Gather Data on Raspberry Pi with Cassandra and Arduino

Intro

In the previous post we went over the steps necessary to make a sensor for a small greenhouse for the balcony.

1. Arduino Greenhouse

In this section we are going to concentrate on how to gather the data coming in from the Greenhouse. The approach is applicable for any kind of telemetry data or something similar. The parts list is simpler than in the previous section but as a "concentrator" node we are going to use a raspberry pi. Here are the parts:

• Arduino Uno
• USB cable
• Raspberry PI
• nRF24L01+
• 7 Wires

To install Arduino libraries please consult the previous post. The wiring for the nRF24 is the same as in the previous post.

Persisting the data

To persist the data I opted for Apache Cassandra. It's a good fit even for a low powered Raspberry Pi. Cassandra is java technology. So before installing Cassandra you have to install java. It's all written up nicely in the following posts:

1. Install Java
2. Installing Cassandra

Overview of the process

The code

1. Data Gathering in Arduino
2. Python serial to Cassandra bridge

To be continued ...