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Electronics, sensors, robotics kits, PC components, peripherals — everything Unik Systems carries, in one place.
DHT11 Digital Temperature and Humidity Sensor Module 3.3V-5V for Arduino & Raspberry Pi
[Temperature Sensor] The DHT11 Digital Temperature and Humidity Sensor Module is a reliable and cost-effective sensor designed to measure ambient temperature and relative humidity. It combines a capacitive humidity sensing element and a thermistor with a built-in digital signal processing unit, providing calibrated digital output directly to microcontrollers. In addition, the DHT11 offers stable performance and excellent long-term reliability, making it suitable for environmental monitoring and automation applications. As a result, it is widely used in weather stations, smart home systems, greenhouse monitoring, HVAC systems, and educational electronics projects. Because the module includes the required pull-up resistor, interfacing with microcontrollers becomes simple and straightforward. Furthermore, only three connections are required: VCC, GND, and Data Output. The sensor operates from a wide voltage range of 3.3V to 5.5V DC, ensuring compatibility with Arduino, Raspberry Pi, ESP32, STM32, NodeMCU, and other development boards. Moreover, readily available libraries and example codes allow quick integration into projects. The DHT11 utilizes advanced digital signal acquisition technology and dedicated temperature-humidity sensing techniques to ensure accurate and dependable measurements. 🔹 Key Features Measures temperature and humidity simultaneously Calibrated digital signal output Low power consumption High reliability and long-term stability Capacitive humidity sensing technology Built-in pull-up resistor on module Compatible with Arduino, ESP32, Raspberry Pi, and STM32 Simple 3-wire interface Easy integration into IoT projects Compact and lightweight design 🔹 Technical Specifications Sensor Model: DHT11 Operating Voltage: 3.3V – 5.5V DC Output Type: Digital Serial Output Humidity Measurement Range: 20%RH – 90%RH Humidity Accuracy: ±5%RH Humidity Resolution: 1%RH Temperature Measurement Range: 0°C – 50°C Temperature Accuracy: ±2°C Temperature Resolution: 1°C Sampling Rate: 1Hz (One Reading Per Second) Long-Term Stability: < ±1%RH/Year Interchangeability: Fully Interchangeable Sensor Technology: Capacitive Humidity Sensor + Thermistor 🔹 Pin Configuration Pin 1 (VCC): 3.3V – 5.5V DC Power Supply Pin 2 (DATA): Digital Serial Data Output Pin 3 (GND): Ground 🔹 Applications This sensor module is suitable for: Arduino projects Raspberry Pi projects ESP32 projects IoT systems Weather monitoring stations Smart home automation Greenhouse monitoring HVAC control systems Environmental monitoring Educational electronics projects 🔹 Package Includes 1 × DHT11 Digital Temperature and Humidity Sensor Module
Out of stock1.3 Inch I2C IIC 128×64 OLED Display Module – White
[LED/LCD Display Module] The 1.3 Inch I2C 128×64 OLED Display Module is a compact, high-contrast display designed for Arduino, ESP32, NodeMCU, Raspberry Pi, and other microcontroller-based projects. This module uses OLED (Organic Light Emitting Diode) technology, providing bright white pixels with excellent contrast and wide viewing angles. Powered by the SSH1106 controller chip, the display offers smooth graphics rendering and reliable performance. With a resolution of 128×64 pixels, it can display text, graphics, icons, and sensor data clearly even in small embedded systems. The module communicates using the I2C (IIC) interface, requiring only 4 pins (VCC, GND, SDA, SCL), which helps save valuable GPIO pins on your microcontroller. It operates within a voltage range of 3.3V to 5V, making it compatible with most development boards. Unlike traditional LCD displays, OLED displays do not require a backlight because each pixel emits its own light. This results in lower power consumption, better contrast, and faster response times. Due to