Month: August 2018

The ESP8266 has a current limit of 12ma, so we have to take care when driving relays. First I start with a 817C Optoisolator. The datasheet says says the IR LED drops 1.2v, so I plug 3.3v source voltage, 1.2v

Many ESP8266 12E Boards come with Arduino style pin numbers labeled on the boards, but you use the GPIO pin numbers in your code. If you include the following lines of code in your sketch before setup(), you can use