Help in Zolertia z1 Board

I am working on a project to deploy a Wireless Sensor Network in the Amazon Rainforest and I have chosen RIOT OS for this project. I´m looking for examples on how to use the RIOT OS with the zolertia z1 Board, especially with the serial ports (UART, I2C and SPI) to communicate with external sensors. Any kind of information will be helpfull for the development of this project.

Best Regards

Joel Palomino