B4R Tutorials

B4R v1.20 added support for ESP8266 modules. ESP8266 is a great module for IoT solutions. For a few dollars you get a powerful microcontroller with built-in support for wifi.

I recommend to...

 

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...

 

Edit: A simpler and more powerful tool is available: https://www.b4x.com/android/forum/threads/esp-configurator-based-on-b4rserializator.81452/

The attached project allows the user to...

 

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...

 

In this example we will connect an Android...

 

v4.00 - September 5, 2023: https://www.b4x.com/android/forum/threads/b4r-v4-00-is-available-for-download.150115/

• This update adds support for the latest version of Arduino IDE...

 

So you are interested in using an Arduino Pro Mini or compatible board instead of one of the other larger boards to interact with your hardware devices. The Pro Mini does have some advantages over...

 

This is a small B4J program that uses jSerial library to connect to an Arduino board.

To see it working start with this...

 

B4R strings are different than in other B4X tools. The reasons for these differences are:
1. Very limited memory.
2. Lack of Unicode encoders.

A String object in B4R is the same as C char*...

 

Sub Process_Globals
   Public Serial1 As Serial
   Private btn As Pin
   Private led As Pin
End Sub

Private Sub...

 

Arduino C example #1:

void setup() {
  pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the...

 

The GSM shield allows the Arduino to connect to cellular networks. This opens the door for many interesting outdoor...

 

A simple example that uses a Timer to change the state of pin 13 (this is the pin connected to the built-in led):

Sub Process_Globals
   Public Serial1 As Serial
   Private Timer1 As Timer...

 

Here is a short tutorial on how to control an 8 channel relay module via MQTT. Below you will find both the WeMos and Android source codes needed to get started. The relay module is connected to a...

 

This tool replaces the browser based solution...

 

Hi,

this is an example of using the Real Time Clock DS1302 (from sunfounder).
There are two versions:
1. Manual: Set the time manual befor uploading. After uploading the time is...

 

This B4R example/library works with DHT11 and DHT22 temperature and humidity sensors:

This inexpensive device (DHT11) allows for measure temperature and humidity:

• Very Low cost
• 3...

 

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...

 

In the previous example we broadcasted a single byte as part of the advertising data: https://www.b4x.com/android/forum/threads/ble-hm-10-module-broadcasting-a-single-byte.65785/

In this...

 

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