B4R Tutorials

The EEPROM is in most cases the only persistent storage available. As a persistent storage we can use it to store data that will not be lost when the board is turned off.

The rEEPROM library...

 

This guide is obsolete ! It is no more updated.
Please use the B4X Booklets.

Here you find the B4R Beginner's Guide in pdf format.

The source code for the example programs is...

 

Hi guys...

The equipment's I install all get the "current clock" from the server on first connection...
I wonder if this is possible to implement with such boards... like requesting the correct...

 

rEthernet library v1.10 (included in v1.00 beta 9) includes a new type named EthernetUDP. It allows sending and receiving UDP packets.

UDP is simple to work with as it is a connection-less...

 

Example of implementing a "traffic light" with 3 leds. There are four states: red, red + yellow, green and yellow.

It uses CallSubPlus to switch to the next state after the current state...

 

Hi,

whilst exploring B4R (as a hobbyist), build experiments in several categories. The experiments also show B4X integration examples.
A few experiments to mention:

Change Log...

 

Libraries are written in C++.
Libraries are made of a single h file and one or more cpp files. Libraries can also include other h files which will not be exposed.

All the files should be in the...

 

Testing the HC-SR04 to measuring distances

Spoiler: Physics Info

The accuraccy of the sensor depends greatly on...

 

1 - INTRODUCTION

Hi Guys,

My wife's eldest son is addicted to PS4 F1 2020 game, even bought himself a Rig for a Steering Wheel and Pedals.
He works alongside with me and on one of...

 

Inspired by this example: https://dzone.com/articles/iot-push-notifications-arduino I've created a similar solution in B4X.


When the button is clicked, two http requests...

 

So long that I haven't played with B4R ! Today I want to test a vibration sensor (it's on a closed case yet)
The sensor signals when a sensor shake happens. It's a simple sensor (detected/not...

 

Hello,

Since a while i searched to do the same thing i did on an ESP01, but with B4R.
I did it 1st time in Arduino IDE , see the video at bottom, that works well

I searched long time to...

 

Relays are electronic switches that allow low power (voltage) devices to control high power circuits.

In this example the ESP8266 board controls a regular 220v light bulb.

*** High power...

 

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...

 

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...

 

Arduino Uno with LCD shield:

Working with a LCD monitor:
1. Initialize the LiquidCrystal object and set the connected...

 

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...

 

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...

 

This example (adapted from the Arduino examples under Arduino->File->Examples)

- downloads a file from a server (exactly: the update file)
- store this file to the filesystem (SPIFFS)
- starts an...

 

So you have an ESP-12F and want to use it in a project, well I find that the best way for my home projects is to use an 12x adaptor plate. I have a number of ESP-12F projects running throughout my...