B4R Tutorials

This example shows how to send http requests with a GSM shield. I've tested it on a shield with SIM900 module. This can be very interesting for outdoor IoT solutions where there is no local...

 

Arduino Uno with LCD shield:

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

 

The rSD library allows reading and writing to SD cards. The Ethernet shield as well as other shields include a SD slot.

The steps required to work with files:
1. Initialize a SD object. You need...

 

In this example the Arduino board acts as a server. Clients can list the available files and can download files stored on the SD card, which is part of the Ethernet shield...

 

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 tutorial on how to connect an actual building\house alarm PIR sensor to an Arduino and how to interpret 5 alert states (the resistance results). The advantages of using the PIR sensor in...

 

In this example one of the boards acts as an access point and a server and the other board connects to the server wifi network and to the server socket.

Note that for the client to be able to...

 

Testing the HC-SR04 to measuring distances

Spoiler: Physics Info

The accuraccy of the sensor depends greatly on...

 

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...

 

I'm new in b4r but thanks to the help of the forum i made some progress.
So i decided to share my project with all, especialy the newbies like me.
My project is a simple example on how to control...

 

Edit: use rHttpUtils2 instead: https://www.b4x.com/android/forum/threads/module-rhttputils2-http-client.74785/#content
As a general rule, I recommend to use Raspberry Pi with B4J to...

 

A digital clock and alarm without making use of a RTC. It uses:
Uno R3
LCD 1602 (to display the clock and the alarm)
Piezo Buzzer (to sound the preset alarm)
10K Pot (adjust the contrast of the...

 

Here is how to connect a 7 pin OLED display to an Arduino.

If you are anything like me, you previously owned a Raspberry Pi and did absolutely nothing with it. Well before I ever owned any...

 

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...

 

It is based on this tutorial. Nano programmed via B4R and visualizing the data from the MPU6050 with Processing -
See this posting for basic setup

B4R code:...

 

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...

 

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...

 

The rWire supports communication with other I2C/TWI devices.

One device acts as the master and the other devices act as...

 

The Arduino 101 is an Arduino board developed by Intel. It is mostly compatible with standard...