Sensor Network History 2 – Second Iteration

A project log for SENSEation

Modular sensing platform for research

Mario FreiMario Frei 08/02/2018 at 12:540 Comments

For the second iteration of the sensor network, I tried to make the sensor nodes universal and smaller. I integrated more sensors and switched from on-site internet to cellular. The sensor nodes were still powered with wall plugs. An Arduino Pro Mini was chosen as a microcontroller unit, and XBees were used for wireless communication. The sensor selection was as follows:

The sensors were only used in certain combinations, e.g., two temperature sensors and a heat flux sensor for u-value measurement. The combination of the sensors had to be set with a rotary switch on the sensor node PCB. The gateway consisted of a Raspberry Pi, a USB-GSM-modem, an Xbee, USB memory stick, and a powered USB hub. The data was stored on the memory stick and in an online MySQL table. I chose a Raspberry Pi in order to have more computational power for having room to add more features. This version of the sensor network was deployed in four different case studies. Some of the results can be found here:

Now to the interesting part, the issues:

In summary: