Hi @mixpc
See my posts in the other topic. D026 mentioned in the link to the Chinese store is the best option for 433mhz open door sensors and can be used with any of the 433mhz project implementation (Pilight, OpenMQTT, RFLink, etc). D026 is a product not a manufacturer brand (there are sensors from Kerui, Fuers, Secrui but they’re all the same and usually wholesale packaging comes without any manufacturer branding at all).
It sends four codes (open/close/tamper/low battery) and can be painted to match the color of the door/window so that it blends in the environment without issues on the range.
Generally speaking, there are two main disadvantages of D026 vs. the more high class Zigbee/Z-wave open door sensors:
- security (this is inherent to most of 433mhz devices, as they send the codes without any encryption; although neither Zxxs are 100% secure, they’re better than no security at all); in most of the cases this would not represent an issue by itself (although an attacker would basically know when a door/window is closed and if there is movement in the house recorded by PIR sensors, he needs to be relatively close to the sensor - that is 15-20 m in usual house environment).
- battery life (for doors that are being opened more than 10 times per day like the main entry doors battery on the D026 it’s not going to last more than 2-3 months; however, as it sends also low battery code it will plenty of warning in advance).
In regard of the security there might be some deterrent after all, as Home Assistant can be used to send fake noise on the 433mhz band (either simultaneous with the real device triggering or at specified times/random times during the day) so that it would take a significant amount of time for someone to identify real devices from fake ones. OpenMQTT for instance can also be used to emulate completely random 433mhz device codes. The absence of security would be a major security problem in the case of using 433mhz key fob remotes to arm and disarm house alarm, which most low cost 433mhz alarm systems implement; however, in most cases, for lightning and other smart home usage, 433mhz devices like sensor (open doors/windows, PIR, water leak, smoke) and wireless switches (wall mounted or handheld) should be fine.