ESP32 - Solenoid Lock
The Solenoid Lock is also known as the Electric Strike Lock. It can be use to lock/unlock cabinet, drawer, door. This tutorial instructs you how to use ESP32 to control the solenoid lock.
An alternative to the Solenoid Lock is Electromagnetic Lock. You can learn more in ESP32 - Electromagnetic Lock tutorial
Hardware Used In This Tutorial
|1||×||ESP-WROOM-32 Dev Module|
|1||×||USB Cable Type-C|
|1||×||12V Power Adapter|
|1||×||(Optional) DC Power Jack|
|1||×||(Recommended) ESP32 Screw Terminal Adapter|
Or you can buy the following sensor kit:
|1||×||DIYables Sensor Kit 30 types, 69 units|
Introduction to Solenoid Lock
Solenoid Lock includes two wires:
- Positive (+) wire (red): needs to be connected to 12V of DC power supply
- Negative (-) wire (black): needs to be connected to GND of DC power supply
How It Works
- When the Solenoid Lock is powered, the lock tongue (strike) is extended ⇒ the door is locked
- When the Solenoid Lock is NOT powered, the lock tongue (strike) is retracted ⇒ the door is unlocked
※ NOTE THAT:
The solenoid lock usually uses 12V, 24V or 48V power supply. Therefore, we CANNOT connect the solenoid lock directly to ESP32 pin. We have to connect it to ESP32 pin via a relay
If we connect the solenoid lock to a relay (normally open mode):
- When relay is open, door is unlocked
- When relay is closed, door is locked
By connecting ESP32 to the relay, we can program for ESP32 to control the solenoid lock. Learn more about relay in ESP32 - Relay tutorial.
This image is created using Fritzing. Click to enlarge image
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
The below code lock/unlock the door every 5 seconds
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- Copy the above code and paste it to Arduino IDE
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- See the the lock tongue's state
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