The resistor R1 controls the amount of current going through the LED. The Components Used In The Light Detector Circuit It flows from the positive battery terminal, through R1, the LED, and the transistor down to the negative battery terminal. High enough to turn the transistor ON.īecause the transistor is turned on, current flows through the transistor.
This makes the voltage at the base of the transistor higher. When it’s light, the LDR has low resistance. All the current will instead pass through the LDR and the potentiometer. Therefore, no current will go from the collector to the emitter of the transistor. This makes the voltage at the base of the transistor too low to turn the transistor ON. When it’s dark, the LDR has high resistance. This makes them jump into the conductive band and thereby conduct electricity.Ĭheck out Wikipedia for the physics stuff ) How The LDR Circuit Diagram Works
When light hits the device, the photons give electrons energy. They are made of high resistance semiconductor material. Scarecrow as portrayed by Ray Bolger in THE WIZARD OF OZ.Light Dependent Resistors (LDR) are also called photoresistors. (sXX) Judy Garland as Dorothy form THE WIZARD OF OZ. THE WIZARD OF OZ and all related characters and elements © & ™ Turner Entertainment Co. SCOOB! and all related characters and elements © & ™ Hanna-Barbera and Warner Bros.
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