B4R Tutorials

Hi guys
I want to share my project on this great community (source code free no donation)
I think it may be useful to someone
in the source code I commented out the functions
it should be simple...

 

Battery Life Calculator

If you want to know how many hours your battery will run before discharging, give this battery life calculator a try.

www.omnicalculator.com

Say, device with tiniest MCU (needed just 2 mA current for work) powered by CR2032 battery (of 200 mAh capacity) and sleeping almost 5 mins...

 

An inline C wrap for this Github project. Should be able to use it for PID control. It works very well.

Study the code - change your pins to what you need. For the attached project:
A0 =...

 

Attached is a B4R project (using inline C) to manipulate the ports of the Controllino Mega. In this project we do the following:
1. Toggle the OVL (over voltage) LED of the PLC between on/off...

 

Today I learned a new thing. Besides I2C there is also I3C which has different key features than I2C but can operate at a legacy mode also. I am under the impression that it is a fairly new thing...

 

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...

 

Update:

1. Init Display as a separate sub
2. TFT_ESPI as "global"
3. Drawtext as a sub with parms
4. Updated example


Although there is a library and I appreciate the good work, I like to...

 

For those who enjoy making their own 8 Relays, DS18b20, Buzzer, Display, LDR Sensor,

 

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...

 

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,

I know I am not the most prolific B4R user, but I'm proud to have been the first to post on the "Share Your Creations" of this sub-Forum.
The mentioned sub-Forums have become more and...

 

The rWire supports communication with other I2C/TWI devices.

One device acts as the master and the other devices act as...

 

Hello!

Last December I made a request for support for the ESP32 Camera support. Well, I finally found the time to work on it myself and here's my initial attempt at implementing this with...

 

There is also an other quite useful capability of ChatGPT. It can help designing circuits by proposing components. The component it proposes is real and I have searched for it in...

 

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...

 

One popular MCU programmer made an YouTube stream with online testing and comparing the MCUs.
1. pin out high
2. make a test operation: a + b, a - b, a * b, a / b, sin(a), power(a, b), power(b...

 

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...

 

it is just 2 basic projects to do some tests with MQTT
we have no personal data in projects, full provisioning is done by a Web server interface

one basic project is with Wifi and MQTT client...

 

When i tried the initial code https://www.b4x.com/android/forum/threads/esp32-simple-ota-update-via-webserver.130576/ - i have faced tons of troubles with OTA via file system, at least, with...

 

I took Erel's BLE example and added (as on the ESP32 side) AES256 encryption. For some reasons I wasn't able to use SPIFFS and/or WiFi parallel to BLE on the ESP32 side. Maybe you find a...