B4R Tutorials

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...

 

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...

 

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...

 

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

Example:

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

Private Sub...

 

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...

 

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...

 

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...

 

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...

 

Hi everybody,

I found this application on Play Store and it is very useful for prototyping using components...

 

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...

 

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...

 

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...

 

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

'    ----XOR-------
'    A B Output
'    -----------
'    0 0    0
'    0 1    1
'    1 0    1
'    1 1    0...

 

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...

 

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...

 

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...

 

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

Wiring diagram:

Result...

 

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...

 

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...

 

Here's nother example how to use RSA on a ESP32 based on this documentation:

https://tls.mbed.org/kb/how-to/encrypt-and-decrypt-with-rsa

Notes:

- If the filesystem does not work, you need...