Strav's blog

Info about the Reolink Video Doorbell
New Reolink Wired POE Doorbell Cam

Linking to mechanical chime
Reolink Video Doorbell with Standard Electro/Mechanical Chime Guide
Modify Reolink Doorbell to keep original chime box
ReoLink Doorbell; Original House Chimebox RESTORED! [pics, vid, code]
Example Picture
Interface Two Channel Relay Module with Arduino

433 MHz Info
Complete Guide for RF 433MHz Transmitter/Receiver Module With Arduino