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NodeMCU Introduction

Documentation

Flashing Firmware via ESPtool

  • Github ESPtool
  • python esptool.py -p /dev/ttyUSB0 write_flash -fm dio 0x00000 nodemcu-master-14-modules-2017-04-15-15-39-12-integer.bin

Arduino-IDE

GPIO

D1 mini label ESP-8266 Pin NodeMCU - index
D8 GPIO 15 8
D7 GPIO 13 7
D6 GPIO 12 6
D5 GPIO 14 5
D0 GPIO 16 0
A0 A0 Analog input
D4 GPIO 2 4
D3 GPIO 0 3
D2 GPIO 4 2
D1 GPIO 5 1

Known Problems

Udev rule Debian-testing

  • without this rule a non-root user, regardless is he is a member of dialout or not, can't execute 
    screen /dev/ttyUSB0

    or use the arduino ide on debian-testing

  • get all information using 
    udevadm info -a -n /dev/ttyUSB0

    this yields the following output 

     
looking at device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/ttyUSB0/tty/ttyUSB0':
    KERNEL=="ttyUSB0"
    SUBSYSTEM=="tty"
    DRIVER==""

  looking at parent device '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/ttyUSB0':
    KERNELS=="ttyUSB0"
    SUBSYSTEMS=="usb-serial"
    DRIVERS=="ch341-uart"
    ATTRS{port_number}=="0"

    ATTRS{idProduct}=="7523"
    ATTRS{idVendor}=="1a86"
    ATTRS{ltm_capable}=="no"
    ATTRS{maxchild}=="0"
    ATTRS{product}=="USB2.0-Serial"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="removable"
    ATTRS{speed}=="12"
    ATTRS{urbnum}=="173"
    ATTRS{version}==" 1.10"
  • creating a udev rule in 
    /etc/udev/rules.d

    named 

    30-wiffy.rules

    with the following content 

    SUBSYSTEM=="tty", SYSFS{idVendor}=="1a86", SYSFS{idProduct}=="7523", ACTION=="add", GROUP="dialout", MODE="0664", SYMLINK+="wiffy"
  • now you can access your nodemcu via 
    screen /dev/ttyUSB0 115200