What is the maximum input voltage value of esp8266 vin.Does it work with 4.5 volts?
I usually check stuff like that on the randomnerdstutorial website. It's a 3.3V board. If you connect to the pin with the VR then up to 6v.
Reading datasheets opens the future in a lots of aspects for all kinds of circuits.
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It completely depends on the circuit of your board, especially the voltage regulator. There are hundreds of Esp8266 boards, so no-one can surely answer if you don't give details.
4.5V on VIN quite likely works, but again, depends on the components used...
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What is the color of your neighbor's cozen wife's shoes? That would be easier to answer then what you are asking. Realize we cannot see, touch, feel or any other way of understanding what you are talking about.
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Probably about 3.6V. 4.5V would fry it.
But are you asking the right question?
Maybe the question you meant to ask was "what is the maximum input voltage of the ESP8266-based development board I have?"
The answer would be, of course, we don't know, because you didn't say which board it is. Development boards usually have a voltage regulator which will accept a range of input voltage and output the 3.3V that the ESP8266 requires.
But different development boards have different voltage regulators with different limits.
Some boards like NodeMCU have AMS1117-33 regulators which can accept input voltages between about 4.5V and 12V.
Other boards like Wemos D1 mini have low drop-out regulators which can accept input voltages of around 3.5V and 5.5V. This range is more limited, but may be more suitable for battery powered projects.
"Vin" always points to a pin on a development board, not to the ESP module itself.
So what board do you have.
Leo..
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