B4R Tutorials

Stepper motor

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...
 
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Memory, Variables and Objects

Memory is a big issue in Arduino.

1. The available RAM is very small compared to other platforms. For example the Uno has 2k of RAM.
2. There is no sophisticated heap management which means that...
 
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B4R Change Log (version history)

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[Hint] HC-05,06 Power supply

Hello all, I read a few posts asking about the power supply requirements of the Bluetooth module. I thought I can put this hint so people can use the right voltage or power supply.
The HC-x comes...
 
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B4R/B4J Experiment - Control Servo Motor connected to Arduino via Browser

This experiment moves a Little Crane arm (used some Lego parts) up and down via browser connected to a B4J websocket server.
When the arm moves, the Red LED is turned on else the Green LED is on...
 

Attachments

  • b4rhowtoservomotorbrowser.zip
    254 KB · Views: 917
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Touch switch

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...
 
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Tutorial vs Creation : Clarification

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...
 
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Servo Motor controlled via IR Remote Control

Hi,

an experiment to move a Little Crane arm (used some Lego parts) up and down via IR Remote Control (Key1=UP,Key2=DOWN). When the arm moves, the Red LED lights else the Green LED is...
 

Attachments

  • B4RHowToServoMotorCrane.zip
    245 KB · Views: 1,213
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Mini Weather Station with LCD

Hi,

a Mini Weather Station experiment displaying on a 16x2 LCD the Temperature + Humidity (Line1) and Pressure + Altitude (Line2).
In addition, a trendindicator (=,+,-) is shown for each...
 

Attachments

  • B4RHowToLiquidCrystalWeather.zip
    114.6 KB · Views: 855
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Analog Read Example

Hi,

a simple analog read example which reads the temperature from sensor TMP36 and logs the result.
B4X: 
Sub Process_Globals
    Public Serial1 As Serial
    Private TempSensorPin As Pin...
 
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B4A, B4i, B4J and B4r API documentation - B4X Object Browser

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[B4R & B4J] DHT11 Data via RF24 to display as Google Chart

Hi,

please find a B4R & B4J HowTo Project: DHT11 Sensor Data send via RF24 Client to RF24 Gateway which routes to a Webserver displaying the Data in Google Chart

B4R RF24 Client
  • ...
 

Attachments

  • B4RHowToDHT11RF24GoogleChart.zip
    98.8 KB · Views: 847
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B4R & B4J MQTT display DHT11 sensor data Google Line Chart

Hi,

as an example build a B4R & B4J solution to display DHT11 sensor data (Temperature & Humidity) in a google line chart created and refreshed by a B4J webserver.

Update 2016.05.24
There...
 

Attachments

  • B4RHowToDHT11MQTTGoogleChart.zip
    29.2 KB · Views: 994
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B4R sending DHT11 data to B4J server which displays a Google Line Chart

An example of a DHT11 sensor connected to an Arduino interacting with B4J server application.
  • A B4R program gathers every 10s sensor data and sends the data in JSON format via UDP to a B4J...
 

Attachments

  • B4RHowToDHT11UDPGoogleChart.zip
    14.3 KB · Views: 890
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Connecting ESP8266 and Arduino with rSoftwareSerial library

An example of connecting an ESP8266 (NodeMCU used for this experiment) and an Arduino MEGA.
The Arduino runs B4R and the ESP8266 runs ESP8266 Basic.
Note 1: Using ESP8266 Basic is for the...
 
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RGB Leds

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...
 
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Controlling an RGB Led from the PC

Attachments

  • B4J_ColorPicker.zip
    4 KB · Views: 930
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Analog Read Example using LCD

Attachments

  • B4RHowToTMP36LCD.zip
    1.8 KB · Views: 833
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B4R PIR (Passive Infrared Sensor) Example

Thanks to Erel for this great product !! (again)

Here's a PIR example (presence detection) with Arduino and B4R; the PIR sensor is the PIR HC-SR501...
 
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BLE (HM-10 module) - Broadcasting a single byte



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

The byte is sent as part of...
 

Attachments

  • B4A_BLE_ButtonState.zip
    7.9 KB · Views: 1,578
  • B4i_BLE_ButtonState.zip
    2.9 KB · Views: 1,078
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