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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