Dusk-to-Dawn Light
In this lab, we created a light sensing system by using a BJT photocell, and the concept of voltage divider. The circuit operates as a 'dusk-to-dawn' light.
This is the circuit diagram.
After calculation, we found the expected output voltage Vb is 1.67V when R is 5kohm and Vb is 3.33V when R is 20kohm.
This is a picture of the actual circuit.
The circuit is working. When the light sensor is covered, the LED light on.
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