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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
Only 1 leftIOT Smarthome Kit
MCU: ESP8266/ESP32. Modules: 1–4 channel relay (optocoupled preferred), PIR, LDR, DHT. Control: app/web dashboard. Protocols: MQTT/HTTP. Power: 5V input. Properly isolated AC relay use.
ESP32 38-Pin Development Board – IoT Microcontroller with WiFi & Bluetooth
[ESP Modules] Description The ESP32 38-Pin Development Board is a versatile and cost-effective microcontroller platform perfect for a wide range of IoT, automation, and wireless communication projects. Powered by the ESP32 SoC, this board offers integrated WiFi and Bluetooth (BLE) capabilities, making it ideal for developing smart home devices, industrial control systems, robotics, and DIY electronics. For the best IoT experience, you can pair this board with our LoRa SX1278 Module for long-range communication or integrate it with our 0.96-inch OLED Display for real-time data display. Need reliable power control? Combine it with our 2-Channel Relay Module with Optocoupler for safe switching of external devices. Compatible with popular platforms like Arduino IDE, MicroPython, and PlatformIO, this ESP32 board is user-friendly for both beginners and professionals. The board features 38 GPIO pins, enabling you to connect a variety of sensors, actuators, and other peripherals—available in our IoT Components category. Key Features: ESP32 Dual-Core 32-bit LX6 Processor Built-in 2.4 GHz WiFi and Bluetooth 4.2 (BLE) 38 GPIO Pins supporting multiple digital and analog functions Interfaces: UART, SPI, I2C, PWM, ADC, DAC Ultra-low power operation modes ideal for battery-powered IoT devices Supports Arduino IDE, MicroPython, and other environments Onboard micro-USB connector for easy power and programming Reset and boot buttons for firmware flashing Breadboard-friendly form factor Applications: IoT development projects Smart home automation – compatible with Vihaan IoT Gateway Solutions Wireless data logging systems Robotics and drone controllers Industrial monitoring devices Sensor networks – connect with our DHT11/DHT22 Temperature Sensors Specifications: Chipset: ESP32 (Generic) Operating Voltage: 3.3V (5V tolerant inputs) Flash Memory: 4MB Connectivity: WiFi IEEE 802.11 b/g/n, Bluetooth 4.2 BLE Interfaces: GPIO, UART, SPI, I2C, ADC, DAC, PWM USB Interface: Micro USB Form Factor: 38-Pin, breadboard compatible Package Includes: 1 x ESP32 38-Pin Generic Development Board
NY-D01 100A Digital Display Spot Welding Controller Board
[Spot Welding Parts] The principle of silicon-controlled phase shifting triggering is adopted to adjust the time and the current to achieve welding. With a digital display, you can directly see the time and current. Optocoupler isolates the strong and weak electricity, making the operation safer. Using a high-precision single potentiometer to ensure reliable and convenient input. The design of a reliable zero-crossing detection circuit ensures the SCR phase shift accuracy. Made of high-quality PCB, the control board is long-lasting. The module is 8cm long, 6cm wide, and 2cm high. It is developed for DIY or simple resistance welding. Features: 1 The use of STM8 industrial control center microcontroller. 2 Strong and weak electricity through optocoupler insulation, safe operation. 3 The power line and foot switch line adopts the bolt the quick connect terminal, more convenient and reliable. 4 Input time, current using a high-precision simple potentiometer, to ensure reliable, convenient input 5 On-board power supply, state, foot, trigger indicator, work status clearly visible. 6 The design of reliable zero-crossing detection circuit to ensure that the SCR phase shift accuracy. 7 The controller is compatible with 100A scr. 8 Digital control interface, you can display the current time and current settings. 9 Input time of 1-50, cycle unit (1 cycles is 20 ms), current input (30-99%), Material Plastic+Metal Current Input 30-99% Microcontroller. STM8 Time input 1-50 Shipping Weight 0.12 kg Shipping Dimensions 8 × 6 × 2 cm Package Includes: 1 x NY-D01 100A Digital Display Spot Welding Controller Board
NY-D01 40A Digital Display Spot Welding Controller Board
[Spot Welding Parts] This is a NY-D01 40A Digital Display Spot Welding Controller Board. The principle of silicon controlled phase shifting triggering is adopted to adjust the time and the current to achieve welding. With a digital display, you can directly see the time and current. Optocoupler isolates the strong and weak electricity, making the operation safer. Using a high-precision single potentiometer to ensure reliable and convenient input. The design of a reliable zero-crossing detection circuit ensures the SCR phase shift accuracy. Made of high-quality PCB, the control board is long-lasting. The module is 8cm long, 6cm wide and 2cm high. It is developed for DIY or simple resistance welding. Connection Diagram: Features: 1 The use of STM8 industrial control centre microcontroller. 2 Strong and weak electricity through optocoupler insulation, safe operation. 3 The power line and footswitch line adopts the bolt the quick connect terminal, more convenient and reliable. 4 Input time, current using a high-precision simple potentiometer, to ensure reliable, convenient input 5 On-board power supply, state, foot, trigger indicator, work status clearly visible. 6 The design of a reliable zero-crossing detection circuit to ensure that the SCR phase shift accuracy. 7 The controller is compatible with 40A SCR. 8 Digital control interface, you can display the current time and current settings. 9 Input time of 1-50, cycle unit (1 cycles is 20 ms), current input (30-99%), Package Includes: 1 x NY-D01 40A Digital Display Spot Welding Controller Board
