You’re on the right track (ha!). This sensor outputs a voltage that effectively holds the most recent reading until the next one arrives. As you’ve seen, this type of sensor is limited by the send/return timing; if you need faster sampling you might look into infrared proximity sensors, but both types of sensors will have (different) limitations based on getting a good echo or IR reflection off of a possibly sound or light-absorbing rodent. Maybe computer vision processing is an option? However you solve it, best of luck with your project!
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