Streaming humidity data from an Arduino sensor

The first stage of the process when building an application on top of IoT data is gaining access to the sensors. This process will look quite a bit different depending on the sensor you’re connecting to and where it is located. Since our sensor is located on an Arduino board with Wi-Fi connectivity, we choose to send it over the internet via REST. Conveniently, any workflow loaded to the KNIME Server automatically has REST endpoints generated for it. We’ll get to those and how to find them shortly.

First, a bit more background about the Arduino; we’ll need this knowledge to design an appropriate workflow to accept its data.

What is an Arduino?

We’ve used the name a bit already but as we get into this section on setting up the Arduino board and retrieving our sensor data, it’s important we recap what exactly we’re working with. Arduino is an open source software and hardware company. They...