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'));

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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