B4R Tutorials

With the rSoftwareSerial library you can turn regular pins to serial ports. This is useful as the hardware serial is used...

 

In this example I'm using a BLE shield to broadcast the state of a connected button.

The byte is sent as part of...

 

Testing the HC-SR04 to measuring distances

Spoiler: Physics Info

The accuraccy of the sensor depends greatly on...

 

In this tutorial we will create a currency converter solution that shows the conversion from USD to other currencies on...

 

In the previous example we broadcasted a single byte as part of the advertising data: https://www.b4x.com/android/forum/threads/ble-hm-10-module-broadcasting-a-single-byte.65785/

In this...

 

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...

 

Hi,

based on previous examples Analog Read Example, Analog Read Example using Ethernet, Analog Read Example using MQTT and Analog Read Example using LCD extended the...

 

With big help from Erel here are two examples of connecting two boards by the I2C/TWI (A4 and A5 pins), using the rWire library.
Inertial Measurements (mpu6050) :

' MPU 6050 board - Inertial...

 

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...

 

The rSD library allows reading and writing to SD cards. The Ethernet shield as well as other shields include a SD slot.

The steps required to work with files:
1. Initialize a SD object. You need...

 

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...

 

This example is based on the connection diagram described here: https://www.b4x.com/android/forum/threads/rgb-leds.65998/

In this case we will control the led color with a B4J program.

The...

 

Thanks to @Erel and the new rservo library (Beta#7), we've access to servo motors.

Servos are a motor type that allows for precise control of angular or linear position, velocity and...

 

This B4R example/library works with DHT11 and DHT22 temperature and humidity sensors:

This inexpensive device (DHT11) allows for measure temperature and humidity:

• Very Low cost
• 3...

 

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)...

 

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...

 

In this example we will connect an Android...

 

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*...

 

The GSM shield allows the Arduino to connect to cellular networks. This opens the door for many interesting outdoor...

 

B4x Object Browser will soon support B4R and is free.

https://www.b4x.com/android/forum/t...r-api-documentation-b4x-object-browser.25682/