you will only see a blue LED flash for a while when the power is applied. In terms of programming we should understand the relay is controlled by the ESP-01 module thru port GPIO0. The relay is ...

If we set GPIO0 low, however, the boot ROM inside the ESP8266 takes over and it begins communicating over the UART. Using this boot ROM we can push our programs to the flash memory. A good way to ...

more Flash, and more GPIOs. How much, you’re probably asking yourself. It’s a dollar more than the ESP8266. The datasheet for the module goes over all the gritty details. While this chip has ...