While a Raspberry Pi is a full-fledged computer that can do more complex things than an Arduino microcontroller, it's not the best choice for every project.

Right now, the Ponte only supports Arduino Uno-sized shield, so the possibility of an all-in-one RepRap controller using the RAMPS motor driver is impossible for now.

Meanwhile, a Raspberry Pi can serve as the core of Home Assistant, and you can use the MQTT/Serial Communication/MySensors add-ons to connect the HASS instance with the Arduino weather station ...

The Raspberry Pi itself is not open source hardware, because it relies on a Broadcom ARM processor (the BCM2835) for its computing, graphics processing, and memory.