SENSORS/ACTUATORS

Arduino Nano 33 IoT - Electromagnetic Lock

The electromagnetic lock (also called magnetic lock, maglock, or EM lock) is an important part of the door locking system. This guide shows how to use the Arduino Nano 33 IoT to control the electromagnetic lock.

Hardware Preparation

1	×	Arduino Nano 33 IoT
1	×	Micro USB Cable
1	×	Electromagnetic Lock
1	×	Relay
1	×	12V Power Adapter
1	×	Optionally, DC Power Jack
1	×	Breadboard
1	×	Jumper Wires
1	×	Recommended: Screw Terminal Expansion Board for Arduino Nano
1	×	Recommended: Breakout Expansion Board for Arduino Nano
1	×	Recommended: Power Splitter for Arduino Nano

Or you can buy the following sensor kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .

Overview of Electromagnetic Lock

Electromagnetic Lock Pinout

The electromagnetic lock is made up of two parts:

Armature plate: This part is fixed to the door’s moving section.
Electromagnet: This part is mounted on the door frame. It has two wires that connect to a power source.

When the door is shut, two parts touch each other.

How Electromagnetic Lock Works

When the electromagnet is turned on, it pulls the armature plate and locks. When it is turned off, it does not pull the armature plate and stays unlocked.

The electromagnetic lock runs on high power (12V, 24V, or 48V, for example). Because of this, we need to add a relay between the lock and the Arduino Nano 33 IoT pin. Check out the Arduino Nano 33 IoT Relay tutorial.

If we attach the electromagnetic lock to a relay that is normally open and use an Arduino Nano 33 IoT pin to control it:

When the Arduino Nano 33 IoT pin is low, the relay is turned off and the door stays unlocked.
When the Arduino Nano 33 IoT pin is high, the relay is turned on and the door becomes locked.

Wiring Diagram between Electromagnetic Lock and ES32

The wiring diagram between Arduino Nano and 33 IoT Electromagnetic Lock

This image is created using Fritzing. Click to enlarge image

Arduino Nano 33 IoT Code

The code below locks and unlocks the door every five seconds.

/* * This Arduino Nano 33 IoT code was developed by newbiely.com * * This Arduino Nano 33 IoT code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-electromagnetic-lock */ #define RELAY_PIN 2 // The Arduino Nano 33 IoT pin connected to the electromagnetic lock via the relay // The setup function runs once on reset or power-up void setup() { // initialize digital pin as an output. pinMode(RELAY_PIN, OUTPUT); } // The loop function repeats indefinitely void loop() { digitalWrite(RELAY_PIN, HIGH); // lock the door delay(4000); digitalWrite(RELAY_PIN, LOW); // unlock the door delay(4000); }

Detailed Instructions

If you are new to the Arduino Nano 33 IoT, be sure to check out our Getting Started with Arduino Nano 33 IoT tutorial. Then, follow these steps:

Connect the components to the Arduino Nano 33 IoT board as depicted in the diagram.
Use a USB cable to connect the Arduino Nano 33 IoT board to your computer.
Launch the Arduino IDE on your computer.
Select the Arduino Nano 33 IoT board and choose its corresponding COM port.
Copy the code above and paste it into the Arduino IDE.
Click the Upload button to compile and send the code to the Arduino Nano 33 IoT board.
Bring the armature plate close to the electromagnet.
Watch how the armature plate is pulled toward the electromagnet.

Video Tutorial

Arduino Nano 33 IoT - Button Controls Electromagnetic Lock

Check out the Arduino Nano 33 IoT - Button Controls Electromagnetic Lock tutorial

Language References

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