Image Gallery: Lab 9

Labs: Lab 1 | Lab 3 | Lab 4 | Lab 5 | Lab 6 | Lab 7 | Lab 9

Projects: Lecture 10 | Lab 10 | Lecture 12 | Lab 11 | Lab 12 - Color Organ | Lab 12 - Sunflower

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.

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