NodeMCU Config

From Network Security Wiki


Micropython

Installation

  • Flashing Micropython

Download firmware file from micropython.org 

sudo pip install esptool
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 ~/Desktop/esp8266-20171101-v1.9.3.bin
  • Check the firmware integrity:
import esp
esp.check_fw()

Connecting

  • Via Terminal:
sudo apt install picocom
picocom /dev/ttyUSB0 -b115200
  • Via REPL(web):
import webrepl_setup
  • If you disabled automatic start-up on boot, you may run configured daemon on demand using:
import webrepl
webrepl.start()
  • Upload data using Serial Port
sudo pip install adafruit-ampy
ampy --port /dev/ttyUSB0 put ~/Desktop/main.py

File System

  • Checking filesystem:
import os
os.listdir()
  • Create directories:
os.mkdir('dir')
  • Remove Files:
os.remove('data.txt')
  • Reading data:
f = open('data.txt')
f.read()
f.close()
  • Writing Data to files:
f = open('data.txt', 'w')
f.write('some data')
f.close()
  • Checking Machine Frequency & Overclocking:
import machine
machine.freq()                # get the current frequency of the CPU
machine.freq(160000000)       # set the CPU frequency to 160 MHz
  • Check AP Name:
import network
ap = network.WLAN(network.AP_IF)
print(ap.config('essid'))
  • Change AP name and password:
import network
ap = network.WLAN(network.AP_IF)
ap.active(True)
ap.config(essid='MyESP8266', authmode=network.AUTH_WPA_WPA2_PSK, password='mypassword')
print(ap.config('essid'))
  • Turning off AP:
ap = network.WLAN(network.AP_IF)
ap.active(True)

Boot Process

As a final step of boot procedure, main.py is executed from filesystem
This file is a hook to start up a user application each time on boot (instead of going to REPL). 
For small test applications, you may name them directly as main.py
but instead it’s recommended to keep your application(s) in separate files, and have just the following in main.py:

import my_app
my_app.main()

Deep-sleep mode

  • This shut down the ESP8266 and all its peripherals & also WiFi.
  • But not including the real-time-clock, which is used to wake the chip.
  • This drastically reduces current consumption and is a good way to make devices that can run for a while on a battery.
  • You Must connect GPIO16 to the reset pin.
import machine

# configure RTC.ALARM0 to be able to wake the device
rtc = machine.RTC()
rtc.irq(trigger=rtc.ALARM0, wake=machine.DEEPSLEEP)

# check if the device woke from a deep sleep
if machine.reset_cause() == machine.DEEPSLEEP_RESET:
    print('woke from a deep sleep')

# set RTC.ALARM0 to fire after 10 seconds (waking the device)
rtc.alarm(rtc.ALARM0, 10000)

# put the device to sleep
machine.deepsleep()



References





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