In this DIY project, we will create a Smart Relay-Controlled Power Strip using the G6B-2114P-US-5VDC relay. This project allows you to control multiple AC-powered devices remotely through low-voltage signals, making it useful for home automation, energy-saving applications, or even a smart workbench setup. The goal of this project is to build a power strip that can turn connected devices on and off with a control switch or a sensor-based trigger. While we won’t use microcontrollers in this version, the relay mechanism will still allow flexible control options.
Understanding the G6B-2114P-US-5VDC Relay
The G6B-2114P-US-5VDC is a compact, high-reliability relay that operates on a 5V DC control signal. It can handle up to 5A at 250V AC, making it perfect for switching small household appliances.
Key Features:
● Coil Voltage: 5V DC ● Contact Rating: 5A at 250V AC ● Compact Size: Ideal for PCB mounting ● Low Power Consumption: Efficient switching
Materials and Components
To build our smart relay-controlled power strip, we’ll need:
Main Components:
G6B-2114P-US-5VDC relay (x2) – Controls the AC power flow
AC power strip (modifiable)– The base for our project
SPDT switch– To manually trigger the relay
5V DC power adapter– Supplies power to the relay
Diode (1N4007)– Protects against voltage spikes
NPN transistor (BC547)– Acts as an intermediate switch
Resistors (1kΩ, 10kΩ)– Ensures proper current flow
Heat shrink tubing and electrical tape– For safety and insulation
Plastic enclosure– Housing for the relay circuit
Step-by-Step Assembly
Step 1: Preparing the Power Strip
Open the power strip casing carefully.
Identify the live wire connections leading to the individual outlets.
Cut the live wire so it can be controlled by the relay switch.
Step 2: Wiring the Relay Module
Coil Side (Low Voltage 5V Control):
● Connect one coil pin of the G6B-2114P-US-5VDC relay to the 5V DC power supply. ● Connect the other coil pin to the collector of the BC547 transistor. ● The transistor’s emitter should be connected to ground. ● Connect a 1kΩ resistor between the transistor’s base and the control switch. ● Add a 1N4007 diode across the relay coil terminals (cathode to 5V, anode to the transistor) to prevent back EMF damage.
Switching Side (AC Load Control):
● Connect the common terminal (COM) of the relay to the live input wire. ● Connect the normally open (NO) terminal to the cut end of the live wire leading to the outlets.
Step 3: Adding Manual Control Switch
Place a SPDT switch to manually control the relay.
One terminal of the switch goes to the 5V DC supply, while the other goes to the transistor base via a 1kΩ resistor.
When the switch is turned ON, it activates the transistor, which energizes the relay, allowing power to flow to the connected devices.
Step 4: LED Indicator for Relay Status
Connect an LED with a 10kΩ resistor in parallel with the relay coil.
The LED will turn on whenever the relay is activated, providing a visual indication.
Step 5: Insulation and Enclosure
Secure all connections using heat shrink tubing and electrical tape to prevent short circuits.
Place the entire circuit inside a plastic enclosure and mount it securely within the power strip casing.
Testing and Usage
Basic Functionality Check
Plug in the modified power strip.
Turn on the SPDT switch and observe:
● The LED indicator should light up. ● The relay should click, completing the circuit and allowing AC power to flow to the connected devices.
Toggle the switch OFF, and the relay should de-energize, cutting off power.
Applications of This Smart Power Strip
● Energy Saving: Prevents standby power consumption when devices are not in use. ● Home Automation: Can be modified to integrate with a microcontroller for smart home systems. ● Workbenches: Easily control multiple tools with one switch.
Enhancements and Future Improvements
1. Sensor-Based Activation
Instead of a manual switch, we can replace it with a motion sensor or temperature sensor, allowing automatic device activation.
2. Wireless Control
Integrating a Wi-Fi or Bluetooth module would enable remote control via a smartphone app.
3. Multi-Relay Expansion
Adding more G6B-2114P-US-5VDC relays allows control of multiple power strips from one circuit.
Conclusion
This Smart Relay-Controlled Power Strip is a simple yet effective DIY project that teaches relay control, circuit safety, and home automation concepts. The G6B-2114P-US-5VDC relay makes it possible to safely switch AC power using a low-voltage control signal. By implementing additional features like sensors or wireless control, this project can be expanded into a fully automated smart power system. If you’re looking for an easy-to-build, practical electronics project, give this one a try! Happy tinkering!
