ESP8266 Community Forum

kenn wrote:The trick is how to reasonably use those last GPIOs without requiring complex outboard circuitry to manage the startup conditions.

That's only depends how you use them. For example, I'm using GPIO2/GPIO0 for an I2C bus, so since I2C bus requires Pull-Ups, that just fine because those PullUps are also required for Normal Boot.

martinayotte wrote:

kenn wrote:The trick is how to reasonably use those last GPIOs without requiring complex outboard circuitry to manage the startup conditions.

That's only depends how you use them. For example, I'm using GPIO2/GPIO0 for an I2C bus, so since I2C bus requires Pull-Ups, that just fine because those PullUps are also required for Normal Boot.

Then you figured out the trick

kenn wrote:Then you figured out the trick

The trick for GPIO15 is probably (but I didn't try it) is driving a LED to GND, since this pins requires a PullDown.

This is my board 4 output 2 input and 1 sensor pin it has a pull up res just a trick as you said.I wrote android app for module ı use udp server using lua .