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Serial Monitor not working with AVR Leonardo

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How to reproduce:

I created this minimal example with vscode/platformio and an additional LED toggle to see something in the simulation:


#include <Arduino.h>

bool ledState = false;

void setup() {

void loop() {
  ledState = !ledState;
  digitalWrite(LED_BUILTIN, ledState ? HIGH : LOW);

In SimulIDE I just create a new empty circuit and:

  1. added a Leonardo board
  2. loaded the hex file.
  3. opened serial monitor with "Open Serial Monitor."
  4. run simulation

After that I can see the LED blinking, but there is no serial output. Is there something I am doing wrong, or is this a known defect?

I tried with simulide_0.4.14-SR4.AppImage, simulide_0.4.15-SR1.AppImage and SimulIDE_0.4.15-SR1_Lin64.tar.gz.

Thanks for help




You are right, looks like there is a problem here.
I will have a look.

Thanks for reporting.

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