B4R Tutorials

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...

 

Example:

- AES256 encrypt a message with IV and Salt
- Base64 encode it
- send a http post request to a php script
- decrypt in php
- send back a AES256 encrypted and Base64 encoded message to...

 

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...

 

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

 

Sub Process_Globals
    Public Serial1 As Serial
    Private wifi As ESP8266WiFi
    Public mylcd As LiquidCrystal
End Sub

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

 

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...

 

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...

 

Taken from here: https://randomnerdtutorials.com/esp-mesh-esp32-esp8266-painlessmesh/

The example uses the "painlessmesh" library. Just add it via arduino's library manager. Other libs will...

 

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...

 

Temporary solution:
After you start compiling and compiling log reachs uploading sketch stage, you should continuously press BOOT button on ESP32 board until uploading complete...

 

This tool replaces the browser based solution...

 

Ola

Code Module - B4r - Queue List [module]
Code Module - B4r - Stack Collection [module]
Code Module - Http - Rhttputils2 - Http Client [module]
Library - Arduino - Radafruit_mcp3008...

 

Hi everybody,

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

 

Excuse my English, it's not my native language
I am not an arduino expert, I want to contribute with this code.

one of the main problems is to save information, one of this is in the EEPROM...

 

Hi everybody,

looking for free PCB design software I came accross the EasyEDA. It is one of the best I have seen since you get to design multilayered PCBs and see the designed PCB in 3d view...

 

Here is a nice tutorial by the guy in DronebotWorkshop. What surprised me (and I did not know that) is that with e-paper you only have power consumption while writing to it and no more. Even if...

 

Here is a very interesting video by the guy in Dronebot Workshop. This board seems amazing. I suppose since it is Arduino compatible it can also work with B4R with the exception of the commands...

 

 

Edit: use rHttpUtils2 instead: https://www.b4x.com/android/forum/threads/module-rhttputils2-http-client.74785/#content
As a general rule, I recommend to use Raspberry Pi with B4J to...

 

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...