Bendyroad IDE reference manual. © Copyright Bendyroad 2024.

Getting started

Installing BrainBuilder Development Studio

If you haven't installed yet, go to: Installation.

Starting the Development Studio

Click on the menu entry or desktop icon for the BendyRoad IDE.

BendyRoad desktop icon

On first startup, you may find it a little too grayish, so you can choose a different skin:

Choose a skin

Exploring the built-in example

Under 'File', 'Example' is the classic "hello world" of firmware: the blinking LED.

Built in example

Connecting a development board

Laptop and development board

The example is for the Arduino Uno, but it is easily changed for other development boards. More on that later.

Go to 'Target', then 'Search programmer' to start the autoscan for a development board. Sometimes it can take a while to try a few ports before the board is found. (Only one connected board at the same time is supported)

Search development board

Generating the firmware

Go to 'Target', then 'Generate' to generate the example

Generate the firmware

The first time you use BrainBuilder, a browser window will open to link your workstation.

Once the workstation is linked, the firmware is generated. Linking is a one-time thing, so the next times you generate firmware, it will be immediate.

After a few seconds the firmware is generated, flashed, and running on the development board.

Done flashing firmware

Changing the example

Change blink freq

It's a good start to change the frequency of the 'blink', generate again, and see your change become effective quickly.

Saving the project file

It's convenient to create a folder to store your projects in. The folder is remembered for the next times you start BrainBuilder.

Starting a new project

When starting a new project from scratch, always start by adding a development board (left-click on the 'Hardware' folder). For example an Arduino Mega board.

Adding an Arduino Mega block

You can change the automatically assigned name to a name that is meaningful to you. The on-board LED is also assigned a default name that you can change. Note that in the list of variables on the left, 'led1' has been added as a variable of type 'bit'.

Arduino Mega block

Click on 'Show hints'/'Hide hints' to toggle descriptions of all the fields on this panel on or off, or click on any individual field to view only a hint about that field.

Show/hide hints

Adding more hardware


If you have a Arduino Display shield or a generic LCD Display, you can add that too in the same way.


Arduino Uno and Mega have an on-board LED that is already configured and available as 'led1'. Other LEDs you can add yourself.


With analog and digital inputs, you can define which sensors or switches are connected to which pins.

Example: For using an analog temperature sensor on analog input pin 2, use an Analog Input block, name it 'temp' and specify the port as '2'.

Analog input

By clicking on any of the field descriptions, help texts are displayed, as in this example by clicking on 'Analog port'.

This automatically adds the variable temp. The list of variables on the right-hand side of the screen is updated with the new variable.


Example: A switch connected to Digital Output port 'D12'



Rule blocks specify actions based on conditions. For example, to switch 'led2' on when 'temp' level over 23, and off if is below, add a rule like this:

if ( temp > 23 ) {
    led2 = 1;
} else {
    led2 = 0 ;
Example of a rule

Global variables

Input blocks implicitly make variables available with the name of that block. For example 'Light'. But if it is easier to work with the inverse value, we can define a Global Variable with the name 'LightInverted' and type U16. Then we can add a Rule Block to set the variable 'LightInverted' to '1024 - Light'.


If you have a LCD connected to your Arduino, add it as a hardware item:

Arduino display

Next, add a 'Screen' under 'Screen Definitions'. This will create a 'Screen Item List', to which you can add 'Screen cells'.

A screen cell is the easiest way to display a text and a value together.

For example, to show the ADC value from the temperature sensor on the display, specify text 'Temp.: ', and a value from a temperature sensor (temp).

The Arduino display has two rows of 16 characters. Numbering starts at 0. An easy way to get the lay-out correct is to use grid paper.

Screen cell

You can enter project information on the Project Info page. There's room for a description and notes.

Reordering blocks

You can drag and drop blocks to reorder them, and organize them in folders, to logically group blocks together.