2 Channel 5V Relay Module with Optocoupler
[Relays] This is a 5V, 10A 2-Channel Relay interface board. It can be used to control various appliances, and other equipments with large current. It can be controlled directly with 3.3V or 5V logic signals from a microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic). It has a 1×4 (2.54mm pitch) pin header for connecting power (5V and 0V), and for controlling the 2 relays. The pins are marked on the PCB:- GND – Connect 0V to this pin. IN1 – Controls relay 1, active Low Relay will turn on when this input goes below about 2.0V IN2 – Controls relay 2, active Low Relay will turn on when this input goes below about 2.0V VCC – Connect 5V to this pin. Is used to power the opto couplers Specification:- High current relay, AC250V 10A, DC5V 10A 2 LEDs to indicate when relays are on Works with logic level signals from 3.3V or 5V devices Opto isolation circuitry * Product Images are shown for illustrative purposes only and may differ from actual product.
Out of stock8mm High Quality LED- Clear Lens-Cool White
[DIP LED] This White colour LED type with a clear lens is a low power consumption LED with a wide viewing angle, Ideal for backlight and indicator. It is widely used in pin Status, optoelectronics sensors, and fun blinky displays. This is a very basic 8 mm LED with a clear lens. It has a typical forward voltage of 3.3V and a rated forward current of 100 mA. SPECIFICATION LED Diameter 8mm Emitted Colour Cool White Viewing Angle 120° Forward Voltage 3-3.4V Forward Current 100mA Lens Type Clear Quantity 1
8mm High Quality LED- Clear Lens-Warm White Brand Superlight
[DIP LED] This Yellow colour LED type with a clear lens is a low power consumption LED with a wide viewing angle, Ideal for backlight and indicator. It is widely used in pin Status, optoelectronics sensors, and fun blinky displays. This is a very basic 8 mm LED with a clear lens. It has a typical forward voltage of 3.3V and a rated forward current of 100 mA. SPECIFICATION LED Diameter 8mm Emitted Colour Warm White Viewing Angle 120° Forward Voltage 3-3.4V Forward Current 100mA Lens Type Clear Quantity 1
Out of stockPC817 EL817 SMD-4 Optocoupler Transistor Output
[Semiconductor ICs] PC817 Opto-Coupler is used to provide electrical isolation between two circuits, one part of the circuit is connected to the IR LED and the other to Photo-transistor. It has a wide range of applications such as noise suppression in switching circuits, I/O isolation for MCUs, etc. Features: IC Number: PC817 SMD Packaging. Number of channels: 1 channel Package Includes: 1 x PC817 EL817 SMD-4 Optocoupler Transistor Output.
4 Channel Isolated 5V 10A Relay Module opto coupler For Arduino PIC AVR DSP ARM
[Relay Module] The 4 Channel Isolated 5V Relay Module is a reliable switching interface that enables low-voltage microcontrollers to safely control high-voltage and high-current electrical devices. Featuring four independent relays with opto-isolation, the module provides excellent electrical separation between the control circuitry and load side for enhanced safety and reliability. In addition, each relay can be individually controlled through dedicated input pins, allowing multiple devices to be switched independently. As a result, the module is ideal for home automation, industrial control systems, robotics, IoT projects, and appliance control applications. Because of its opto-coupler isolation design, the relay board helps protect sensitive microcontrollers from electrical noise and voltage spikes. Furthermore, onboard status LEDs provide clear indication of relay activation and power status. The module supports both AC and DC load switching, making it suitable for controlling lamps, fans, pumps, motors, solenoids, and various household appliances. Moreover, the high-quality relay contacts ensure reliable long-term operation under demanding conditions. This relay module is widely used in Arduino projects, Raspberry Pi automation systems, PLC control panels, industrial automation, smart home systems, and embedded electronics applications. 