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I have esp12F that programmed with USB-TTL from arduino IDE

The wires setup during program is running

USB->ESP12F

RX->TX

TX->RX

3V3->VCC

GND->GND

While on GPIOs of ESP12F

RST->VCC

CH_PD->VCC

GPIO 0->VCC

GPIO 15->GND

When i touch the ESP12F, i feel my thumb so warm and the feel like little near iron temperature. I dont have termometer. So i just tell what i feel, what im afraid is that hot state is indicating short circuit but i'm sure there's no short at there. If short, the blink program wouldn't blinked, the fact it's blinking. I'm not using any resistor for it, i'm just directing connect using cable jumper.

Or should i think that hot is a normal? Due to current that stuff needs?

Also im wonder are GPIOs on ESP12F is 5V tollerant? I have read many article, they are have different question that make me confused.

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It's absolutely normal for an ESP to become warm a little bit, especially if wifi is active. If the metal shielding gets up to 30 or maybe 40 degC I wouldn't worry too much. I suggest you measure the current/power consumption. From my experience, an ESP in a typical application (wifi enabled, some peripherals like LEDs or transistors attached) draws around half a watt. When I power my ESP-based boards for the first time, that's what I measure to have an idea if there's something wrong.

And no, the IOs are not 5V tolerant.

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