At first, I struggled to achieve the high level of precision required for our timer. This was a critical component, as it directly impacted the app's ability to accurately track user input. After several failed attempts, I finally discovered the solution by using a custom dispatch source timer with threading.

The 2nd challenge I faced was also related to delay. The IoT pad's signals had noticeable delays, which would throw off the entire feedback system. After days of trial and error, I finally came up with a custom calibration flow within the app. This allowed for precise timing, ensuring the feedback system could reliably reflect real-time user input.