its compact size, lightweight design, and simple wiring, the display module is ideal for IoT devices, sensor monitors, battery indicators, portable electronics, robotics projects, and DIY electronics applications. ⭐ Features 1.3 Inch OLED Display Module 128 × 64 pixel resolution White pixel display SSH1106 display controller I2C / IIC communication interface Requires only 4 pins High contrast and wide viewing angle Low power consumption Compatible with Arduino, ESP32, NodeMCU, Raspberry Pi Ideal for embedded and IoT projects 🔧 Technical Specifications Display Size: 1.3 inch Resolution: 128 × 64 pixels Controller Chip: SSH1106 Display Area: 34.5 × 19 mm Interface Type: IIC / I2C Pixel Color: White Driving Voltage: 3.3V – 5V Operating Temperature: -40°C to 70°C Physical Dimensions Length: 35.5 mm Width: 33.5 mm Height: 4 mm Weight: 7 g 📦 Package Includes 1 × 1.3 Inch 128×64 OLED Display Module (White)
DS3231 RTC Memory Module Precise Real Time Clock I2C-AT24C32
[Clock Module] The DS3231 RTC Real Time Clock Module is a precision timing module designed to provide accurate date and time information even when the main system power is unavailable. It features the highly accurate DS3231 RTC IC along with an onboard AT24C32 EEPROM memory chip for storing user data. In addition, the module includes a built-in temperature-compensated crystal oscillator (TCXO), which significantly improves timekeeping accuracy compared to conventional RTC modules. As a result, it offers excellent long-term stability with minimal drift. Because of its battery backup capability, the RTC continues to maintain accurate time and calendar information during power outages. Furthermore, the module automatically manages switching between the main power source and backup battery. The onboard AT24C32 EEPROM provides non-volatile storage for user settings, calibration values, and project data. Moreover, the module communicates through the standard I2C interface, making integration simple with Arduino, Raspberry Pi, ESP32, STM32, NodeMCU, and other microcontroller platforms. The DS3231 keeps track of seconds, minutes, hours, day, date, month, and year while automatically compensating for leap years up to the year 2100. ⚠️ Note: CR2032 backup battery is not included. 🔹 Key Features High-accuracy DS3231 RTC IC Built-in temperature-compensated crystal oscillator (TCXO) Integrated AT24C32 EEPROM memory Battery backup support Automatic leap-year compensation Two programmable alarms Programmable square-wave output Digital temperature sensor output I2C communication interface Low power consumption Excellent long-term timekeeping stability Compatible with Arduino, ESP32, Raspberry Pi, and STM32 🔹 Technical Specifications RTC IC: DS3231 EEPROM IC: AT24C32 Communication Protocol: I2C Operating Voltage: 3.3V – 5V DC Time Format: 12-Hour / 24-Hour Calendar Support: Day, Date, Month, Year Leap Year Compensation: Valid Up To 2100 Alarm Functions: 2 Programmable Alarms Square Wave Output: Programmable Temperature Sensor Accuracy: ±3°C Backup Battery: CR2032 (Not Included) Data Storage: 32Kb EEPROM (AT24C32) Low Power Operation: Yes 🔹 Pin Configuration VCC – Power Supply (3.3V – 5V) GND – Ground SDA – I2C Data Line SCL – I2C Clock Line Arduino UNO Connection SDA → A4 SCL → A5 VCC → 5V GND → GND 🔹 Applications This RTC module is suitable for: Arduino projects Raspberry Pi projects ESP32 projects Data loggers Digital clocks IoT systems Automation systems Time-stamped monitoring systems Industrial controllers Embedded electronics projects 🔹 Package Includes 1 × DS3231 RTC Real Time Clock Module with AT24C32 EEPROM
ESP8266 NodeMCU CP2102 ESP-12E WiFi Development Board
