During the summer of 2015, I decided to focus on learning about the ‘Internet of Things‘ (IoT) and the supporting technology. The Internet of Things will consist of lots and lots of low powered devices embedded in common household appliances and gadgets.
The area that interests me most is the communications between IoT devices and the Internet, including the APIs, encryption, protocols, and algorithms that will make IoT possible.
The programming language I am planning to use is called Go (GoLang). The beauty of Go is that it can be compiled for multiple platforms (Linux (ARM/x86), Mac, Windows, Android, and iOS) and results in a single statically compiled executable.
The Raspberry Pi Stack was created with the following components.
Raspberry Pi 2 Model B Desktop (Quad Core CPU 900 MHz, 1 GB RAM, Linux)
Samsung Memory 32GB Evo MicroSDHC UHS-I Grade 1 Class 10 Memory Card
Anker 60W 6-Port Family-Sized Desktop USB Charger with PowerIQ
50 pack 10mm Body Long M3x6mm Male Female Brass Pillar Standoff Spacer
50 pack PC Mounting Computer Screws M3 x 1/4in Long Standoff
10 pack multi coloured Cat5e cables – 0.5 meter
6 pack Anker® 1ft Micro USB Cables High Speed USB 2.0 A Male to Micro B Cables
Plasticard Sheets A4 White 2.5mm
When purchasing the components, I assumed that the mounting holes on the Raspberry Pi 2 were wide enough to accept the 3mm wide screw on the standoff spacers. I was wrong, but I believe that I now have a better solution. The holes are M2.5, drilled to 2.9mm wide.
The M2.5 standoff spacers are really expensive in comparison and the multi-layer circuit board will be damaged if you try to force an M3 screw into the hole. There is actually some movement in the tower which is harmless against the plastic, but it could have eventually damaged the circuit boards if I had directly stacked the Raspberry Pis with the smaller spacers.
The single core Raspberry Pi B+ and Cisco RV320 firewall were surplus from previous projects. Although not entirely necessary, the Cisco firewall will help when I start experimenting with Docker and Kubernetes, which may require multiple networks. As the Raspberry Pi has only one network adapter, the firewall will support multiple virtual networks (VLANs) using the single network adapter. This will be better than using USB Ethernet adapters and an additional switch.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.