B4R Tutorials

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...

 

With big help from Erel here are two examples of connecting two boards by the I2C/TWI (A4 and A5 pins), using the rWire library.
Inertial Measurements (mpu6050) :

' MPU 6050 board - Inertial...

 

Edit: see post #5 for an updated version.

This application is controlling a stepper motor which can be turned by a wanted angle and speed. I use this motor...

 

Memory is a big issue in Arduino.

1. The available RAM is very small compared to other platforms. For example the Uno has 2k of RAM.
2. There is no sophisticated heap management which means that...

 

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...

 

Hello all, I read a few posts asking about the power supply requirements of the Bluetooth module. I thought I can put this hint so people can use the right voltage or power supply.
The HC-x comes...

 

This experiment moves a Little Crane arm (used some Lego parts) up and down via browser connected to a B4J websocket server.
When the arm moves, the Red LED is turned on else the Green LED is on...

 

Hello all
This is the same as Erel's "Button Example" modified by Klaus. All what I did is replacing the mechanical switch with a touch switch module. So simple that the images speak for...

 

Hi Guys

EREL is a very busy guy, and sometimes he prefers to give us some freedom on some emplacements for our Posts.

Since the advent of B4R many tutorials have been posted portraying the usage...

 

Hi,

an experiment to move a Little Crane arm (used some Lego parts) up and down via IR Remote Control (Key1=UP,Key2=DOWN). When the arm moves, the Red LED lights else the Green LED is...

 

Hi,

a Mini Weather Station experiment displaying on a 16x2 LCD the Temperature + Humidity (Line1) and Pressure + Altitude (Line2).
In addition, a trendindicator (=,+,-) is shown for each...

 

Hi,

a simple analog read example which reads the temperature from sensor TMP36 and logs the result.

Sub Process_Globals
    Public Serial1 As Serial
    Private TempSensorPin As Pin...

 

B4x Object Browser will soon support B4R and is free.

https://www.b4x.com/android/forum/t...r-api-documentation-b4x-object-browser.25682/

 

Hi,

please find a B4R & B4J HowTo Project: DHT11 Sensor Data send via RF24 Client to RF24 Gateway which routes to a Webserver displaying the Data in Google Chart

B4R RF24 Client

• ...

 

Hi,

as an example build a B4R & B4J solution to display DHT11 sensor data (Temperature & Humidity) in a google line chart created and refreshed by a B4J webserver.

Update 2016.05.24
There...

 

An example of a DHT11 sensor connected to an Arduino interacting with B4J server application.

• A B4R program gathers every 10s sensor data and sends the data in JSON format via UDP to a B4J...

 

An example of connecting an ESP8266 (NodeMCU used for this experiment) and an Arduino MEGA.
The Arduino runs B4R and the ESP8266 runs ESP8266 Basic.
Note 1: Using ESP8266 Basic is for the...

 

RGB Leds are equivalent to three leds (red, green and blue) combined. This allows mixing the three colors which results in many different colors.

There are two types of RGB leds: common cathode...

 

This example is based on the connection diagram described here: https://www.b4x.com/android/forum/threads/rgb-leds.65998/

In this case we will control the led color with a B4J program.

The...

 

Hi,

based on previous Analog Read Example, Analog Read Example using Ethernet, Analog Read Example using MQTT extended the solution by displaying the temperature (in C and F)...