WiFi above 2.4 GHz gets shorter range, higher throughput, and most of the industry’s attention. WiFi below 1 GHz gets the opposite: longer range, lower throughput, and almost no consumer coverage despite being standardized in 2016. 802.11ah — marketed as WiFi HaLow — is a genuinely distinct technology addressing problems that neither standard WiFi nor cellular IoT handles well. It deserves more attention than it receives. Why Sub-1 GHz Matters for IoT The physics of radio propagation favor lower frequencies for range and obstacle penetration.

The Arduino ecosystem has grown from a single hobbyist board into one of the most expansive open-source hardware platforms on earth — spanning over 100 official boards, 32,000+ libraries, and a community responsible for more than 50 million boards sold. Whether you are building a home automation node, a CNC controller, or an edge AI inference device, the ecosystem almost certainly has a purpose-built piece of hardware and a ready-made library to match.

The spec sheet for a Raspberry Pi reads like a modest embedded processor. What people actually build with one reads like an infrastructure engineer’s fever dream. Over the years, the platform has accumulated a body of real-world deployments that range from cost-effective home network appliances to production-grade industrial monitoring systems. This post examines a cross-section of those deployments — not hobbyist proof-of-concepts, but functioning systems solving real operational problems. The case studies below span home labs, small businesses, agriculture, aviation, scientific research, and industrial environments.