What do you mean by no USB? There is a CH340C uart to USB chip onboard and a mic...

		gramsejr on Sept 18, 2020 \| parent \| context \| favorite \| on: We made an open source ESP8266 dev board for maker... What do you mean by no USB? There is a CH340C uart to USB chip onboard and a micro usb port. Is there something specific you're looking for? The relay would just be used as a switch to turn on/off an external device using higher voltages, AC or DC.