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Practical Electronics
Image Gallery: Lab 9
All images in this gallery are courtesy of OCW.
A photocell.
An op amp.
A schematic with the properties of a light sensing circuit.
Resistance value (in kilo ohms) when light strikes the photocell.
Resistance value (in kilo ohms) when no light strikes the photocell.
A student measures several resistance values of a photocell.
Various configurations for a light sensing circuit.
Light sensing circuit response when light strikes the photocell.
Light sensing circuit response when no light strikes the photocell.
A red LED is lit when no light strikes the photocell.
A green LED is lit when light strikes the photocell.
A 555 timer IC.
A diagram of a light-triggered alarm circuit.
Initial setup of the light-triggered alarm circuit.
When light is blocked, the light-triggered alarm circuit briefly lights a green LED.