RFID Debounce Algorithm Design

Challenge

RFID readers in high-speed scenarios will read the same tag multiple times consecutively, causing duplicate counts.

Solution

Use a timestamp-based debounce algorithm:

private Dictionary<string, DateTime> lastReadTime = new();
private const int DEBOUNCE_SECONDS = 5;

public bool ShouldRecord(string tagId) {
    if (!lastReadTime.ContainsKey(tagId)) {
        lastReadTime[tagId] = DateTime.Now;
        return true;
    }
    
    var elapsed = (DateTime.Now - lastReadTime[tagId]).TotalSeconds;
    if (elapsed >= DEBOUNCE_SECONDS) {
        lastReadTime[tagId] = DateTime.Now;
        return true;
    }
    
    return false;
}