a 555 replacement based on the ESP-01 ESP8266 board. [TechColab] began by investigating existing ESP-01 solid-state relay boards but found that many of them momentarily enable the output on ...

The ESP-01 launched the ESP8266 revolution back in 2014, and while today you’re far more likely to see somebody use a later version of the chip in a Wemos or NodeMCU development board ...