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INDEX |
MY EXPERIENCE IN AUTONOMOUS ROBOTICS | |
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Temperature
Sensor-LM35 Light Sensors-LDR LDR continued Photo Diode Photo Transistor TSOP1738 Distance Measurement Color Sensing Angle Measurement Sensor Links
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Photo Diode Photo diode works in reverse biase region. A photo diode leads can be identified by seeing the length of the leads. Short lead is the cathode connected to greater voltage. The current flowing through the photo diode changes with intensity of the light. You can use it for edge detection. I tried to do edge detection of a table, i got range about 7cm. IR LED is used for producing light. When you are using IR LED be sure that it is working properly by measuring the voltage across the IR LED, should be greater than 2V. When connecting IRLED the voltage of the circuit drops, so be careful that voltage to other circuits won't fall below the level.
Photo diode and IR led looks same. The
only difference is in its color IR LED is some dark
in color. If you still can't identify. See this post
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