I have different versions of modules and I noticed when I apply +3.3 to CH_PD pin and is not connected to Wi-Fi board start heating. When I connect to WI-FI network - heating stops... Also board is heating when I transfer data on speed more than 115200 UART speed...
I do not use any pullup or pulldown on CH_PD pin(tried pullup which stm32 MCU offer - no difference)
Is it normal behavior?
Heating issues
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metalheart
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