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The sensor can detect white caps but not black ones.: 白色瓶蓋能檢測(cè)到，但是黑色瓶蓋檢測(cè)不到。

Well, did you set up the sensor adjusted to the reflection rate of the white cap? If so, I think that's the reason why the sensor is not responding. The reflection rate of a black object is lower than a white one. So if you set the sensor to the same reflection rate of the black cap, the sensor will be able to detect both black and white caps!: 唔～，你是不是根據(jù)白色瓶蓋的反射率設(shè)定了傳感器？如果是那樣，我想那就是傳感器沒反應(yīng)的原因。黑色物體的反射率低于白色物體。所以只要根據(jù)黑色瓶蓋的反射率設(shè)定傳感器，就能同時(shí)檢測(cè)到黑色和白色了！