B4R Tutorials

Charlieplexing - controlling N*(N-1) LED's with N GPIO pins

It is based on this posting. I am using an Arduino Nano to control the 12 LEDs using pins 8, 9, 10, and 11 of the Nano. Just thought it would be interesting to give...
 

Attachments

  • b4rCharliePlexing.zip
    1.1 KB · Views: 671
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Use and change font in rAdafruitGFX for TFT screen

The library rAdafruitGFX is used to draw on TFT screens. It has a default font and does not give a way to change the font for drawing text.
This is what I got when drawing very large characters...
 
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B4R Vibration Sensor (shake switch)

So long that I haven't played with B4R ! Today I want to test a vibration sensor (it's on a closed case yet)
The sensor signals when a sensor shake happens. It's a simple sensor (detected/not...
 

Attachments

  • upload_2019-10-25_11-37-52.png
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  • upload_2019-10-25_11-38-27.png
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[B4X] B4RSerializator - Send and receive objects instead of bytes

B4R v1.50 includes a new type named B4RSerializator (in rRandomAccessFile library).
B4RSerializator solves a difficult and common task. Sending messages with multiple fields to other platforms...
 

Attachments

  • B4RSerializator.bas
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  • B4R_Server.zip
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  • B4A_Client.zip
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Inline C / C++

As in the other B4X tools you can embed C or C++ code in the project.

Example:
B4X: 
Sub Process_Globals
   Public Serial1 As Serial
   Private Result, N1, N2 As Int 'ignore
End Sub

Private Sub...
 
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How to get and parse Json from an Http server, inline C code

Hello,

Since a while i searched to do the same thing i did on an ESP01, but with B4R.
I did it 1st time in Arduino IDE , see the video at bottom, that works well

I searched long time to...
 

Attachments

  • parseJson_InlineC_Domoticz.zip
    4.8 KB · Views: 696
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Check blue tooth communication of your creations

Hi everyone,

Watching tutorials on YouTube I came across this application which allows you to check blue tooth communications. I suppose it will be handy to all of you...
 
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Shrink your arduino project to the minimum

Hi everyone,

Last night I found this guy who explains everything simply and very detailed. Here he explains how to load our Arduino sketch directly (or indirectly) in an ATMega328P-PU...
 
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Car parking position detector

Hi everyone,

This project is a parking detector. It is not my idea and it exists already in Stavros Niarchos Foundation Parking already materialized but it has been a great pleasure analyzing it...
 

Attachments

  • upload_2019-8-17_12-36-45.png
    187.6 KB · Views: 697
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Electronic components pinouts application

Hi everybody,

I found this application on Play Store and it is very useful for prototyping using components...
 
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MAX7219 7-Segment Driver

this is a very simple example shows how to drive 4-digits 7-segment display with MAX7219 and rLedControl library, this code example displays 'HoLA' word, you can add more digits and MAX7219...
 
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Resistance color specs reading - Billy Brown habits

Hi everyone,

Yesterday I watched a video and I would like to share the knowledge accomplished with you. Do you know Billy Brown? Well "Billy Brown Revives On Your Gin But Values Good Whiskey...
 
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Circuit analysis to the maximum

This is a very detailed analysis on circuit analysis comprising of two videos. They are huge videos (1,5 hours almost each) but believe me it worth it seeing them. I faced all these subjects in...
 
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XOR operation for Boolean

Do you have more good solitions; Please share it on my article.
thanks sharings.

B4X: 
'    ----XOR-------
'    A B Output
'    -----------
'    0 0    0
'    0 1    1
'    1 0    1
'    1 1    0...
 
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SevSeg with inline C

This B4R project uses the SevSeg library via inline C to display characters on a 4 digit x 7 segment LED display (I am using a SMA420364L) - hard wired.

The inline C code via the...
 

Attachments

  • b4rSevSegInline.zip
    2.5 KB · Views: 667
  • SevSeg.zip
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IR Control for DSTV Explora Model 2A

This is a sample project for the IR control of the DSTV Explora Model 2A decoder (Digital Satellite TV). The hex codes comes from the B4A project that I have posted here. The B4A...
 

Attachments

  • b4rDSTVexplora.zip
    1.9 KB · Views: 675
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Big/Large Alphanumeric Characters(LCD1602)

The attached project comes from here. Used Inline C to create and display the big/large alphanumeric characters.

I am sure you will figure out how to make use of it (i.e calling and...
 

Attachments

  • b4rLargeAlphaNumeric.zip
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LCD Bar Graph

The attached project mimics this posting. Have added the basic functionality with inline C. It uses the rCore and rLiquidCrystal libraries.

Wiring diagram:


Result...
 

Attachments

  • b4rLiquidCrystalDisplay.zip
    1.5 KB · Views: 729
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Digital Clock and Alarm without using a RTC

A digital clock and alarm without making use of a RTC. It uses:
Uno R3
LCD 1602 (to display the clock and the alarm)
Piezo Buzzer (to sound the preset alarm)
10K Pot (adjust the contrast of the...
 

Attachments

  • JHS_CLOCK.zip
    2.2 KB · Views: 1,124
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8x8 LED Matrix with 788BS

It is based on this Arduino project with the following wiring diagram:



It uses the 788BS 8x8 LED matrix (red) to display numbers/characters/other stuff (without making...
 

Attachments

  • b4rMakeSenseOf8x8LEDmatrix.zip
    1.9 KB · Views: 822
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