B4R Tutorials

The following data types are available in B4R:

Numeric types:

Byte: 0 - 255
Int (2 bytes): -32768 - 32768. Similar to Short type in other B4X tools.
UInt (2 bytes): 0 - 65535.
Long (4 bytes)...

 

With this tool you can create Arduino and B4R code to be played in a passive Buzzer. You just play the song in the piano and the code is created automatically. When you play the last note leave it...

 

With the rSoftwareSerial library you can turn regular pins to serial ports. This is useful as the hardware serial is used...

 

Hi guys
I want to share my project on this great community (source code free no donation)
I think it may be useful to someone
in the source code I commented out the functions
it should be simple...

 

Battery Life Calculator

If you want to know how many hours your battery will run before discharging, give this battery life calculator a try.

www.omnicalculator.com

Say, device with tiniest MCU (needed just 2 mA current for work) powered by CR2032 battery (of 200 mAh capacity) and sleeping almost 5 mins...

 

The new esp32 SDK is got of very huge size and the downloading (and + unpacking + installation) is failed due to the timeout is out.
Add\edit the "connection_timeout" parameter in the settings...

 

 

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 2000
#End Region
'Ctrl+Click to open the C code folder...

 

Received it today (24vdc input) and using it to control banks of short and medium wave infrared lights to dry print on flexo graphic printing machines using water based inks (previously solvent...

 

Lessons i have prepared for beginners in Arduino and B4R.

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Fundamentals of Microcontroller Device Research for Beginner Arduino Developers​

Introduction​

...

 

Hello!

Last December I made a request for support for the ESP32 Camera support. Well, I finally found the time to work on it myself and here's my initial attempt at implementing this with...

 

Today I was impressed. While being at the university, some 20 years ago I 've had a hard time understanding the principles of Transistors and MOSFETs. That was partly because I was starting...

 

An inline C wrap for this Github project. Should be able to use it for PID control. It works very well.

Study the code - change your pins to what you need. For the attached project:
A0 =...

 

Attached is a B4R project (using inline C) to manipulate the ports of the Controllino Mega. In this project we do the following:
1. Toggle the OVL (over voltage) LED of the PLC between on/off...

 

Today I learned a new thing. Besides I2C there is also I3C which has different key features than I2C but can operate at a legacy mode also. I am under the impression that it is a fairly new thing...

 

As the title says, a standard WiFi-QRCode ist displayed on a tft screen. This can be scanned by any modern phone to automatically and it connects to the ESP, so you don't need to type any...

 

Update:

1. Init Display as a separate sub
2. TFT_ESPI as "global"
3. Drawtext as a sub with parms
4. Updated example


Although there is a library and I appreciate the good work, I like to...

 

For those who enjoy making their own 8 Relays, DS18b20, Buzzer, Display, LDR Sensor,

 

Hey guys, how are you?
I want to share my second project with you
Fan control with timer
I just got the same control back via Alexa and it couldn't work so that you have the best interest. I'm...

 

Sub Process_Globals
    Public Serial1 As Serial
    Private Wire As WireMaster
    Dim bc As ByteConverter
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")...