SDIO Pins ESP8266 features Secure Digital Input/Output Interface (SDIO) which is used to directly interface SD cards. Up to 80 MHz and the divided clocks of 80 MHz.4 timing modes of the SPI format transfer.These SPIs also support the following general-purpose SPI features: SPI Pins ESP8266 features two SPIs (SPI and HSPI) in slave and master modes. However, UART1 (TXD1 pin) features only data transmit signal so, it is usually used for printing log. ![]() UART0 (TXD0, RXD0, RST0 & CTS0 pins) can be used for communication. UART0 and UART1, which provide asynchronous communication (RS232 and RS485), and can communicate at up to 4.5 Mbps. UART Pins ESP8266 NodeMCU has 2 UART interfaces, i.e. However, they cannot be implemented at the same time. Testing power supply voltage of VDD3P3 pin and testing input voltage of TOUT pin. The two functions can be implemented using ADC viz. When configured as an input, it can also be set to edge-trigger or level-trigger to generate CPU interrupts.ĪDC Channel The NodeMCU is embedded with a 10-bit precision SAR ADC. Each digital enabled GPIO can be configured to internal pull-up or pull-down, or set to high impedance. GPIO Pins ESP8266 NodeMCU has 17 GPIO pins which can be assigned to various functions such as I2C, I2S, UART, PWM, IR Remote Control, LED Light and Button programmatically. It should be noted that I2C clock frequency should be higher than the slowest clock frequency of the slave device. I2C interface functionality can be realized programmatically, and the clock frequency is 100 kHz at a maximum. ![]() Both I2C Master and I2C Slave are supported. I2C Pins are used to hook up all sorts of I2C sensors and peripherals in your project. GND is a ground pin of ESP8266 NodeMCU development board. These pins can be used to supply power to external components. The 3.3V pins are the output of an on-board voltage regulator. The VIN pin can be used to directly supply the ESP8266 and its peripherals, if you have a regulated 5V voltage source. Power Pins There are four power pins viz. For the sake of simplicity, we will make groups of pins with similar functionalities.
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