B4R Tutorials

Here is a short tutorial on how to control an 8 channel relay module via MQTT. Below you will find both the WeMos and Android source codes needed to get started. The relay module is connected to a...

 

Sub Process_Globals
    Public Serial1 As Serial
    Private wifi As ESP8266WiFi
    Public mylcd As LiquidCrystal
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)...

 

It's a very small and quite powerful ESP32-board with WIFI/BLE and B4R support!

Use following board library in the Arduino-IDE in 'Settings'...

 

Example:

- AES256 encrypt a message with IV and Salt
- Base64 encode it
- send a http post request to a php script
- decrypt in php
- send back a AES256 encrypted and Base64 encoded message to...

 

This example replaces my previous examples with cleaner inline C coding (I'm getting better )using almost all variables from Globals. You can define the keysizes (eg. 2048 or 4096). It's fully...

 

Having had my work flow cut down in the middle by vicious "circumstances" I decided to let it all go and "go fishing" as mr. Miyaghi (Karate kid) would say. So I did some things I couldn't do...

 

MicroPython officially becomes part of the Arduino ecosystem | Arduino Blog

At Arduino we like to experiment with new technologies to figure out if we can use them to improve the tools we make for our users. We’ve recently been experimenting with the Python language as a possible extension for our programming platforms, considering how it has become the number one...

blog.arduino.cc

 

Hi
Here a sample program to control/monitor 8+8 digital Out-Inp, plus an I2C ADC.
The program use the MQTT protocol.
This program is an evolution of the previous one I posted.

This version add...

 

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...

 

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...

 

Tool to design LCD Display Layouts for 20x4 or 16x2 displays connected to Arduino, Raspberry Pi or other.

Screenshot application with generated B4R code and an Arduino UNO with...

 

Hey everybody,

Just found this and looks very impressive...

 

This is not a tutorial for B4R. I think a glossary of terms might be useful for beginners to electronics and B4R. So I created my own list in GitHub to record the terms that I find need...

 

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...

 

This tool replaces the browser based solution...

 

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...