B4R Tutorials

Based on SSD1306 module, we can implement horizontal and vertical progress bars. These bars could be drawn at X1-Y1 to X2-Y2 like drawing rectangles, also we need to pass the full scale...

 

Edit: see post #5 for an updated version.

This application is controlling a stepper motor which can be turned by a wanted angle and speed. I use this motor...

 

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...

 

B4R strings are different than in other B4X tools. The reasons for these differences are:
1. Very limited memory.
2. Lack of Unicode encoders.

A String object in B4R is the same as C char*...

 

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
...

 

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...

 

I using this code, Because Board has a problem for records size capacity of epprom.

Sample

Log("17:45:36 False >>",DateTime.TimeToUint(17,45,36,False)) '>>> 1065
    Log("1065 // 17:45:36...

 

Arduino C example #1:

void setup() {
  pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the...

 

It's a very small and quite powerful ESP32-board with WIFI/BLE and B4R support!

Use following board library in the Arduino-IDE in 'Settings'...

 

Here is a tone function that does Arduino's tone()
The buzzer is connected between pin 6 and ground :

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    Delay( 1000)...

 

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...

 

Example of implementing a "traffic light" with 3 leds. There are four states: red, red + yellow, green and yellow.

It uses CallSubPlus to switch to the next state after the current state...

 

Hi Guys

EREL is a very busy guy, and sometimes he prefers to give us some freedom on some emplacements for our Posts.

Since the advent of B4R many tutorials have been posted portraying the usage...

 

https://blinky-nina-w102.blogspot.com/2021/04/u-blox-nina-w106-sendo-programado-em_21.html

 

rEthernet library v1.10 (included in v1.00 beta 9) includes a new type named EthernetUDP. It allows sending and receiving UDP packets.

UDP is simple to work with as it is a connection-less...

 

Testing the HC-SR04 to measuring distances

Spoiler: Physics Info

The accuraccy of the sensor depends greatly on...

 

This is an updated example how to en-/decrypt data with AES256.

Libs needed: jRandomAccessFile only

Notes:

- As far as I know, the ESP32 doesn't support padding like PKCS5/7, so I had to do it...

 

Here's an updated example how to

- generate an RSA keypair (Public and Private key) on a ESP32 and on B4x
- export these keys in PEM format (compatible with any other plattform like B4x, .net...

 

The library rAdafruitGFX is used to draw on TFT screens. It has a default font and does not give a way to change the font for drawing text.
This is what I got when drawing very large characters...