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.
