ce current).</p>
   <h4>Voltage and current restrictions</h4>
   <p>The ESP8266 is a 3.3V microcontroller, so its I/O operates at 3.3V as well. The pins are <strong>not 5V tolerant, applying more than 3.6V on any pin will kill the chip.</strong></p>
   <p>The maximum current that can be drawn from a single GPIO pin is <strong>12mA</strong>.</p>
   <h4>Usable pins</h4>
   <p>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 m