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…
IoT Made Easy With UNO, ESP-01, ThingSpeak and MIT App Inventor
How to Scan, Fake & Attack Wi-Fi Networks with the ESP8266-Based
September 2018 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
JBtek 4 Channel DC 5V Relay Module for Arduino
Arduino Portenta Hat Carrier - Raspberry Pi extension for Arduino
October 17, 2016 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
September 2022 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
August 7, 2018 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
October 6, 2016 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
GeeekPi 2-Pack I2C 1602 LCD Display Module 16X2 Character Serial