Extending 433MHz Alarm Signals with LoRa

Fri, 02 Feb 2024 15:10:39 -0400

Door alarms have gotten more sophisticated over the years, but many newer systems are proprietary or comparatively expensive, especially when using Zigbee or similar ecosystems. The older 433 MHz sensors are cheap, simple, and widely available. Most of them use fixed-code amplitude encoding (1527, typically based on the EV1527 chip). The downside is range. In practice, the signal quality from these devices and the common receivers sold online can be poor. If the distance is more than a short span, something has to relay the signal.

Security on Daniel McDonough

Extending 433MHz Alarm Signals with LoRa