If you need lots of Relays to switch, the 16 channel relay board(above) that is available at various Chinese webshops seems like a good idea, and in fact it is if you use 5Volt logic. It is a complete different matter if you like to use it with a 3v3 system such as the raspberry…
November 26, 2019 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
ESP8266 NodeMCU Relay Module - Control AC Appliances (Web Server
Schematic Review Request: ESP-01 16 Channel Relay Controller : r
Teyleten Robot DC 1 Channel Optocoupler 3V/3.3V Relay High Level
ESP32 Troubleshooting Guide
Red working status indicator.
5V-24V Relay Module 1-8 Channel Raspberry Pi ESP8266 ESP32 Optocoupler
Raspberry Pi - Pico
What Next For The SBC That Has Everything?
Not the cleanest, but it finally works! : r/raspberry_pi
JBtek 4 Channel DC 5V Relay Module for Arduino