B4R Tutorials

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

Wiring diagram:

Result...

 

Hello all, I read a few posts asking about the power supply requirements of the Bluetooth module. I thought I can put this hint so people can use the right voltage or power supply.
The HC-x comes...

 

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...

 

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...

 

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...

 

An example of a DHT11 sensor connected to an Arduino interacting with B4J server application.

• A B4R program gathers every 10s sensor data and sends the data in JSON format via UDP to a B4J...

 

I use inline C in my B4R projects quite a bit in my projects. Mostly I have some C/C++ code I want to call from B4R subs - that's well documented on the forum (the Inline C intro here)...

 

I've hacked my already hacky B4AHelp program to give tidier results when looking at B4R Xml files.

EDIT: Updated to v1.1 to overcome a change in the Xml format that I just noticed.

 

B4R & B4J experiment to monitor the state of a Reed switch connected to an ESP8266 - a NodeMCU is used. If the Reed switch state changes (triggered by a magnetic contact), data is send to a B4J...

 

Hi,

please find a B4R & B4J HowTo Project: DHT11 Sensor Data send via RF24 Client to RF24 Gateway which routes to a Webserver displaying the Data in Google Chart

B4R RF24 Client

• ...

 

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...

 

Today I was impressed. While being at the university, some 20 years ago I 've had a hard time understanding the principles of Transistors and MOSFETs. That was partly because I was starting...

 

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...

 

This example is based on the connection diagram described here: https://www.b4x.com/android/forum/threads/rgb-leds.65998/

In this case we will control the led color with a B4J program.

The...

 

Hello;
I needed date time functions; And some write codes.
it is first sharing with B4R

use this variables for date &time
Public Time_HH As Int
Public Time_MM As Int
...

 

 

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...

 

Sub Process_Globals
    Public Serial1 As Serial
    Private Wire As WireMaster
    Dim bc As ByteConverter
End Sub

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

 

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 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...