Motion-Activated Night Light

Overview

A PIR module signals the board when something moves; the board lights an LED for a set time.

Build Steps

1. 1

   Build the LED branch

   Place an LED and a 220 Ω resistor on the breadboard, driven from a digital pin.

2. 2

   Mount the PIR

   Wire to power, ground and an input. Let it settle for a minute after power-up.

3. 3

   Write the hold timer

   Switch on at motion and off a fixed interval after the last trigger using millis().

4. 4

   Test the field of view

   Walk through from different angles and tune the sensitivity dial.