Nightlight Circuit Design

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A nightlight circuit using a light-dependent resistor as the sensor, a 2N2222 transistor as the switch, and two potentiometers for adjustment.

Source book: Moving Rainbow
Kit page: https://dmccreary.github.io/moving-rainbow/kits/nightlight/
Printable one-pager: nightlight-one-pager.html

Features

• Uses the 10K Potentiometer
• Uses the LDR Photoresistor

Benefits

• Free, open lessons: the Moving Rainbow textbook has the kit page, wiring, and MicroPython code.
• Classroom friendly: built on a solderless breadboard or no-solder connectors.
• Real-world data: students read sensors and turn measurements into decisions.
• Budget: about \(4–\)6 (estimate: breadboard $2, photoresistor and 2N2222 transistor under $1 together, two potentiometers about $1, an LED and resistors).

Parts

• 10K Potentiometer — Input knob
• LDR Photoresistor — Sensor
• 830-Point Breadboard ($1.10) — Breadboard