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: SD.h, Stepper.h, Servo.h, SoftwareSerial.h, Wire.h, SPI.h, and EEPROM.h (all for the Arduino V1.6.6 release). 

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, an SD card with  SPI interface, digital and analog waveform generators, piezo speakers, LED's. push-buttons, resistive pull-ups and pulldowns, and a slider potentiometer. All devices are electrically (and mechanically)  modelled.

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).  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

  • V2.4.1 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
  • UnoArduSim V2.4 Released! Finally, I have managed to get the new version produced, with the usual minor bug fixes, plus some nice new features, all fully described in the new Help files:a ...
    Posted Jun 3, 2019, 10:32 AM by Prof Simmons
  • UnoArduSimV2.3 Released The new version contains a good number of bug fixes, and several new I/O devices ( including new support for the 1-Wire library) :1) A 7-Segment LED digit ...
    Posted Dec 30, 2018, 3:16 PM by Prof Simmons
  • UnoArduSimV2.2 Released Version 2.2 is now posted. Along with a few minor bug fixes, three important additions have been made:0) Highly accurate representation of the effect of interrupts on code ...
    Posted Jun 16, 2018, 7:29 AM by Prof Simmons
  • UnoArduSimV2.1 Release A new version V2.1 has been released. It fixes some minor bugs, and changes the Variables Pane update policy (and VarRefresh menu) to prevent excessive update loads when very ...
    Posted Mar 12, 2018, 8:45 AM by Prof Simmons
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