ejs94’s gists

ejs94 / signal_stop.py

Created February 7, 2022 18:41

Using signals to terminate a killable thread.

	import time
	import threading
	import signal

	class Job(threading.Thread):
	def __init__(self):
	super().__init__()
	'''
	The shutdown_flag is a threading.Event object that
	indicates whether the thread should be terminated.

ejs94 / rapid-recording.py

Created August 30, 2021 11:46 — forked from RRMoelker/rapid-recording.py

YUV format picamera real time recording

	# python3
	# based on https://raspberrypi.stackexchange.com/questions/58871/pi-camera-v2-fast-full-sensor-capture-mode-with-downsampling/58941#58941
	import time
	import picamera
	import numpy as np
	from PIL import Image

	RECORD_TIME = 5 # number of seconds to record

	WRITE_IMAGES = False

ejs94 / conda_env_jupyter.md

Last active August 25, 2021 16:46

Using anaconda virtual enviroment inside a jupyter notebook

1 - Show the list of conda virtual environment

conda env list

2 - Create a new virtual environment named trial

conda create --name trial

ejs94 / resize_apriltag.py

Last active October 19, 2022 16:26

I created this script to use python and the pillow lib to increase the size of apriltags, I believe it's easier to adapt than a postscript. You need to change the data in the variables area for desired family and tag, put this in root of the cloned apriltags-imgs repository.

	# ======================================= IMPORTS ====================================#
	'''
	pip install Pillow
	pip install numpy
	'''
	from PIL import Image, ImageDraw, ImageFont
	import glob
	import numpy as np

	# ======================================= VARIABLES ====================================#

ejs94 / raspberry_fast_capture.py

Created July 13, 2021 17:42 — forked from CarlosGS/raspberry_fast_capture.py

Fast reading from the raspberry camera with Python, Numpy, and OpenCV. See the comments for more details.

	# Fast reading from the raspberry camera with Python, Numpy, and OpenCV
	# Allows to process grayscale video up to 124 FPS (tested in Raspberry Zero Wifi with V2.1 camera)
	#
	# Made by @CarlosGS in May 2017
	# Club de Robotica - Universidad Autonoma de Madrid
	# http://crm.ii.uam.es/
	# License: Public Domain, attribution appreciated

	import cv2
	import numpy as np

ejs94 / set_opencv_webcam.py

Created June 29, 2021 12:37 — forked from jwhendy/set_opencv_webcam.py

An example of setting webcam settings via v4l2-ctl in a python script. Some of the CAP_* settings in opencv didn't seem to work.

	import cv2
	import subprocess

	### for reference, the output of v4l2-ctl -d /dev/video1 -l (helpful for min/max/defaults)
	# brightness (int) : min=0 max=255 step=1 default=128 value=128
	# contrast (int) : min=0 max=255 step=1 default=128 value=128
	# saturation (int) : min=0 max=255 step=1 default=128 value=128
	# white_balance_temperature_auto (bool) : default=1 value=1
	# gain (int) : min=0 max=255 step=1 default=0 value=0
	# power_line_frequency (menu) : min=0 max=2 default=2 value=2

ejs94 / how-is-pandas-python-more-powerful-than-excel_webscraping-example.ipynb

Created November 26, 2020 02:13

How is Pandas&Python more powerful than Excel_Webscraping Example.ipynb

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ejs94 / Sizing_Arrays.st

Created July 28, 2020 03:17

Returns the number of elements in an array in structured text (iec 61131-3)

	(* Structured Text (IEC 61131-3) *)
	SIZEOF(Array); // Return size of entire Array in bytes
	SIZEOF(Array[0]); // Return size of one element
	SIZEOF(Array)/SIZEOF(Array[0]); // Return number of elements

	// Example use

	for( i = 0 ; i < SIZEOF(Array)/SIZEOF(Array[0]) ; i++){
	// loop
	}

ejs94 / 11-Tips-And-Tricks-To-Write-Better-Python-Code.py

Created July 8, 2020 03:43

Tips from Python Enginner Youtube Channel

	# 11 Tips And Tricks To Write Better Python Code
	## Source: https://www.youtube.com/watch?v=8OKTAedgFYg
	## Python Enginner

	# 1) Iterate with enumerate() instead of range(len())

	data = [1,2,-4,-3]
	for i in range(len(data)):
	if data[i] < 0:
	data[i] = 0

ejs94 / monte-carlo-simulation-of-stock-prices.ipynb

Created May 20, 2020 01:31

Monte Carlo Simulation of Stock Prices

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Estêvão J. dos Santos ejs94