Arduino project · Buttons and switches · Medium
nRF24 Radio Remote: Four LEDs
An nRF24L01 radio receives key numbers and lights four LEDs.
What you will learn
- How a 2.4 GHz radio differs from 433 MHz
- How SPI wires connect the radio
- Why the radio needs a 3.3 V supply
How it works
The receiver gets the key number sent by a transmitter Arduino. Each LED shows one key.
Try this next
- Send a temperature number instead.
- Add acknowledgement back to the sender.
- Use it to remote a car.
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
Four lamps on a radio remote
Press a button on the transmitter. The matching lamp lights in the real room.
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.
- Radio receiver = the signal from the remote
- LEDs = the lamps