# Project Simulation

Before programming the FPGA, simulate your project behavior:

1. Click on the **Simulate** tab.
2. Choose **Advanced Simulation**.
3. Click **Menu → Run Iverilog**.
4. Observe the main signals:

<div align="left" dir="ltr" id="bkmrk-signal-description-a"><table border="1" class="align-center" style="border-collapse: collapse;"><colgroup><col width="159"></col><col width="273"></col></colgroup><thead><tr><td class="align-center">Signal

</td><td class="align-center">Description

</td></tr></thead><tbody><tr><td class="align-center">accelX/Y/Z

</td><td class="align-center">Sensor data values

</td></tr><tr><td class="align-center">value (CORDIC)

</td><td class="align-center">Computed tilt angle

</td></tr><tr><td class="align-center">valueOut (filter)

</td><td class="align-center">Smoothed angle output

</td></tr><tr><td class="align-center">active (closeLoop)

</td><td class="align-center">Control signal to the servo

</td></tr><tr><td class="align-center">pwm

</td><td class="align-center">Pulse generated to drive the servo

</td></tr></tbody></table>

</div>If errors occur, check the connections and retry.

![](https://lh7-rt.googleusercontent.com/docsz/AD_4nXeEA0BtDYIkz-7yJqIKmOZUnXeyCUcxhQaboh3uyaGf26m_Tg6QQCa2vW0UMV21xrmS6CgK6dzHUSgJpuOT1k1ECX-foCoysNtmd52YQUoeVAUJNxzwx9Dog3bx4D2HqxjEZke12TKi4c5yCqimA2A?key=eUXdN7xCz3McsOeNnMhha5wj)