SENSORS/ACTUATORS

Arduino MicroPython Solenoid Lock

This tutorial teaches you how to use an Arduino with MicroPython and a solenoid lock to secure doors, cabinets, or drawers. We will cover:

How to connect a solenoid lock to an Arduino.
How to program the Arduino with MicroPython to control the solenoid lock.

Hardware Preparation

1	×	Arduino Giga R1 WiFi
1	×	USB Cable Type-C
1	×	Solenoid Lock
1	×	Relay
1	×	12V Power Adapter
1	×	DC Power Jack
1	×	(Recommended) Screw Terminal Block Shield for Arduino Uno/Mega/Giga
1	×	(Recommended) Breadboard Shield For Arduino Uno/Mega/Giga
1	×	(Recommended) Enclosure For Arduino Giga

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 Solenoid Lock

The solenoid lock, also known as the electric strike lock, is used to lock or unlock things like cabinets, drawers, and doors.

Pinout

The solenoid lock has two wires.

Attach the red wire with the plus (+) sign to the 12V DC power source.
Attach the black wire with the minus (-) sign to the ground (GND) of the DC power source.

How It Works

When the solenoid lock receives power, the locking bar extends to lock the door.
When the solenoid lock is not powered, the locking bar pulls back to unlock the door.

※ NOTE THAT:

The solenoid lock typically needs a 12V, 24V, or 48V power supply. Don't connect the solenoid lock directly to the Arduino pin; instead, use a relay to connect it to the Arduino.

If the solenoid lock is connected to a relay set to normally open:

When the relay is open, the door stays unlocked.
When the relay is closed, the door stays locked.

You can connect an Arduino to the solenoid lock through the relay and program the Arduino to control the lock. If you're new to relay or MicroPython programming for the Arduino, I recommend checking out the below tutorial:

Arduino MicroPython Relay tutorial..

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino MicroPython Code

This code will lock and unlock the door every five seconds.

""" This Arduino MicroPython script was developed by newbiely.com This Arduino MicroPython script is made available for public use without any restriction For comprehensive instructions and wiring diagrams, please visit: https://newbiely.com/tutorials/arduino-micropython/arduino-micropython-solenoid-lock """ from machine import Pin import time RELAY_PIN = 'D5' # The Arduino Giga WiFi pin D5 connected to the Solenoid Lock via relay pin # Initialize the relay pin as an output relay = Pin(RELAY_PIN, Pin.OUT) # Infinite loop while True: relay.value(1) # lock the door for 5 seconds time.sleep(5) relay.value(0) # unlock the door for 5 seconds time.sleep(5)

Detailed Instructions

Here’s instructions on how to run the above MicroPython code on Arduino with Thonny IDE:

Make sure Thonny IDE is installed on your computer.
Make sure MicroPython firmware is installed on your Arduino board.
If you are new to Arduino with MicroPython, see the Getting Started with Arduino and MicroPython.
Connect the Arduino board to the solenoid lock according to the provided diagram.
Connect the Arduino board to your computer with a USB cable.
Open Thonny IDE and go to Tools Options.
Under the Interpreter tab, select MicroPython (generic) from the dropdown menu.
Select the COM port corresponding to your Arduino board (e.g., COM33 on Windows or /dev/ttyACM0 on Linux).
Copy the provided Arduino MicroPython code and paste it into Thonny's editor.
Save the MicroPython code to your Arduino by:

Clicking the Save button or pressing Ctrl+S.
In the save dialog, choose MicroPython device and name the file main.py.

Click the green Run button (or press F5) to execute the code.
Check the position of the lock tongue.

Video Tutorial

Learn More

Arduino MicroPython Electromagnetic Lock

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