Re: Arduino Virtual Breadboard Crack
Sacha Weakland
In addition to in-circuit virtualization with Avatars VBB also has limited support for fully virtual circuits when getting started. The virtual ATmega328p component is an instruction-set simulator with support for DIP and Arduino UNO footprints. HEX files output from the Arduino IDE can be loaded and simulated in VBB by dragging and dropping the HEX file onto Arduino UNO.
The Arduino IDE examples don't allow you to make changes to the Sketch or generate HEX files into the examples Sketch folders so you will need to save the Blink Sketch into your personal Sketch folder or other location.
The Arduino IDE is a simplified build system for the gcc compiler. If you are very new to Arduino you might not be familiar with the idea that the output of the Arduino IDE is a HEX file. The HEX file itself is just a hexadecimal encoded version of the raw binary instruction set program that the microcontroller will actually run.
With a real arduino the HEX is transparently sent over a serial port to the microcontroller to self program so normally you don't see the HEX file. In VBB though we pass the HEX directly to the virtual microcontroller as a File and then VBB decodes the file and executes the binary so we need access the HEX file itself.
VBB only virtualises the ATMega328p microcontroller so you need to make sure the correct board is setup in the Arduino IDE to generate the correct HEX. You should choose the Arduino/Genuino Uno board
The ATMega328p co-processor is the same microcontroller as used by the standard Arduino UNO. By default it is configured to execute HEX files so it's easy to create a project from scratch to run simulations of your Arduino code.
The Virtual ATmega328p needs to have a program to run. When a real Arduino is programmed it stores the binary program to Flash. The virtual ATmega328p stores the last programmed firmware in the HEX property as part of the project and so in this way acts like the real ATmega328p.
To update the embedded program you drag and drop the HEX file from your Arduino project folder onto the Virtual Arduino. You can also drag and drop during runtime without having to restart the simulation.
Designing and documenting breadboard circuits using software prototyping tools (e.g., Fritzing, VBB, and 123D Circuits) has become a common practice in the maker community and beyond, with these tools being heavily used by those without a strong electronics background. However, much of the existing software requires the circuit components to be manually added and connected by user, which can be error prone and time-consuming. Common hardware errors, such as missing components (e.g., not using a resistor with a LED) or miswiring, also occurs in the virtual world, and can lead to significant time and efforts from the users to debug.
To demonstrate the effectiveness of autocomplete, we implemented our system on Fritzing, a popular open source breadboard circuit prototyping software, used by novice makers. Our autocomplete suggestions were implemented based upon schematics from datasheets for standard components, as well as how components are used together from over 4000 circuit projects from the Fritzing community.
We report the results of a controlled study with 16 participants, evaluating the effectiveness of autocomplete in the creation of virtual breadboard circuits, and conclude by sharing insights and directions for future research.
Software-based tools for circuit prototyping (e.g., Tinkercad Circuits) are increasingly used by novice makers in projects that involve electronics. Typically, these tools include a virtual breadboard to help a user construct and test a circuit. However, circuits designed and created on a virtual breadboard cannot be interacted with physically. This becomes an issue when prototyping interactive artifacts that involve input or output (I/O) components (e.g. sensors and motors), as a user typically needs to interact with the components physically, in a real environment.
Figure. (a) A user designs a circuit on software and links the photoresistor as a physical proxy, where an instruction window will pop up. (b) The user can test the circuit by physically interacting with the component (c) The user can remotely collaborate with others for help. The circuit in the both sides are connected and working together (d) Finally, the circuit can be directly deployed with a WiFi module.
Launched in 2005, the Arduino open hardware and software platform has grown to be very popular among hobbyists, educators, and professionals alike, gaining momentum especially in the robotics field. Backed by a massive online community, and with most development boards and hardware accessories available at very low prices, this platform is perhaps the best place to start in working with embedded devices. But what if you want to learn programming and do not own an Arduino board, or are overwhelmed by the selection of hardware out there? This is where simulation software comes in.
