Arduino Sensors - Gas

 

 

References:

[1] gas sensors MQx https://naylampmechatronics.com/blog/42_tutorial-sensores-de-gas-mq2-mq3-mq7-y-mq135.html

[2] gas sensor MQ135 https://www.tecneu.com/blogs/tutoriales-de-electronica/mq135

[3] gas sensor MQ137 (Ammonia) https://circuitdigest.com/microcontroller-projects/arduino-mq137-ammonia-sensor 

Resources(wifi):

[1] https://mecatronica.saisac.pe/producto/modulo-esp-01-esp8266-wifi/

[2] https://www.electromania.pe/?s=ESP8266&post_type=product

[3] https://www.teslaelectronic.com.pe/producto/modulo-esp8266-serial-wifi/?srsltid=AfmBOoq-9awBhXa6sHpJDswF0XyhD_mICthqr3IEZgQzeOaCFI0GygXP

Setup Arduino IDE

 

avrdude: ser_open(): can't open device "/dev/ttyACM0": Permission denied

$ ls -l /dev/ttyACM* 

crw-rw-r-- 1 root dialout ... /dev/ttyACM0

Fix:

sudo chmod a+rw /dev/ttyACM0 

Resources:

[1] https://www.arduino.cc/en/software/

[2] Simulator https://www.tinkercad.com/ 

Reference Network tools

 

Resources:

[1] https://www.vosviewer.com/download 

[2] https://www.vosviewer.com/documentation/Manual_VOSviewer_1.6.20.pdf

[3] https://api.crossref.org/swagger-ui/index.html  #how to query

How to run on PC/Linux

javaws file.jnlp

If not installed:

sudo apt install icedtea-netx

Linux history issue

 

echo "HISTSIZE=$HISTSIZE"
echo "HISTFILESIZE=$HISTFILESIZE"

#update the .bachrc file
# Keep more commands in memory
HISTSIZE=10000
# Keep more (or unlimited) lines in the history file
HISTFILESIZE=100000
# or for effectively unlimited on Bash ≥4.3:
# HISTFILESIZE=-1

Git issues

Escenary:  You need to upload many files to github, then need to clone, add the files and upload from local, instead file by file.

 

cd Downloads/UnsaTesis/Waste/
ls
mkdir github
cd github
git clone https://github.com/fincahuanaco/solid_waste_peru.git
ls
cd solid_waste_peru/
ls
git add .
git commit -m "Add maps of Lima and Arequipa"
git config --global user.email "you@example.com"
git commit -m "Add maps of Lima and Arequipa" #after added files to directory
git push origin main
git config --global user.email "you@example.com"
git push origin main
git config --global credential.helper store #store credentials on disk
clear
git push origin main
   

Writing tools

Change image size during paper writing (overleaf time compilation affected)

sudo apt install pngquant

pngquant --quality=90-100 budget_map.png  

pngquant --quality=85-95 waste_stress_result.png  #more aggressive

sudo apt install oxipng #does not installed for me
 

Bonus

Cut video using ffmpeg

ffmpeg -ss 00:30:30 -i DAIA-Mat-Sec2-S15.mp4  -c copy DAIA-Mat-Sec2-S15_output.mp4

 

 

 

 

 

Probability and Statistical notes

Books

[1] https://probability4datascience.com/index.html

 

Courses

[1] http://web.stanford.edu/class/cme308/OldWebsite/notes/

Voice enhacer free tools

Resources:

[1] https://voiceenhancer.ai/

[2] https://audioenhancerai.com/

Peruvian social cases

 

Caso Cantuta 90's

[1] https://www.infobae.com/america/peru/2022/07/23/masacre-de-la-cantuta-el-crimen-de-los-estudiantes-a-manos-de-asesinos-encubiertos-en-las-fuerzas-armadas/

[2] https://elpais.com/internacional/2023-05-29/caso-la-cantuta-los-restos-de-las-victimas-que-permanecieron-en-inglaterra-durante-30-anos.html