Automatic Night Light Kit with LDR Sensor – Arduino Uno
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Prices updated: 14 Oct 2026
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About this product
A kit that turns a light on automatically when a room gets dark and off again when light returns. An LDR light sensor changes its value with light level, and the Arduino reads it. When the reading passes a darkness threshold chosen by the learner, three white LEDs switch on. The code uses hysteresis to prevent flickering at the threshold.
Specifications
- Microcontroller
- Arduino Uno
- Light sensor
- LDR (analog output)
- Output
- 3 white LEDs with current-limiting resistors
- Control method
- Threshold with hysteresis
- Estimated build time
- 40 minutes
- Assembly
- Solderless, breadboard
- Difficulty
- Easy
Frequently asked questions
Why are resistors used with the LEDs?
Each LED needs a series resistor to limit its current. Without it, the LED can draw too much current and be damaged, especially when several LEDs are connected.
How do I choose the darkness threshold?
Read the sensor value in bright light and in darkness using Serial Monitor, then choose a value between the two. Set the threshold in the code, and the hysteresis margin keeps the light stable near that value.
