B4R Tutorials

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...

 

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...

 

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...

 

Here is an interesting article for MQTT Broker scalability:

Top 10 IoT Scalability Tests for an MQTT Broker

Describing some key criteria when evaluating MQTT brokers to ensure the successful deployment/operation of an MQTT system.

www.hivemq.com

 

Hi All,

The attached zip files have the Arduino libraries and the B4R libraries together with a small B4R app showing how to use the Adafruit MPR121 capacitive touch 12 key keypad.

Big thanks to...

 

This is not really a tutorial, just a small piece of information regarding the microstepping.

With respect to the library from Erel...

 

So you are interested in using an Arduino Pro Mini or compatible board instead of one of the other larger boards to interact with your hardware devices. The Pro Mini does have some advantages over...

 

Here is some code to demonstrate using a single stepper motor, an Uno, the Adafruit Motor Shield and a three-way switch. The middle position of the switch is OFF. One side rotates the motor until...

 

arduino-cli interface for the new B4R version can be adjusted by a configuration file, where i could setup at least the EN language - create the file "C:\Program Files\Arduino...

 

Hello all
This is the same as Erel's "Button Example" modified by Klaus. All what I did is replacing the mechanical switch with a touch switch module. So simple that the images speak for...

 

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

 

Here's an advanced ESP32 Now example. The Inlince C code is from several sources (see the inline remarks).

Note: Sometimes there are issues with the Wifi channel (WiFi and ESP Now must use the...

 

I didn't really know what SPIFFS stood for. I knew the basics of what it was but still I should have known more about it, so here is some information about SPIFFS.

Please note: I didn't...

 

The code was taken from this site: https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/

You need 2 ESP32's (one is the sender, the other one the receiver). Modify the code to have...

 

Not really a tutorial as I'm no good at writing tutorials, but important to know nevertheless.

WARNING: Relays can be used to switch very high voltages. Here in the UK 240VAC can easily...

 

Here is a really simple tutorial with source code on how to send data through a computer com port or laptop USB to Serial com port to receive data on your Arduino based microcontroller board. I...

 

Hi everyone,

Last night I found this guy who explains everything simply and very detailed. Here he explains how to load our Arduino sketch directly (or indirectly) in an ATMega328P-PU...

 

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...

 

Hi everyone,

Watching tutorials on YouTube I came across this application which allows you to check blue tooth communications. I suppose it will be handy to all of you...

 

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...