🔹 Key Features 4 independent relay channels Opto-isolated input design Supports high and low level triggering Compatible with Arduino, Raspberry Pi, ESP32, PIC, AVR, ARM, and PLC High-current relay contacts LED power and relay status indicators Electrical isolation between control and load circuits Suitable for AC and DC load switching Easy interfacing with microcontrollers Industrial-grade design 🔹 Technical Specifications Product Type: 4 Channel Relay Module Operating Voltage: 5V DC Number of Channels: 4 Relay Type: JQC3F-5VDC-C / SRD-05VDC-SL-C / FL-3FF-S-Z (Random) Contact Configuration: SPDT (NO, COM, NC) Maximum AC Load: 250V AC, 10A Maximum DC Load: 30V DC, 10A Trigger Voltage: Approx. 1V – 5V Isolation Method: Opto-Coupler Isolation Input Interface: Standard TTL Control Signal Trigger Mode: High-Level / Low-Level Trigger Status Indicators: Power LED and Relay LEDs Mounting Holes: Yes 🔹 Pin Configuration Control Side VCC – 5V Power Supply GND – Ground IN1 – Relay Channel 1 Control IN2 – Relay Channel 2 Control IN3 – Relay Channel 3 Control IN4 – Relay Channel 4 Control Relay Output Terminals For each channel: COM – Common Terminal NO – Normally Open Contact NC – Normally Closed Contact 🔹 Applications This relay module is suitable for: Arduino projects Raspberry Pi projects ESP32 projects Home automation systems Industrial automation PLC control systems Smart home devices Lighting control Motor and pump control Appliance switching IoT projects 🔹 Package Includes 1 × 4 Channel 5V 10A Opto-Isolated Relay Module
Out of stock5V 6 Channel Low Level Relay Module with Light Coupling
[Relay Module] It is a 5V 6 Channel Low-Level Relay Module with Light Coupling. The relay normally open interface maximum load: AC 250V/10A, DC 30V/10A. With optocoupler isolation, strong drive capability, stable performance; trigger current 5mA, module working voltage: DC 5V. Each channel of the module can be triggered by a jumper to set a high level or a low level. Fault-tolerant design, even if the control line is disconnected, the relay will not move. With status indicator: power (green), 6-channel relay status indicator (red). All module size interfaces can be directly connected through the terminal block, which is convenient and practical. Features: 6-way relay output module contact capacity is 10A 250V. input IN1, IN2, IN3, IN4, IN5, IN6 signal, a low level is effective. Using single-chip design, reliable performance, strong anti-interference, no false triggering, superior performance. The trigger terminal has optocoupler isolation, the independent external power supply can trigger completely isolated. Each relay has an activity indicator light. With 4 fixed bolt holes, easy installation. Support all SCM control. It is applicable to the industrial sector, PLC control and home intelligent control. Package Includes: 1 x 5V 6 Channel Low-Level Relay Module with Light Coupling.
1 Channel 12V Relay Module without Optocoupler
[Relay Module] 🔌 12V 1 Channel 7A Relay Module for Arduino, Raspberry Pi & Microcontrollers 12V Trigger • 7A Relay • Compact Design • Ideal for Automation & DIY Projects The 12V 1 Channel 7A Relay Module is a compact and reliable relay board designed to control AC and DC loads using low-voltage control signals from microcontrollers and development boards. Operating on a 12V DC trigger voltage, it can be directly interfaced with Arduino, Raspberry Pi, ESP32, ESP8266, AVR, PIC, 8051, ARM, and other embedded systems. The module is equipped with a high-quality 7A electromagnetic relay capable of switching 250V AC or 30V DC loads. It features LED indicators for power and relay status, making debugging and operation simple. Standard header pins allow easy connection to development boards, while screw terminals provide secure wiring for external loads. This relay module is ideal for home automation, industrial control, IoT projects, robotics, lighting control, motor switching, and various DIY electronics applications. ⭐ Features Single-channel 12V relay module High-quality 7A electromagnetic relay Compatible with Arduino, Raspberry Pi, ESP32, AVR, PIC, ARM and more 12V DC trigger input LED power and relay status indicators Standard header pin interface Screw terminal output connections Compact PCB design Reliable and stable operation Easy installation 📋 Technical Specifications Product Type: Relay Module Relay Channels: 1 Operating Voltage: 12V DC Trigger Voltage: 12V DC Trigger Current: Approx. 20mA Maximum Switching Voltage (AC): 250V AC Maximum Switching Current (AC): 7A Maximum Switching Voltage (DC): 30V DC Maximum Switching Current (DC): 7A Relay Contact Type: SPDT (NO / NC / COM) Connection Type: Screw Terminal + Header Pins Operating Temperature: -40°C to +85°C Board Dimensions: Approx. 48 × 29 × 17 mm (May vary slightly by manufacturer) Weight: Approx. 15g 🔧 Applications Suitable for: Arduino Projects Raspberry Pi Projects ESP32 & ESP8266 Projects Home Automation Industrial Automation Smart Switches Lighting Control Fan Control Pump Control Small Motor Switching Security Systems Robotics IoT Projects DIY Electronics 📦 Package Includes 1 × 12V 1 Channel 7A Relay Module ⚠️ Note This module is intended for switching high-voltage AC/DC loads. Always disconnect power before wiring. Product images are for illustrative purposes only. The actual product may vary slightly depending on the manufacturing batch.