Arduino project · Smart doors and home · Easy
RFID Guest and Owner Lights
The owner card lights green and the guest card lights yellow.
What you will learn
- How each card has its own number
- How to treat people differently
- How hotels and offices use cards
How it works
Card A lights the green LED, card B lights the yellow LED. Each light goes off when the card is gone.
Try this next
- Add a different sound for each card.
- Allow the guest only in daytime.
- Show the name on an LCD.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
Owner and guest at the front door
Pick card A or card B in the simulator. Either known card opens the door; an unknown card leaves it locked with the red lamp on.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- RFID card = who is at the door
- LEDs = which person was recognised