source : https://oitibs.com/how-to-access-zentyal-mysql/
Open the file located at /var/lib/zentyal/conf/zentyal-mysql.passwd and take note of the password.
Removing epoxy packaging from chips
source : https://www.youtube.com/watch?v=mT1FStxAVz4&list=WL&index=1
- Using machine remove the top packet
- In Room temperature put a drop or two of fuming nitric acid into the milled packet and waited for a while
- Put the IC on the hot plate, like ceramic container. Around 100 degree C for speed up reaction.
- keep put a drop acid on the ICs top when acid evaporation.
- Use Acetone clean the Chips.
Manuel SQL backup for ISPConfig by command line
Version 3.1.x
The following command will start cron job backup in advance.
command: cron_debug.php
php /usr/local/ispconfig/server/cron_debug.php --cronjob=500-backup.inc.php
Version 3.2.x
command: backup-now.php
Usage:
php backup-now.php --id=<4> [--type=]
Options:
--id id of the website to backup.
--type backup type: all, web or mysql. Default is all.
php /usr/local/ispconfig/server/backup-now.php --id=1 --type=mysql
Top 10 Most Powerful Aircraft Engines In The World (2021)
Source: The Buzz(2021), https://www.youtube.com/watch?v=38J9g5aAP48
ESP32 Beginning research
ESP32 have 3 choice :
1. Chip level
2. Module level (include ESP32 Chip, include antenna, SMT PCB connection pin)
3. Development kit (include ESP32 Module, USB port, PCB solder connection pin)
制冷方式
以下內容，只為研究用途，未經核實考證。
斯林特制冷 Stirling refrigerator
渦流管制冷 vortex tube refrigeration
燒煤製冷（蒸氣噴射製冷）Steam jet cooling system
空氣動力學 Aerodynamics
停止在Arduino使用 Serial.print，用其他方法更好
#define DEBUG 1
#if DEBUG == 1
#define debug(x) Serial.print(x)
#define debugln(x) Serial.println(x)
#else
#define debug(x)
#define debugln(x)
#endif
void setup() {
Serial.begin(9600);
debugln("Setup complete");
}
如何查詢電腦的主板形號？
Aluminum
4874G = 517 CANS