B4R Tutorials

The attached project implements the I2C communication protocol to set the Date and Time of a DS3231 RTC module. The protocol is hard coded (i.e no library) and you can therefore use any 2 digital...

 

Thanks to Erel for this great product !! (again)

Here's a PIR example (presence detection) with Arduino and B4R; the PIR sensor is the PIR HC-SR501...

 

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...

 

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...

 

This is my humble effort to produce a weather station (based on this project). You will need:

1 x Wemos D1 Mini
1 x BME280 Sensor
1 x TP4056 Li-Ion Charging board
1 x 3.7V Li-Ion Battery
1...

 

rRandomAccessFile v1.80 adds support for AsyncStreams in prefix mode.
All B4X development tools use AsyncStreams for network communication and now all of them support prefix mode...

 

The attached project is based on this posting:

How To Track Orientation with Arduino and ADXL345 Accelerometer

In this tutorial we will learn how to measure angle and track orientation using the Arduino and the ADXL345 Accelerometer sensor. The ADXL345 is a 3-axis...

howtomechatronics.com

Have downloaded and installed...

 

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,

LCD Char Maker Tool.

Functionality

• Create custom LCD character with 5 pixel horizontal (cols), 8 pixel vertical (rows).
  Each row is represented by a byte with 5...

 

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...

 

I saw a post or two about how to get the local date & time with no easy answers. I need this myself for my first Arduino project so I had a look around and found a free API that does just this...

 

Hello;
this code module is for using HX711 load cell amplifier board with Arduino, I used it with UNO and MEGA without any problems, only 4 pins are required for voltage supply and communication...

 

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...

 

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...

 

Just for the fun of it. Can now control my Digital Satellite TV decoder from anywhere in my house....
Nano connected to the HC-05 module
B4A app connects to the HC-05 and sends the B4A "button...

 

Merry Christmass everyone in the Christian community of this forum,

Yesterday I 've had a great crazy idea which turned out to be a working one too.

Normally one would answer to the question if...

 

Hi,

based on previous Analog Read Example extended the solution by using the Arduino Ethernet Shield to send temperature data to B4J server and receive confirmation.
Full project (with...

 

Hi
Here a sample program to control 8 outputs on arduino ESP32. The program use the MQTT protocol to exchange the data (really a single byte). By Node-red web interface the user set or reset 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)...

 

This is about how to exchange AES256 encrypted messages incl. generated IV (initialization vector) between a ESP32 and B4x.

Notes:

- the ESP uses AES/CBC/NoPadding. The data must be padded (must...