ESP8266 Community Forum

- Tue Aug 14, 2018 2:40 pm #77735 I haven't actually bought an esp module yet, but I am probably going to. For my project, I'm thinking that the number of available gpio pins might be an issue. I am looking at the esp-12 for its low cost and comparably large pin count. I have serial converters and voltage regulators and all that stuff. I've read that gpio15, gpio2 and gpio0 need to be pulled certain ways for normal operation. But once I have the pullup and pulldown resistors in place, can I set those pins as OUTPUTS in the arduino firmware (which I intend to flash)? Will they work fine as log as I keep in mind that some are pulled in unusual directions? I believe I read somewhere that they only need to be pulled to VCC and GND when It boots up, so by the time arduino has control over anything, are those pins fine to use?