NodeMCU - lvidarte/esp8266 GitHub Wiki
NodeMCU is an open source IoT platform based on the ESP‐12E module. The version 1.0 is the 5th design of NodeMCU devkit. This uses CP2102 as UART bridge, and can flash firmware automatically by using nodemcu-flasher. Also it has a voltage regulator to convert from 5v to 3.3v which is the required by the esp21e module.
Dimensions: 25 x 48 mm
The term "NodeMCU" by default refers to the firmware rather than the dev kits. The firmware uses the Lua scripting language.
NodeMCU pinout
https://raw.githubusercontent.com/lvidarte/esp8266/master/nodemcu_pins.png
Comparison Table
| NodeMCU v1.0 | Arduino MKR1000 | Particle Photon | |
|---|---|---|---|
| Microcontroller | ESP-12E module, with Espressif ESP8266 32bits | ARM Cortex M0+ 32bits | ARM Cortex M3 32bits |
| Clock Speed | 80/160MHz | 48MHz | 120MHz |
| Board Power Supply | 5V | 5V | 5V |
| Circuit Operating Voltage | 3.3V | 3.3V | 3.3V |
| Flash Memory | 4MB | 256KB | 1MB |
| SRAM | 64KB | 32KB | 64KB |
| EEPROM | No | No | Emulated |
| Digital I/O Pins | 10 | 8 | 18 |
| PWM Pins | 10 | 12 | 9 |
| Analog Input Pins | 1 (ADC 10 bit) | 7 (ADC 8/10/12 bit) | 8 (12 bit) |
| Analog Output Pins | 1 (DAC 10 bit) | 2 (12 bit) | |
| Connectivity | IEEE 802.11 b/g/n Wi-Fi | IEEE 802.11 b/g/n Wi-Fi | IEEE 802.11 b/g/n Wi-Fi |
| Antenna Type | PCB | PCB | PBC and uFI |
| Supported Battery | No | Li-Po single cell, 3.7V, 700mAh minimum | No |
| UART | 1 (+ TX only on pin GPIO2) | 1 | 1 |
| SPI | 2 | 1 | 2 |
| I2C | 1 | 1 | 1 |
| LED builtin | D0 / GPIO 16 | GPIO 6 | D7 |
| Programming Languages | C++ / Python / Lua / Javascript | C++ | C++ |
| Flashing | Locally / OTA | Locally / OTA | Over the Web IDE / OTA |
| Cost | $4.30 | $32 | $19 |
ESP8266 vs ATMega328 (Arduino UNO, Nano, Pro Mini)
| ESP8266 | ATMega328 | |
|---|---|---|
| Manufacturer | Espressif | Atmel |
| Architecture | 32-bit RISC | 8-bit AVR RISC |
| Clock Speed | 80 MHz | 16 MHz |
| Maximum operating frequency | 160 MHz | 20 MHz |
| Flash Memory | External (512Kb-4MB) | Internal (32Kb) |
| Connectivity | IEEE 802.11 b/g/n Wi-Fi | No |
| Operating Voltage | 3.3v | 3.3v or 5v |
| Digital I/O Pins | 10 | 22 |
| PWM Output | 10 | 6 |
| Analog Pins | 1 | 6 |