Why Use It


Arduino is a great platform, but If you're trying to debug a program with a mix of software bugs and hardware issues, you could use a free helping hand! UnoArduSim.exe allows you to do a real-time test of most Arduino programs (for Uno) without needing any actual hardware. Supported libraries are: TFT.h, SD.h, Stepper.h, Servo.h, SoftwareSerial.h, Wire.h, SPI.h, OneWire.h, and EEPROM.h (all for the Arduino V1.8.8 release)., as well as 3rd party libraries for LCD and LED displays.

UnoArduSim provides a virtual target Uno board and allows the user to choose, and interface to, one or more of several types of  virtual input/output devices. These include typical hobbyist DC gear-motor, stepper-motor,  and servo motors,  generic serial devices with selectable baud rate, generic I2C and SPI slaves, as well as I2C and SPI based LCD and LED controllers and port exapnders, an SD card and TFT display with  SPI interfacs, digital and analog waveform generators, piezo speakers, LED's. push-buttons, resistive pull-ups and pull-downs, and a slider potentiometer. All devices are acurately modelled  electrically (and mechanically).

You can load and edit (and correct) your Arduino program, then run, run-to, halt, step-into, step-over, and step-out-of  while watching all accessible  program variables and monitoring pin levels (and even pin waveforms, which can also be saved).  Simple and clear parse and execution error messages are provided. 

UnoArduSim is a free educational tool for everyone to use.

My Background


I had developed a number of simulators while working at Queen's University's Department of Electrical and Computer Engineering, and UnoArduSim.exe is my newest one.

Recent Announcements

  • V2.7.1 has a small LCD fix to V2.7.0 I needed to make a tiny fix to V2.7.0 after realizing that character-LCD displays were not showing their screen text unless the cursor had been explicitly made ...
    Posted Mar 16, 2020, 11:09 AM by Prof Simmons
  • V2.7 Released V2.7 fixes some bugs introduced by the major V2.4 re-write, some bugs from V2.6, and adds new features and  'I/O' devices, all as documented under ...
    Posted Mar 12, 2020, 8:01 AM by Prof Simmons
  • Version 2.6.0 Released (and fixed!) Update Jan 6 2020, 8:pm EST Canada:The originally posted download file UnoArduSimV2.6.0.zip contained a bug that made the new libraries that rely on the pure ...
    Posted Jan 6, 2020, 5:15 PM by Prof Simmons
  • V2.5.0 Released This version fixes some minor bugs and add support for the TFT.h library (and PImage.h) , plus a new TFT I/O device, so you can draw shapes and ...
    Posted Oct 3, 2019, 11:22 AM by Prof Simmons
  • V2.4.1 Serial Receive Bug Fix Version 2.4 had an unfortunate bug introduced which broke serial reception from SERIAL and SFTSER devices. Version 2.4.1 fixes that
    Posted Aug 26, 2019, 10:09 AM by Prof Simmons
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