B4R Tutorials

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...

 

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...

 

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...

 

In this example we will connect an Android...

 

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

 

If you want more FLASH memory space (say 128K flash), need more RAM (how about 20K), would like your program to run a little faster, or simply want to play around with a different micro-controller...

 

There seem to be quite a few variants of the Arduino's Boards, So I thought, let's Show-Off our Boards and create a Listing, similar to the B4A devices Listing, so that when problems arises, we...

 

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

To see it working start with this...

 

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...

 

MQTT is an excellent solution for connection of multiple devices.

Tutorial about MQTT: [IoT] MQTT Protocol

The rMQTT library, which is based on PubSubClient open source project, makes...

 

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...

 

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...

 

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

 

Thanks to @Erel and the new rservo library (Beta#7), we've access to servo motors.

Servos are a motor type that allows for precise control of angular or linear position, velocity and...

 

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...

 

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...

 

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

Private Sub...

 

This example uses an Ethernet shield to connect to a server. In this case the server is implemented with B4J, though you can easily implement a similar server with B4A or B4i.

Whenever the user...

 

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...