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Chapter 10. Light Sensor with LED Control > Transmissive Light Sensor

10.3. Transmissive Light Sensor

Another way to detect an object is for it to block the light. This is called a Transmissive Light Sensor. Figure 10-9 shows a gate where an object can roll between the LED and the LDR. Without an object in the gate, the light level will be 100, but it will drop to about 40 when the light is obstructed.

Figure 10-9. Transmissive light application



  

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