B4R Tutorials

B4R v1.20 added support for ESP8266 modules. ESP8266 is a great module for IoT solutions. For a few dollars you get a powerful microcontroller with built-in support for wifi.

I recommend to...

 

This example generates a OTP/2FA ("One Time Password") as you know it when you login to a website and you get a 6 digit code via sms. It changes every 30 seconds.

How it works:

- as it is time...

 

Here is a nice tutorial by the guy in DronebotWorkshop. What surprised me (and I did not know that) is that with e-paper you only have power consumption while writing to it and no more. Even if...

 

Here's an updated example how to

- generate an RSA keypair (Public and Private key) on a ESP32 and on B4x
- export these keys in PEM format (compatible with any other plattform like B4x, .net...

 

 

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...

 

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...

 

I've been working with SSD1306 OLED for long time, in some projects I was in need to add some special fonts and add some graphics or icons like blue tooth symbols. I thought to put all these...

 

Good morning everyone,

I have put together this Excel file which shows the "translations" bettween AWG value of cable (american wire gauge) and european metric value of surface and diameter. I...

 

Taken from here: https://randomnerdtutorials.com/esp-mesh-esp32-esp8266-painlessmesh/

The example uses the "painlessmesh" library. Just add it via arduino's library manager. Other libs will...

 

Temporary solution:
After you start compiling and compiling log reachs uploading sketch stage, you should continuously press BOOT button on ESP32 board until uploading complete...

 

Hey everyone,

here is an implementation of a car lights checker which reports if all 4 car's lights are working properly. To find out if there is a problem with the lights (head and rear) we use...

 

Here is a tone function that does Arduino's tone()
The buzzer is connected between pin 6 and ground :

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    Delay( 1000)...

 

Hi guys,

So B4R is so much more than simply code and breakout boards assembled/connecter by jump-wires and breadboards...
I know for a fact that most of us are not electronics pronned and thus...

 

 

This example downloads a file from a server folder (here I use a folder in htdocs on my apache server) and saves it to a file on the file system. Tested with 700KB files. Set headers (browse the...

 

This is an updated example how to en-/decrypt data with AES256.

Libs needed: jRandomAccessFile only

Notes:

- As far as I know, the ESP32 doesn't support padding like PKCS5/7, so I had to do it...

 

Ola

Code Module - B4r - Queue List [module]
Code Module - B4r - Stack Collection [module]
Code Module - Http - Rhttputils2 - Http Client [module]
Library - Arduino - Radafruit_mcp3008...

 

My office gets cold overnight in winter. I have a heater which has a basic thermostat but its very inaccurate (its just a min/max dial not temperature based). If I leave it on...

 

https://blinky-nina-w102.blogspot.com/2021/04/u-blox-nina-w106-sendo-programado-em_21.html