/Tx pins to communicate and read temperature values from the DS18B20, and can probably be easily adapted to read other 1-wire devices.
The code is based on Electric Imp's 1-wire bus over UART found here: https://electricimp.com/docs/resources/onewire/
A second alternative is to acquire a DS2428-100 Single-channel 1-Wire Master chip that can interface between I2C and 1-Wire devices. The following code can be used for that: https://github.com/Rinsen/OneWire
A third alternative is to use an Arduino device in "slave mode", and accessed via the I2C bus. See: http://blog.oscarliang.net/raspberry-pi-arduino-connected-i2c/
BMP180 Sensor project will do temperature for you. The sensors are only $7.00 on Amazon. Use the link above and it will guide you all the way through the process. Just not the same chip.