7/10/2023 0 Comments Esp8266 serial port![]() The ESP8266 has 17 GPIO pins (0-16), however, you can only use 11 of them, because 6 pins (GPIO 6 - 11) are used to connect the flash memory chip. The maximum current that can be drawn from a single GPIO pin is 12mA. The pins are not 5V tolerant, applying more than 3.6V on any pin will kill the chip. ![]() The ESP8266 is a 3.3V microcontroller, so its I/O operates at 3.3V as well. As the name implies, they can be used as digital inputs to read a digital voltage, or as digital outputs to output either 0V (sink current) or 3.3V (source current). Just like a normal Arduino, the ESP8266 has digital input/output pins (I/O or GPIO, General Purpose Input/Output pins). In this chapter, we’ll look at the non-Wi-Fi specific functions of the ESP8266. While the ESP8266 is often used as a ‘dumb’ Serial-to-WiFi bridge, it’s a very powerful microcontroller on its own. Download examples The ESP8266 as a microcontroller - Hardware
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