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Blog entries by andre_luis

  • Featured
andre_luis
1 min read
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4K
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Find bellow an Android TCP client extension that implements a very simple socket; note that its operation is performed 'one-shot', which means that only one command is sent ( and its respective response, read ) at a time, and then the socket connection is closed. So, be aware that it is not a...
andre_luis
2 min read
Views
1K
Uncategorized
The following attached file contains a ThingSpeak client extension that allows one to easily make use of the Read and Write features of the ThingSpeak cloud service provided by MathWorks in such a manner that programmer is able to transparently make use of the service without having to deal...
  • Featured
andre_luis
2 min read
Views
4K
Uncategorized
The following attached file contains an SSH Client extension which I made for my own use, but it may also be useful for users of the MIT Application Inventor 2 (AI2) community, or even to the AppyBuilder community (code intrinsically compatible for the last one, but not tested). This is just the...
andre_luis
1 min read
Views
923
Uncategorized
The following function may be useful for those who are starting in the microcontroller's world and wish to implement applications using 7-segment display with the CCS compiler in PIC platform. I've used long time ago: void Display7seg ( char value ) { char pin=0 ; while ( pin< 8 )...
andre_luis
2 min read
Views
689
Uncategorized
It is a common concern of technicians to adapt equipment manufactured on countries whose frequency of electric public mains differs from its local, so that a modification becomes necessary, but depending on the size of equipment, the cost of the transformer may be the largest when compared to...
andre_luis
Updated
2 min read
Views
3K
Comments
1
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This article is intended to be a quick guide on calculation of transformers used in AC voltage stabilizers which employes series topology. Such model is rarely used in low power equipments due to the relatively more complex control system required for drive the switching devices, but is...
andre_luis
Updated
1 min read
Views
13K
Comments
1
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Equipments such as Inverters and Rectifiers employ power modules as IGBTs, MOSFETs and TRIACs based on compact packages (modules). These components are mounted just above heat sink structure, and unlike PCB based packages, offer the possibility for assemble adopting an alternative approach...
andre_luis
Updated
5 min read
Views
874
Comments
2
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When dealing with displays which haven´t character pattern at desired size, we need to insert character maps in the code program. Once draw entire table is a task somewhat painful, the next step is take a search on the Web for some available map file. However, after find it and put the map on...
andre_luis
Updated
2 min read
Views
868
Comments
2
Uncategorized
Requests for sample C code to deal with a matrix keypad is a recurrent question, what motivated me to share here some tips on an alternative implementation, not so widely employed. This code brings some benefits: Allows reading combinations of multiple keys pressed at same row: 8(4 keys)...

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