[ESP Modules] ESP8266 NodeMCU CP2102 ESP-12E WiFi Development Board ESP8266 ESP-12E • CP2102 USB Interface • Built-in WiFi • Arduino & Lua Compatible • IoT Development Board The ESP8266 NodeMCU CP2102 ESP-12E WiFi Development Board is a compact and powerful development board designed for IoT (Internet of Things), wireless communication, home automation, robotics, and embedded system projects. Based on the highly popular ESP8266 ESP-12E WiFi module, it combines a 32-bit microcontroller, WiFi connectivity, and a CP2102 USB-to-Serial interface on a single breadboard-friendly board. The board comes preloaded with NodeMCU firmware, allowing easy programming using Lua scripting, while also offering full compatibility with the Arduino IDE, making it suitable for both beginners and advanced developers. With integrated 802.11 b/g/n WiFi, TCP/IP networking, multiple GPIO pins, PWM, I2C, SPI, and UART interfaces, it provides everything required for rapid IoT prototyping and wireless application development. The onboard CP2102 USB interface, 3.3V voltage regulator, and logic-level conversion circuitry allow direct connection to a computer for programming and power, eliminating the need for external USB-to-Serial converters. ⭐ Features ESP8266 ESP-12E WiFi module Built-in CP2102 USB-to-Serial interface 802.11 b/g/n WiFi connectivity Integrated TCP/IP protocol stack 32-bit processor with onboard memory Compatible with Arduino IDE, Lua, and NodeMCU firmware Breadboard-friendly compact design Multiple GPIO pins Supports PWM, I2C, SPI, and UART Onboard 3.3V voltage regulator Logic-level conversion circuitry included Low power consumption Ideal for IoT and wireless projects Easy plug-and-play programming 📋 Technical Specifications Product Type: WiFi Development Board Model: ESP8266 NodeMCU ESP-12E Microcontroller: ESP8266EX WiFi Standard: IEEE 802.11 b/g/n USB Interface: CP2102 Operating Voltage: 3.3V Input Voltage: 5V via Micro USB Flash Memory: 4MB CPU: 32-bit Tensilica L106 Clock Frequency: 80MHz / 160MHz GPIO Pins: Multiple Digital I/O Communication Interfaces: UART, SPI, I2C PWM Support: Yes ADC: 1 Channel (10-bit) USB Connector: Micro USB Firmware: NodeMCU (Preloaded) Programming Support: Arduino IDE, Lua, ESP8266 SDK Board Size: Approx. 58 × 31 mm 🔧 Applications IoT (Internet of Things) Projects Home Automation Smart Lighting Systems WiFi Sensor Nodes Wireless Data Logging Robotics Projects Arduino WiFi Projects ESP8266 Development Remote Monitoring Systems MQTT Applications Web Server Projects Smart Agriculture Industrial Automation DIY Electronics Educational Projects 📦 Package Includes 1 × ESP8266 NodeMCU CP2102 ESP-12E WiFi Development Board ⚠️ Note Operates at 3.3V logic levels. Install the CP2102 USB driver if the board is not detected by your computer. Use a good quality Micro USB cable for programming and power. Product appearance may vary slightly depending on the manufacturing batch.
Out of stockESP-12E: ESP8266 Serial Port WIFI Wireless Transceiver Module For Arduino
[ESP Modules] This is ESP-12E: ESP8266 Serial Port WIFI Wireless Transceiver Module For Arduino. This small WIFI transceiver is the perfect solution for home Automation and IoT applications. It can be the replacement of your NRF24L01, it can talk to your WIFI router directly through the UART MCU’s (Rx, Tx). The ESP-12 module is one of the most complete of the ESP family as it allows you to use the biggest amount of pins of all of them. You can program this module to work stand alone with the Arduino IDE or with LUA as NodeMCU. The system is equipped with ESP8266 manifested leading features are: energy saving VoIP quickly switch between the sleep/wake patterns, with low-power operation adaptive radio bias, front-end signal processing functions. The ESP8266-03 is one of the smallest versions of this module. It includes a built-in ceramic antenna. Features : WS2812 Led on board. 802.11 b/g/n Wi-Fi Direct (P2P), soft-AP Integrated TCP/IP protocol stack Integrated TR switch, balun, LNA, power amplifier and matching network Integrated PLL, regulators, DCXO and power management units +19.5dBm output power in 802.11b mode Power down leakage current of <10uA Integrated low power 32-bit CPU could be used as an application processor SDIO 1.1 / 2.0, SPI, UART STBC, 1×1 MIMO, 2×1 MIMO A-MPDU & A-MSDU aggregation & 0.4ms guard interval Wake up and transmit packets in < 2ms Standby power consumption of < 1.0mW (DTIM3) Access Point and Station Modes. Package Includes : 1 x ESP-12E: ESP8266 Serial Port WIFI Wireless Transceiver Module For Arduino
