I have to flash a TYWE3S module with tasmota. Ive flashed a esp8266 before using 3.3V from an arduino uno. So from what I understand the whole idea behind these 3.3V-5V converters is that these modules are so low power that communication must be done at 3.3V. So I want to check the voltage before doing so, but Im not entirely sure how these converters work.
When I measure 3.3V pin against GND pin I get 3.50V. When I measure 5.0V pin against GND pin I get 5.15V. When I measure Tx or Rx against GND pin I get 5.15V.
So this means this module will fry my TYWE3S?
My USB-TTL cable:
When I measure red Vcc pin against GND pin I get 5.16V When I measure green Tx pin against GND pin I get 3.62V When I measure white Rx pin against GND pin I get 0V