Switch big loads with a microcontroller | Relay module & integrated darlington | Cybergarden part 4

To switch big loads reliably with any microcontroller such as ESP32, ESP8266, Arduino or Raspberry Pi need something in between your GPIO and your load. While an ordinary relay is a solution, a relay in combination with a darlington array is much better. Why? How to build a relay card? Check out this video and in case you're missing some prior knowledge, make sure to watch the basics videos first: