RF Remote Made Easy

The 433 MHz spectrum is a little bit of an oddball. It’s one of the few areas of the radio spectrum which is nearly universally unlicensed, meaning as long as devices using it adhere to the p…

Decoding 433 MHz Signals With Arduino & Raspberry Pi

433 MHz radio signals are all around us. They’re used for things like smart power plugs, garage door openers, and home weather stations. Decoding these signals can allow you to interface and …

Low-Cost 433 MHz Door Sensors Get Open Firmware

It’s an unfortunate reality these days that if you see a cheap piece of consumer electronics, there’s a good chance its only cheap because it’s designed to lock you into some ecos…

Connecting Commercial 433 MHz Sensors To MQTT And Home Assistant With RTL-SDR

When [Elixir of Progress] was looking at setting up environmental sensors around their home to keep track of temperature, humidity and such, the obvious ideas of using WiFi-connected sensors didn&#…

Unintentional Emissions

First, it was the WiFi router: my ancient WRT54G that had given me nearly two decades service. Something finally gave out in the 2.4 GHz circuitry, and it would WiFi no more. Before my tears could …

Teardown: Impassa SCW9057G-433 Alarm System

This series of monthly teardowns was started in early 2018 as an experiment, and since you fine folks keep reading them, I keep making them. But in truth, finding a new and interesting gadget every…

ESP8266 Adds WiFi To A 433 MHz Weather Station

There’s no shortage of cheap weather stations on the market that pull in data from several wireless sensors running in the 433 to 900 MHz range and present you with a slick little desktop dis…