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There is a good manager that will help you with all node versions. It's called nvm(Node version manager).

https://github.com/creationix/nvm

All install guides are on git page. I install it like this.

curl -sL https://raw.githubusercontent.com/creationix/nvm/v0.31.0/install.sh -o install_nvm.sh

bash install_nvm.sh

Check to see if everything installed correctly

nvm --version

When the IC is shorted the usual cause is the 7805 regulator is the problem. Just replace the regulator and IC to make it work again.

UPDATE:
Replace the rectifier diode and regulator just to make sure the IC will not be damage. 

After soldering the IC and cool it down. Need to clean using lacquer thinner to avoid short circuit.

Gamitin lagi ang 12v 10amper power supply, para iwas aberya ng vendo.

Pag mag testing ng timer ay wag niyo i grounded ung board sa metal or kamay para hindi mag malfunction pag test.

Fix using

installed telephony version 0.1.1

flutter version 2.10.3

# may/24/2022 14:35:48 by RouterOS 6.40.4
# software id = W8V4-SIVP
#
# model = RouterBOARD 931-2nD
# serial number = 7CBD08915F53
/interface wireless
set [ find default-name=wlan1 ] ssid=MikroTik
/interface ethernet
set [ find default-name=ether1 ] name=1-Globe
set [ find default-name=ether2 ] name=2-Smart
set [ find default-name=ether3 ] name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip pool
add name=dhcp_pool0 ranges=10.0.0.2-10.0.0.254

Pag hindi ka maka connect sa ngrok admin.

This site can’t be reached xxxx-xxx-176-64-191.ngrok.io’s DNS address could not be found. Diagnosing the problem.
DNS_PROBE_POSSIBLE

Ibig sabihin nito kailangan niyo palitan ung DNS sa ip settings sa computer/phone mo. Iset niyo lang ang DNS

Uploading flutter android sdk 31 version makes an error on google play store.

You uploaded an APK or Android App Bundle which has an activity, activity alias, service or broadcast receiver with intent filter, but without 'android:exported' property set. This file can't be installed on Android 12 or higher. See: developer.android.com/about/versions/12/behavior-changes-12#exported

memory leak error/warning

This error might indicate a memory leak if setState() is being called because another object is retaining a reference to this State object after it has been removed from the tree. To avoid memory leaks, consider breaking the reference to this object during dispose().

Just add this line of code before calling the setstate.

if (!mounted) {
  return;
}
// your setState here

Steps pano maka access online sa wifi ng bayan vendo:
1. Register ka muna sa ngrok website(https://dashboard.ngrok.com/signup) pra maka kuha ng authentication token


2. Once maka login kana sa ngrok, copy niyo ung authentication token sa ngrok account.

Pag ung pisowifi pag connect mo is naka connecting lang lagi, obtaining IP ADDRESS pag check mo sa settings ng phone mo. Possible problema:
1. Check natin ung USB TO LAN baka nasira or nag malfunction na. Palitan lang natin ng bago and make sure ung bago is tested na working.

2. Pag hindi padin nag work, icheck natin ung utp cable from USB TO LAN (gamitin muna nating ung bago hindi ung luma para maka sigurado tayo na working ung USB TO LAN).

I have spent so many hours just to figure this out. I use wss(secure) for my django websocket. Ive realized that using firebase and firecamp is working perfectly, but in my flutter app websocket connect it does not work. arggg, spending many hours working this error (I initially dont know why the heck is this).

Adding this piece of code in the main.dart file fix my issue. :)

It cause warning error because because of building the widget when the entire widget is not yet build. I added this certain code to wait, after it will rebuild the widget I created in initState.

Add this line of code inside your stream listen function, under initState.

Adding database access in consumers.py

using AsyncWebcocketConsumer to add database access instead of using WebsocketConsumer, this is base on the channels tutorial.

Using Token as authentication for websocket

Version:

        django == 4.0.3
        channels == 3.0.4
    

Important notice: must declare first before, AuthMiddlewareStack.

import os
import django

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myapp.settings')

django.setup()

from channels.auth import AuthMiddlewareStack
    

1.Add middleware.py in your django app.

Create daphne ASGI

must allow whatever port you set

Prerequisite:

1.Can run gunicorn on your env

gunicorn --bind 0.0.0.0:9001 myapp.wsgi

sudo apt install certbot python3-certbot-nginx

Create multiple django site for subdomain1 and subdomain2, using gunicorn + nginx + systemd | DigitalOcean.

1.Make sure you already installed the gunicorn on your django env

pip install gunicorn

2.Create new socket file on

sudo nano /etc/systemd/system/gunicorn_subdomain1.socket

When doing http request testing in production. Don't forget to add HTTPS prefix.

Need to restart application from namecheap cpanel to take effect the changes from

models.py.

python manage.py makemigrations

python manage.py migrate

find . -path "*/migrations/*.py" -not -name "__init__.py" -delete

find . -path "*/migrations/*.pyc"  -delete

Follow this article: https://umar-yusuf.blogspot.com/2020/04/setting-up-django-project-and-app-on.html

don't forget to add  'django.contrib.sites' in INSTALLED_APPS.
Also add ALLOWED_HOST = ['your_domain'].

If there an error site not exist:

Here is my 2nd flutter(version 2.2.1) app repo: https://github.com/boilinux/flutter-spending-tracker

Here is my flutter(version 2.2.1) first app repo: https://github.com/boilinux/flutter-my-first-app

Base on youtube tutorial.
source: https://www.youtube.com/watch?v=x0uinJvhNxI

If you experience na ung allan coinslot niyo is hindi mag accept ng coins or nag mamalfunction.
TRY THIS FIX, Lagyan niyo lng ng black ink/paint ung sa may sensor para mag block sa mga noise light surrounding. Ung black ink/paint gamit niya pra mag focus lng sa light nong LED ng sensor.

HOPE THIS WILL HELP YOU :)

My problem was the network was running so slow to detect.

This is my pc specs:

I reduce the time for this to process to save time at boot.
I edited networking.services

sudo nano /etc/systemd/system/network-online.target.wants/networking.service

Change

TimeoutStartSec=5min

To

TimeoutStartSec=2s

Then reboot.

Alright Dota 2 perfectly working on my Ubuntu 18.04LTS ( AMD PC ). 

If you have created your own circuit which run from a microcontroller. You want to control your appliances, motor or any AC load. You probably notice some issue regarding a relay when you control the AC load.

When there is no load in the relay, the circuit runs fine. Now what if we put some load in the relay like a motor. You might notice that the circuit has some issue like it will reset itself or some abnormalities from the circuit.

This where the RC snubber is very important, you just put a RC snubber to the output of the relay. Just what I did in my circuit.