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[Firebase] Free web

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- May 31, 2020

We can create free webhosting using firebase. This is really nice and easy. Take a look the youtube link below.

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[Version] How to check version of each application or OS

- February 01, 2020

1. CentOS Use any command: > cat /etc/os-release > hostnamectl > rpm -qa centos-release > $ uname -r 2. Node > node -v 3. NPM > npm -v 4. Angular > ng -v 5. Node package > ng -v

[HTTPS] on centos using letsencrypt (Free SSL)

- February 01, 2020

Right now, chrome browser will verify trusted ssl. If you use any ssl cert, it will show some warning which make users feel uncomfortable. Let's see which ssl we can use for free. I have a chance to try one cert authority names 'Let's encrypt' Please see the instructions how to use it. My Environment 1. CentOS 7 Step 1. Install certbot client. https://certbot.eff.org/ wget https://dl.eff.org/certbot-auto sudo mv certbot-auto /usr/local/bin/certbot-auto sudo chown root /usr/local/bin/certbot-auto sudo chmod 0755 /usr/local/bin/certbot-auto 2. Run certbot sudo /usr/local/bin/certbot-auto certonly --standalone https://certbot.eff.org/docs/install.html 3. Put your public and private key into secured folder e.g. /etc/letsencrypt/live/... 4. Run automatic renewal echo "0 0,12 * * * root python -c 'import random; import time; time.sleep(random.random() * 3600)' && /usr/local/bin/certbot-auto renew" | sudo tee -a /etc/cron...

M5Stack ESP32

- December 25, 2018

1. use uPyCraft https://randomnerdtutorials.com/install-upycraft-ide-windows-pc-instructions/ 2. Tools > Burn Firmware - m5stack-20180516-v0.4.0.bin Connect to Putty 1. Open Putty 2. Select 'Serial' Connection 3. Port: COM7, Speed 115200 4. exec(open('./main.py').read(),globals()) M5Cloud How to make it connect to wifi 1. Burn with M5Cloud firmware https://github.com/m5stack/M5Cloud/tree/master/firmwares 2. Connect to wifi using http://192.168.4.1/ 3. Add device via http://io.m5stack.com M5 UI-Flow 1 Instruction https://medium.com/mmp-li/m5stack-with-ui-flow-b6d1a37385b0 1.1 How to burn firmware https://docs.makerfactory.io/m5stack/related-documents/burn-firmware/ 1.2 M5Burner https://github.com/m5stack/M5Stack-Firmware Arduino 1 Install Arduino IDE - [1] arduino ide - [2] arduino on vscode 2. Install ESP32 board on Arduino IDE https://randomnerdtutorials.com/installing-the-esp32-board-...