DS3231 Real Time Clock Memory Module with out Battery DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. Real-time clock generator seconds, minutes, hours, day, date, month and year timing and provide valid until the year 2100 leap year compensation DS3231 available in commercial and industrial temperature ranges, using a 16-pin 300mil SO package. DS3231 RTC  is a Precise Real-Time Clock Module with 32Kbit EEPROM and a built-in 10-bit temperature sensor having a resolution of 0.25C. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The ds3231 Arduino is available in commercial and industrial temperature ranges and is offered in a 16-pin, 300-mil SO package.

GD-007 Single Coin Acceptor Coin acceptor modules accept currency coins which can be suitable for various vending machines. Coin acceptor modules are available in multiple categories including single coin acceptors, comparable type coin acceptors, multi-coin coin acceptors, etc. The Single coin acceptor is specially designed to accept only a specific coin. A comparable type of coin acceptor is used to accept the coins that are similar to the coins put aside the coin acceptor. Multi-coin coin acceptors can accept different coins with one machine, and output different signals to the microcontroller.  The coin-accepting sensor device has an inbuilt microcontroller that takes data from the sensor inside the device and collects different coins. Using this data, the microcontroller knows whether this coin needs to be accepted or returned. The device is easily programmed using a push button located on the top. The coin acceptor device gives us an impulse signal on the output pin for every inserted coin and by counting impulses we know how many coins have been inserted. It also has three switches which we use in order to select the type of signal we want to get on the output. The first switch has three positions to select the impulse length. The second switch is used to set the signal to be +5 V(NC) or 0 V(NO). Using the 3rd switch, the precision of the device can be chosen. Applications: Vending Machine Also check BV30 Compact Bill Acceptor offered by Iotcart. It is designed for handling low-value transactions efficiently and securely. The bill acceptor has a compact design, making it suitable for use in vending machines, parking systems, and arcade games. It features enhanced sensing and security for accurate bill validation. The attractive bezel illumination comes in RGB options, providing an eye-catching display. Package Includes: 1 x GD-007 Single Coin Acceptor Specifications: Supply Voltage  DC+12V discrepancy 20% Temperature -10Celsius degree ~ +60Celsius degree Coin thickness 1.2 - 3mm

Analog Sound Sensor Microphone Module for Arduino This is a high-quality Analog Sound Sensor highly sensitive Microphone Module for Arduino used in detecting the loudness in the ambient, the Arduino can collect its output signal and actuate accordingly. You may use it to make some funny interactive works such as a "clap and buzz" to find your lost keys or remote control if you add a buzzer.

4 Power Indicator Battery Detection Module A Power Indicator Battery Detection Module is a gadget that detects the charge level in a battery and displays the remaining power level to the user.It often contains a voltage divider circuit that can convert the battery voltage to a level that a microcontroller or other device can read, as well as an indicator circuit that may display the remaining power level using LEDs or other visual means.The Power Indication Battery Detection Sensor Module you indicated most likely has four LEDs or other indicator lights to indicate different degrees of remaining power, such as a green LED for full power, a yellow LED for medium power, and a red LED for low power. Onboard high precision voltage detection chip and power supply voltage chip.Four onboard battery indicator light-emitting diodes (leds). Three kinds of color display, red, yellow, green, representing 20%, 50%, 80%, 100% of the battery. Set aside all the batteries testing interface and the two positioning hole. By Removing the LEDs and extending their connections to arduino, this module can also be used with all arduino boards. PCB Size: 22.2(mm)x17.2.(mm) Package Includes: 1 x 4 Power Indicator Battery Detection Module Specifications: Voltage 12V Light Type  LED Dimension(mm) 22.2 x 17.2

Metal Detector Sensor Module A metal detector sensor module is a device that uses electromagnetic induction to detect the presence of metal objects. The module typically consists of a transmitter coil that generates a magnetic field, and a receiver coil that detects changes in the magnetic field caused by the presence of metal. When a metal object comes into proximity of the sensor, it will disrupt the magnetic field and the sensor will generate an output signal indicating the presence of metal. These types of sensor can be used in a variety of applications, such as security systems, industrial automation, and even in hobby projects. The output can be digital or analog, some modules can even provide the depth of the metal.You can use this LC Metal detector non-contact metal induction detection module as a metal detector. When it approaches any metal, it makes a sound. This is a module specifically designed to detect metal. The module operates by inducing currents in metal objects and responding when it occurs. A nice onboard buzzer signals when it detects something and an onboard potentiometer allow adjustment of sensitivity. The power cables of the Metal detector non-contact metal induction detection module will need soldering on for the module to function, positive to the outside of the module and negative between the potentiometer and an electrolytic capacitor.

