NodeMCU v2 and v2.1 high resolution pinout and specs

by Renzo Mischianti · Published 27 October 2021 · Updated 20 August 2024

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NodeMCU v2 and v2.1 (esp8266) details

The NodeMCU project begins in October 2014 shortly after the release of Espressif Systems’ ESP8266 module, when Hong releases the first files of the future NodeMCU firmware on GitHub. Two months later, the project expanded to include a free hardware platform developed by Huang R released with a Gerber extension called “Devkit v0.9”.

You can find It here WeMos D1 mini - NodeMCU V2 V2.1 V3 - esp01 - esp01 programmer

Specs

Processor: L106 32-bit RISC microprocessor core based on the Tensilica Xtensa Diamond Standard 106Micro running at 80 MHz
Memory:
- 32 KiB instruction RAM
- 32 KiB instruction cache RAM
- 80 KiB user-data RAM
- 16 KiB ETS system-data RAM
External QSPI flash: 4 MiB
IEEE 802.11 b/g/n Wi-Fi
- Integrated TR switch, balun, LNA, power amplifier and matching network
- WEP or WPA/WPA2 authentication, or open networks
16 GPIO pins
SPI
I²C (software implementation)^[6]
I²S interfaces with DMA (sharing pins with GPIO)
UART on dedicated pins, plus a transmit-only UART can be enabled on GPIO2
10-bit ADC (successive approximation ADC)