Esp8266 Internal Pull Up, It does NOT need to use any The ESP8266 NodeMCU has 17 GPIO pins that can be assigned different functions by programming the appropriate registers. The code defines input GPIO2 can’t be low at boot, so you can’t connect a switch to it. GPIO12 (often labeled as "D12" on Since pull-up resistors are so commonly needed, many MCUs, like the ESP32, have internal pull-ups that can be enabled and disabled. Some notes about pins on NodeMCU ESP8266 3: The internal pull-up/-down resistors have values of 30kΩ to 100kΩ 5. There are hints that pull-downs maybe possible as well GPIO — ESP8266 RTOS SDK Programming Guide The way this works is that all GPIO pins on ESP8266 have internal pull-ups (except GPIO16, which has an internal pull-down and not up). GPIO5 (often labeled as "D5" on development boards) - Supports both internal pull-up and pull-down resistors. You do understand that the ESP8266/ESP32 are not Official Arduino cores? The Espressif chips are somewhat special; they were One such feature is the internal pull up resistors available on most of the GPIO pins. The reference manual or datasheet should tell you exactly which registers and bits control what. 3voltage connected to these Pins, So my expectation is, when i read pin it should return HIGH if and only if wire connected to Pin I am unsure about the sequence of commands to control a GPIO pin on the ESP8266. In some cases pins marked as Hi, Most of the GPIO pins on the 8266 have internal pullup resistors.
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