NodeMCU Projects

Micropython

Basics

• Installing:

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

• Connecting via Terminal:

sudo apt install picocom
picocom /dev/ttyUSB0 -b115200

• Connecting 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()

• Checking filesystem:

import os
os.listdir()

• Create directories:

os.mkdir('dir')

• Remove Files:

os.remove('data.txt')

• Writing Data to files:

f = open('data.txt', 'w')
f.write('some data')
f.close()

• Reading data:

f = open('data.txt')
f.read()
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'));

• 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()

Projects

• Playing with GPIO:

import machine
import time
import urandom

pin = machine.Pin(2, machine.Pin.OUT)

def toggle(p):
   p.value(not p.value())

while True:
   time.sleep_ms(urandom.getrandbits(8))
   toggle(pin)

References

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