This post will be extensive so will be separated into 3 parts to make it easier to write and read. I have spent the last couple of months developing a weather station; both for the fun of it and to improve my understanding of the C programming language. The weather station will perform quite a few tasks. It comes in 3 separate bits; several remote sensors that transmit their temperature, location and battery status over an RF link, a receiver module that receives the data over the RF link and the raspberry pi main station which talks over I2C to the receiver unit to get the data. The raspberry pi then processes this information to display on an LCD screen. It has five buttons; one switches between all remote sensors and it’s self, 2nd switches between the data&time, IP address and WiFi signal strength, 3rd switches between Celsius and Fahrenheit, 4th turns the display backlight on/off and 5th safely turns the raspberry pi off. All of the code is written in C, both the raspberry pi and arduino.