B4R Tutorials

Hi everyone,

This project is a parking detector. It is not my idea and it exists already in Stavros Niarchos Foundation Parking already materialized but it has been a great pleasure analyzing it...

 

Hi everybody,

I found this application on Play Store and it is very useful for prototyping using components...

 

this is a very simple example shows how to drive 4-digits 7-segment display with MAX7219 and rLedControl library, this code example displays 'HoLA' word, you can add more digits and MAX7219...

 

Hi everyone,

Yesterday I watched a video and I would like to share the knowledge accomplished with you. Do you know Billy Brown? Well "Billy Brown Revives On Your Gin But Values Good Whiskey...

 

This is a very detailed analysis on circuit analysis comprising of two videos. They are huge videos (1,5 hours almost each) but believe me it worth it seeing them. I faced all these subjects in...

 

Do you have more good solitions; Please share it on my article.
thanks sharings.

'    ----XOR-------
'    A B Output
'    -----------
'    0 0    0
'    0 1    1
'    1 0    1
'    1 1    0...

 

This B4R project uses the SevSeg library via inline C to display characters on a 4 digit x 7 segment LED display (I am using a SMA420364L) - hard wired.

The inline C code via the...

 

This is a sample project for the IR control of the DSTV Explora Model 2A decoder (Digital Satellite TV). The hex codes comes from the B4A project that I have posted here. The B4A...

 

The attached project comes from here. Used Inline C to create and display the big/large alphanumeric characters.

I am sure you will figure out how to make use of it (i.e calling and...

 

The attached project mimics this posting. Have added the basic functionality with inline C. It uses the rCore and rLiquidCrystal libraries.

Wiring diagram:

Result...

 

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...

 

It is based on this Arduino project with the following wiring diagram:

It uses the 788BS 8x8 LED matrix (red) to display numbers/characters/other stuff (without making...

 

Here's nother example how to use RSA on a ESP32 based on this documentation:

https://tls.mbed.org/kb/how-to/encrypt-and-decrypt-with-rsa

Notes:

- If the filesystem does not work, you need...

 

This is about how to exchange AES256 encrypted messages incl. generated IV (initialization vector) between a ESP32 and B4x.

Notes:

- the ESP uses AES/CBC/NoPadding. The data must be padded (must...

 

Finally I got it working. Maybe the Inline C code is not that elegant I was too lazy to add a Salt (which I will update later). Hardest part (for me as I don't like C since the 90ies) was to...

 

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...

 

Hello All,
Here I will show, how to parse the Latitude and Longitude from raw nmea data.
I am using gps module, Arduino Uno and additional softwareSerial.

Sub Process_Globals
    Public Serial1...

 

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...