This article is about a small sensor node with a decorative case. It is based on the Raspberry Pi Zero W board with a custom sensor shield on top.
I publish all hardware files for a simple version of the sensor, so you should be able to build this kind of sensor nodes and use it to monitor anything you like. You can also extend/modify the design easily with additional sensors. Nevertheless, the case lid design is based around the Plantower PMSA003 particle sensor. It has all required air vents for this use.
The term “node” is used, because the idea of this sensor is to use a large number of these nodes in a network to monitor location and time based sensor data.
I cannot publish any software at this point, until I have a simplified and redacted version which I can publish under an open source license. Yet, accessing the sensors of this node is dead simple and can be easily done.
The Required Hardware
The simplified design is assemble using the following components:
- Raspberry Pi Zero W with soldered headers.
- Minimalistic Custom Shield (see description below)
- Short 40 Pin Header for Raspberry Pi
- Plantower PMSA003 Particle Sensor
- Optional: MICS-VZ-89TE VOC Sensor
- Four short M2.5 screws and nuts to fasten the Raspberry Pi in the case.
- Optional four M2.5 10mm long spacer to also fasten the shield.
- One or two short M2 screw to fasten the Plantower sensor to the shield.
- USB Cable and power supply to power the node.
The Raspberry Pi Zero W
I use the Raspberry Pi Zero W because of the very compact size and computing power. Each node can prepare the sensor data, which takes a lot of load from the central processing unit. Also, using a platform like the Raspberry Pi easily allows to run a whole web server on each node – so one can query the sensor data of each node independently. This makes testing a breeze.Continue reading Tiny Particle Sensor Node with Decorative Case