ESP8266 D1 Mini V2 NodeMcu Lua WIFI IOT Development Board
[ESP Modules] D1 Mini V2 NodeMcu Lua WIFI IOT Development Board is a mini WIFI board based on ESP-8266EX. 11 digital input/output pins, all pins have interrupt/PWM/I2C/one-wire supported(except D0) 1 analog input(3.3V max input) and a Micro USB connection. The development board features WiFi-SoC ESP8266 and is made for fast Internet-of-Things (IoT) prototyping. It is flashed with the latest firmware version and can be set up and programmed right away with the onboard micro USB connection. With only a few lines of code, the NodeMCU Dev Kit connects to your local network and ready for control by other network members like computers and smartphones. The d1 mini is an ESP8266 development board that is compact, versatile, and very easy to use with the Arduino IDE. It supports natively by the Expressive SDK. Features : Use BRT (Bias Resistor Transistor) Easier into flash mode. 30% increase in radiating area Good stability. On-Board Switching Power Supply Specifications: Microcontroller ESP-8266EX Flash Memory 4MB Digital I/O Pins 11 (all I/O pins have interrupt/PWM/I2C/one-wire capability, except for D0) Analog Input Pins 1 (3.2V max input) Operating Voltage 3.3V Output 5V Compatible with Arduino, NodeMCU, and MicroPython Package Includes : 1 x D1 Mini V2 NodeMcu Lua WIFI IOT Development Board 2 x Long female pin 2 x Short female pin 2 x Normal pin
0.96 Inch I2C/IIC 128×64 OLED Display Module Blue (4 Pin)
[LED/LCD Display Module] The 0.96 Inch I2C/IIC OLED Display Module (128×64) is a compact and efficient display designed for microcontroller and embedded system applications. Based on OLED (Organic Light-Emitting Diode) technology, the display provides bright blue pixels with excellent contrast and wide viewing angles. Unlike traditional LCD displays, OLED displays are self-emitting, meaning they do not require a backlight. This results in lower power consumption, higher brightness, and better contrast, making OLED displays ideal for portable electronics and embedded systems. The module uses the popular SSD1306 driver controller, allowing easy integration with development platforms such as Arduino, ESP8266, ESP32, Raspberry Pi, STM32 and other microcontrollers. With its I2C/IIC communication interface, the display requires only 4 pins (VCC, GND, SCL, SDA), saving valuable GPIO pins on your microcontroller. It supports widely available libraries such as Adafruit SSD1306 and U8g2, making it simple to display text, graphics, icons, and sensor data. Thanks to its high brightness, ultra-thin design, wide operating temperature range, and low power consumption, the 0.96″ OLED display module is widely used in IoT devices, robotics, wearable electronics, sensor monitoring systems, and DIY electronics projects. ⭐ Key Features 0.96 inch OLED display module 128 × 64 pixel resolution Blue monochrome display SSD1306 display controller I2C / IIC communication interface Requires only 4 connection pins High brightness and high contrast Wide viewing angle Low power consumption Compatible with Arduino, ESP32, NodeMCU, Raspberry Pi 🔧 Technical Specifications Display Size: 0.96 inch Resolution: 128 × 64 pixels Display Type: OLED (Organic Light Emitting Diode) Display Color: Blue Controller Chip: SSD1306 Interface Type: I2C / IIC Working Voltage: 3.3V – 5V Communication Pins: VCC, GND, SCL, SDA Driver Support: Arduino / Raspberry Pi libraries 📌 Interface Pin Configuration Pin Function VCC 3.3V – 5V Power Supply GND Ground SCL Serial Clock SDA Serial Data 🎯 Applications Arduino projects ESP32 / ESP8266 IoT devices Sensor data display Robotics systems Battery monitors Weather stations DIY electronics projects 📦 Package Includes 1 × 0.96 Inch I2C/IIC 128×64 OLED Display Module Blue (4 Pin)