Keyestudio KS4028 Manual page 272

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Note：
1. The maximum distance is 4 meters during testing.
2. In the test, open the white lens to check rectangular sensing part. When
the long line of the sensing part is parallel to the ground, the distance is
the best.
3. In the test, covering the sensor with white lens can sense the distance
precisely.
4. The distance is best at 25℃, and the detection distance value will reduce
when temperature exceeds 30℃.
5. After powering up and uploading the code, you can start testing after
5-10 seconds, otherwise the sensor is not sensitive.
(3)Test Code:
272