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Optical coupling isolation
Do not use a vacuum cleaner for cleaning
make sure to dry it properly
remove the backing paper from the self-adhesive pad on the base of the heatsink
USB to UART ESP-01 CH340 Programmer pH/Turbidity/Flow Optical coupling isolationUSB to UART ESP 01 CH340 Programmer The USB to UART ESP8266 Adapter Programmer for ESP 01 WiFi Modules with CH340G Chip converts the signal from a USB interface to a PC laptop to match a serial module ESP8266. ESP 01 serial wifi module can be directly plugged into the yellow pin header without any connecting wire. This converter module has a CH340 chip which is reliable and high performance. It is compatible with most Windows systems. The adapter
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