B4R Tutorials

RGB Leds are equivalent to three leds (red, green and blue) combined. This allows mixing the three colors which results in many different colors.

There are two types of RGB leds: common cathode...

 

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...

 

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...

 

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...

 

I am working on a little thermometer project for my greenhouse using an ESP8266 and a temperature sensor. You have multiple sensors to choose from such as DHT11/22, BMP180 etc, but no...

 

Cracked it - can connect the DS3231 to any 2 digital pins of my Nano and read the date, time, and temperature by making use of the B4A core library only. All control of the SDA (data) and SCL...

 

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 600
#End Region
'Ctrl+Click to open the C code folder...

 

The attached project is based on these postings:
https://gist.github.com/bloc97/b55f684d17edd8f50df8e918cbc00f94...

 

Understanding why you might need a pull up resistor...

Not exactly a tutorial from directly within this forum, but nevertheless I'm more than sure that this will help a few new B4R users...

 

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...

 

As the title says, a standard WiFi-QRCode ist displayed on a tft screen. This can be scanned by any modern phone to automatically and it connects to the ESP, so you don't need to type any...

 

Programming an ESP-12x module directly is not too difficult. If you purchase an ESP8266 with a built-in USB port like a WeMos D1 Mini or a NodeMCU etc, then you do not need to do this as the...

 

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...

 

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
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...

 

Hey guys, how are you?
I want to share my second project with you
Fan control with timer
I just got the same control back via Alexa and it couldn't work so that you have the best interest. I'm...

 

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...

 

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

 

MQTT is an excellent solution for connection of multiple devices.

Tutorial about MQTT: [IoT] MQTT Protocol

The rMQTT library, which is based on PubSubClient open source project, makes...