These products generally create a virtual environment in which not only can you write code but you can also create electronic circuits to test the behavior of your code. In the selection of software presented below you will notice that very different sets of features are offered by each application. Some offer vast libraries of hardware to select from, while others allow you to develop in visual environments and show results in graphical form, while others plot graphs and display data sets.
Some even accurately render your project in 3D and allow data export for professional fabrication of electronic circuits or elements. You will also find MCU emulators, as we will discus later in the article, that execute program instructions in the exact same way real hardware would. Some of these products are completely free and open source, while others cost several times more than hardware.
Speaking of cost, why would you bother with such software when boards and accessories come so cheap? Well, there are a number of features and advantages that simulation software offers, compared to a standard IDE and hardware combos. For instance debugging features are very extensive in some simulators, and you can also observe and correct functional errors of your programming, while IDE software debuggers address only non-functional or technical mistakes in code, such as improper declarations, invalid objects or syntax errors. In visual simulation environment you can actually see what your program does, so you can alter it on-the-fly if necessary, or build new functionality in a very creative way. You can also log and plot output data, to check how hardware responds in a given situation.
Created by Australian company Virtronics, Simulator for Arduino is a pretty powerful software for PCs running Windows. It supports most Arduino hardware, such as Uno, Mega, Nano and other common boards. It comes with a range of features that aid rapid sketch prototyping and debugging as well.
123D Circuits is an online electronics simulator and collaborative design platform, born from the partnership between Autodesk and Circuits.io, since in Fall 2013. It is an excellent tool for beginners who want to quickly get a grip of creating with Arduino, Raspberry Pi or other platforms right from their browser window.
Virtual circuits can be created by using the intuitive breadboard editor, or the more advanced electronic schematics or PCB editors, and ready made components and designs are also available for you to implement. Programming of the newly created circuits is possible with the code editor and operation is displayed in real time. You can also fabricate and order the electronics based on your own design.
Virtual Breadboard is perhaps the most advanced Arduino simulator available. It was created by James Caska back in 1999 and nowadays it has evolved into a very mature software with a long list of features. Not only does it simulate Arduino devices but also Netduino and PIC microcontrollers. It features a visual development environment and it also allows you to program a real Arduino boards.
It is compatible with Fritzing and J.A.R.V.I.S and also doubles as a powerful AVR emulator. The core software, for Windows, is free to download, however functionality expansion modules are licensed individually.
Apart from its obvious Arduino sketch debugging abilities, ArduinoDebugger is also a simulator. The software is created by Paul Richards (Paulware) and supports a number of components such as segment and LCD displays, 4051 MUX, LED functions, to mention some of them. The open source software is written in C++ and runs under Windows.
This software is an Arduino customized version of the well known CodeBlocks IDE, with a recently added API based Arduino simulation feature, which is however in a very early development stage. Stay tuned for updates on this matter.
Simuino is an Arduino Uno and Mega pin simulator for Linux (Ubuntu). It runs in a terminal and displays pin results based on your sketches. It also had a web based version, the Webuino, but unfortunately it has been offline since last year. Files available on Google Code.
Well, what is the difference between a simulator and an emulator, and when to use one or another? Emulators generally execute code instructions in exactly the same way an embedded device would do it, down to hardware level.
For instance if we look at an ATMega328 MCU, specific to the Arduino Uno board, we see specs like RISC 8-bit CPU, 20 MHz frequency, up to 4 instructions per cycle, and so on. These are completely different from specifications of the desktop-class CPUs which power your PC or Mac, which are generally x86 64-bit multiple core and thread processing units, running at over 2 GHz frequencies.
Not only will execution timing the program be completely off when testing in simulation software, but data throughput and resource handling will also be completely different, leading to discrepancies in expected and actual behavior your code. MCU emulators address this basically by creating an environment where the exact amount of resources as in real life is made available, by means of a virtualization mechanism (i.e. virtual machine). This comes in handy when debugging at levels more closer to hardware is required, like observing how resources are allocated and freed up during program runtime, possible errors or limitations for certain code.
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