ADXL345 Digital Angle Acceleration Sensor Module The ADXL345 Digital Angle Acceleration Sensor Module is the go-to solution for high-precision movement measurement. Whether you're working on a DIY project or need accurate angle detection, this sensor module delivers. With versatile compatibility supporting both 5V and 3.3V inputs, it seamlessly interfaces with microcontrollers like Arduino. This sensor features wide sensitivity ranges, from +/- 2G to +/- 16G, offering flexibility for various applications. Its noise-resistant design, incorporating the onboard RT9161, ensures faster load speed, making it perfect for noisy power environments. DIY enthusiasts will appreciate its user-friendly design, and its mobile application suitability makes it a valuable tool for multiple scenarios. Made with quality in mind, the ADXL345 promises high-resolution measurements (4mg/LSB) for changes less than 1.0° angle. From skew detection to dynamic acceleration measurement, this sensor module is a versatile choice.

Optical Dust Sensor with Cable This PM2.5 GP2Y1010AU0F Dust Smoke Particle Sensor is an infrared emitting diode (IRED) and a phototransistor is diagonally arranged into this device. It detects the reflected light of dust in the air. Especially, it is effective to detect very fine particles like cigarette smoke. In addition, it can distinguish smoke from house dust by the pulse pattern of the output voltage. The module is mainly used for dust removal equipment alarm equipment, air purification equipment, dust robots, fire alarm, etc. industry equipment can detect smoke particles, pollen spores, and other particles. The sensor has a very low current consumption (20mA max, 11mA typical), and can be powered with up to 7VDC. The output of the sensor is an analog voltage proportional to the measured dust density, with a sensitivity of 0.5V/0.1mg/m3. Applications: Detecting dust in the air.  Air purifier, Air conditioner, the Air monitor. Fire alarm Dust robots Package Includes:  1 x Optical Dust Sensor Specifications Sensor  Optical Dust Sensor Power supply voltage DC5 ± 2V Sensitivity 0.5V / (0.1mg / m3) Dimensions 5 x 4 x 3cms  Weight  25 grams

Piezo Sensor - 20MM The Piezo Sensor is a piezoelectric elements. 20mm is a perfect size for installing in cigar box guitars, foot stompers and other home-made instruments. The sensors can also be used for custom pickup arrangements in more traditional stringed and percussion instruments. An electric pick-up is a sure-fire way to take your cigar box guitar or another build to the NEXT LEVEL, and many builders report that their instruments are much more attractive to potential buyers if they include a pickup. Package Includes: 1 X Piezo Sensor Specifications: Plate Diameter  20mm Element Diameter 14mm Plate Thickness 42mm Lead Length ~50mm Plate Material Brass Resonant Frequency (kHz) 6.3 +/- .6kHz

MC-38 Wired Magnetic House Security Alarm Sensor for Door and Windows MC-38 Wired Door Window Sensor Magnetic Switch Home Alarm System can be used as a door or window security system. It produces the signal when moved away from each other which can be fed to the microcontroller to perform the desired action as per requirement. This sensor is suitable to use for triggering an alarm or ON/OFF light inside a cupboard sliding door. This wired sensor is triggered by the magnet. When the magnet is closed by, the circuit is closed or open if the magnet is far from the sensor. This MC-38 Magnetic Contact Switch Sensor acts like a normal switch so, you can connect to the Ground(GND) pin too. Not necessarily connect to power supply. Note : Normally closed: When the magnet is together, the circuit is conductive( light on); when the magnet is separate, the circuit is not conductive ( light off ).  For example: Install on the door, close door light on. open door light off. Applications: Doors Windows Sliding cupboards Home Security Projects Specifications: Model MC38 Contact Capacity(Max. Switch Current) 0.5A Voltage 100V Rated Power (W) 10 Dimensions 24 x 14 x 8 Weight  8

CJMCU-103 Rotary Angle Sensor Potentiometer Module The CJMCU-103 is a rotary angle sensor module that measures the angular position of a shaft or other rotating object using a potentiometer. A potentiometer is a sort of variable resistor that can be used to measure a shaft's location by altering the resistance as the shaft rotates. A potentiometer is commonly attached to the shaft, and an integrated circuit (IC) turns the potentiometer's resistance into a voltage or digital signal that can be read by a microcontroller or other device. The CJMCU-103 is a low-power, compact device with a wide range of system integration options. It can be used to calculate the angle of a steering wheel, regulate the movement of a robot arm, or detect the angular location of a motor shaft. MCU-103 Rotation Angle Sensor has a dustproof design that protects the interior from dust, which maintains stable performance. It is compatible with high peak lead-free soldering. temperatures. Applications: Used in Switch for automotive, Motor drive unit, Radio control equipment, Electric motor-driven bicycle, etc Package Includes: 1 x Rotary Angle Sensor Specifications Resistance (Ohms) 10k Resistance Tolerance ±30% Mounting Type Surface Mount Mechanical 0° ~ 333.3° Dimensions  3 x 2 x 1cms  Weight  5 grams

