Debug Emacs Lisp with Edebug & Debug

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Programming in Emacs Lisp – Debugging After using Emacs for over 4 years, I am still feeling like scratching the surface of the functionalities of this feature-laden editor. It is a text editor with so many extensions that can do almost anything you want with flexibility and customizability.

There are two ways to debug elisp code: debug and edebug.

debug

These are 4 common entry points (ways to use it): ...

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Covid-19 data (USA) Interactive Display with R and Shiny Package

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Preamble

Shiny is an R package that makes it easy to build interactive web apps from R. This is an example demonstrating the dynamic distribution of Covid-19 data in USA.

The data source used for this analysis is the 2019 Novel Coronavirus COVID-19 (2019-nCoV) Data Repository1 built the Center for Systems Science and Engineering, Johns Hopkins University (GitHub – CSSEGISandData/COVID-19: Novel Coronavirus (COVID-19) Cases, provided by JHU CSSE). ...

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Arduino TFT LCD GUI – Load Bitmap Image

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Preamble

There are two ways to draw bitmap images in Arduino TFT LCD – to draw from SD card, or convert them into byte array. The first is more powerful and works with true color bitmap images; the 2nd approach is more suitable for simple logo and monochrome images, and there is no need for SD capability for this method.

Convert Images to C++ Byte Array

There are a ...

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How to Make a GUI for Arduino TFT LCD

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Preamble

There is no package available which offeres a visual graphic display as well as the coordinate info so that you can reproduce it with TFT graphic library. 4D Systems is the closest you can get, yet it is lousy, proprietary and only available for Windows. After researching long and hard for a GUI Designer for Arduino TFT LCD, finally I think I come up with a reasonable implementation – SVG vector ...

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