B4R Tutorials

I need to create a large string for http call. Using joinStrings if string variable is more than ~ 100 characters it crashes. I saw that an alternative is to use astream but how am i going to...

 

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...

 

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...

 

Some boards like Arduino Mega and Arduino Due have several hardware serial ports. These ports are very useful if you need to interact with multiple modules. The alternative for multiple hardware...

 

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

Private Sub...

 

Here I share some examples of how to use the thermometer and the Hall effect sensor in an ESP32. I hope and it will be useful

 

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...

 

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...

 

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...

 

This is a quick tutorial on what an incremental rotary encoder (or rotary encoder for short) is and what it can be used for.

A rotary encoder is an electromechanical device that generates an...

 

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...

 

Excuse my English, it's not my native language
I am not an arduino expert, I want to contribute with this code.

one of the main problems is to save information, one of this is in the EEPROM...

 

This may be of interest to someone. I am using a Wemos D1 R2 in AP mode to serve a webpage to a client. The Wemos creates a server called "Wemos_Server" using the IP 192.168.4.1.

When the browser...

 

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...

 

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...

 

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...

 

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

 

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...

 

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...

 

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...