Wemos D1 pins

GiovanniG11:
Ok can be strange, but why (for exmple) D13 and D5 command activate both two ports? Amazing..
Other way to test outputs?

because it is strange. :slight_smile: but it has it's logic:

the SPI pins of esp8266 are mapped to pins where SPI is on Uno (D10, D11, D12, D13). but then no enough pins would be left for the first section of D pins.

and 4 and 5 as default I2C pins in esp8266 Wire library. they are connected to I2C pins SDA and SCL where they should be for shields (on the header next to usb connector). they are on Uno twice too (A4 and A5)