Heat Flame Sensor This tiny Flame sensor infrared receiver module ignition source detection module is Arduino compatible and can use to detect flame or wavelength of the light source within 760nm~1100nm also useful for Lighter flame detect at a distance of 80 cm.  Greater the flame, the farther the test distance. It has a Detect angle of  60° and is very sensitive to flame spectrum.  It produces the one-channel output signal at the D0 terminal for further processing like an alarm system or any switching system.  The sensitivity is adjustable with the help of a blue potentiometer given on the board.  Onboard signal output indication, output effective signal is high, at the same time the indicator light up, the output signal can directly connect to microcontroller IO. The flame of the most sensitive sensors flame, the regular light is also a response, generally used for fire alarm purposes. Applications Fire detection Fire alarm Fire fighting robot Drying systems Industrial gas turbines Gas-powered cooking devices Package Includes: 1 x Heat Flame Sensor Specifications: Output Channel 1 Operating Voltage (VDC) 3.3 ~ 5 Mounting Hole (mm) 3 Dimensions (mm) 32 x 14 x 3

INMP441 MEMS High Precision Omnidirectional Microphone Module I2S The INMP441 is a digital MEMS microphone that is omnidirectional and has a bottom port. It is designed to be high-performing and low-power, and the complete solution includes a MEMS sensor, signal conditioning, analog to digital converter, anti-aliasing filter, power management, and a 24-bit I2S interface that is industry-standard.The I2S interface is especially useful because it allows for direct connection to digital processors such as microcontrollers and DSPs without the need for an audio codec. With a high signal-to-noise ratio, the INMP441 is a great option for applications in close proximity. It also has a flat wideband frequency response that results in natural and high-definition sound. Interface definition SCK: Serial data clock for I2S interface WS: Serial data word selection for I2S interface L/R: Left/Right channel selection. When set to low, the microphone outputs a signal on the left channel of the I2S frame. When set to high level, the microphone outputs signals on the right channel SD: Serial data output of the I2S interface. VCC: Input power, 1.8V to 3.3V. GND: power ground NMP441 connection with ESP32 SCK -GPIO14 SD – GPIO32 WS – GPIO15 L/R – GND GND – GND VDD – VDD3.3

Rain Drop Sensor Module The Raindrops Detection sensor module is used for rain detection. This raindrop sensor is also used for measuring rainfall intensity. The rain sensor can be used for all kinds of weather monitoring and translated into output signals and AO. Raindrops Detection Sensor Module Rain Weather Module for Arduino, etc. The rain sensor can be used to monitor a variety of weather conditions and turned into several fixed output signals and Analog outputs. This raindrop sensor module includes a printed circuit board (control board) that “collects” the raindrops. As raindrops are collected on the circuit board, they create paths of parallel resistance that are measured via the op-amp. The lower the resistance (or the more water), the lower the voltage output. Conversely, the less water, the greater the output voltage on the analog pin. A completely dry board, for example, will cause the module to output 5V. The sensor module includes a rain board and a control board that is separate for more convenience. It has a power indicator LED and an adjustable sensitivity through a potentiometer. The module is based on the LM393 op-amp. If you want to know rain sensor working then check our blog What is a Raindrop Sensor? Rain Detector Sensor Applications: The rain detector sensor used in automatic windshield wipers This raindrop sensor module is used in smart agriculture. This rain detection sensor is also used in home automation. Package Includes: 1 x Printed Circuit Board for Rain Water Collection 1 x Control Board with LM393 Voltage Comparator 1 x A 5-Wire Dupont Cable Specifications: Operating voltage 5V Material  FR – 04 Voltage Comparator   LM393 Driver Size(mm) 32x15x9 (LxWxH) Collector Board Size(mm) 54x40x1.5 (LxWxH) Weight  50 grams

12mm Reed Switch/Sensor The 12mm reed switch/sensor is an electrical switch operated by an applied magnetic field. The reed switch contains a pair (or more) of magnetizable, flexible, metal reeds whose end portions are separated by a small gap when the switch is open. The reeds are hermetically sealed in opposite ends of a tubular glass envelope. When the device is exposed to a magnetic field, the two ferrous pins inside the switch pull together and the switch closes. When the magnetic field is removed, The Reed Switch separates and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1.2A. Applications: Home and office automation. Door or windows sensor as a burglar alarm. Package Includes: 1 x 12mm Reed Switch Specifications: Maximum Voltage(V) 24V DC Maximum Operating Current (A) 1.2 Frequency(Hz) 100 Mech. & Electrical Lifecycle ≈ 100,000 Contact Resistance 20mΩ Insulation Resistance (MΩ) 100 Operating Temperature Range (°C) -50 to 140 °C Dimensions 12x2x1mm Weight 1

Rotary Encoder Module The Rotary Encoder Module Brick Sensor is a rotary input device (as in knob) that provides an indication of how much the knob has been rotated AND what direction it is rotating in. This Brick Sensor is a great device for stepper and servo motor control.  You could also use it to control devices like digital potentiometers. M274 360 rotary Degree encoder, is an incremental electro-mechanical device that converts the angular position or motion of a shaft or axle to digital code. The output of incremental encoders provides information about the motion of the shaft, which is typically further processed in processor/controllers into information such as speed, distance, and position. read more : What are Rotary Encoders? Construction & Working Applications: Robotic arm controller Servo and Stepper motor control Precise motor movement Package Includes: 1 x Rotary Encoder Module Specifications: Model KY-040 Cycles per revolution (CPR) 20 Working voltage 0 – 5V Material PCB + Brass Dimensions  3 x 2 x 1cms  Weight  25 grams