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The Digital LDR Module is used to detect the presence of light / measuring the intensity of light. The output of the module goes high in the presence of light and it becomes low in the absence of light. The sensitivity of signal detection can be adjusted using the potentiometer.

Use it to detect the light brightness in your environment and decide to switch OFF or ON light? Or maybe to adjust the brightness of the LED of your house?

You can adjust the threshold (sensitivity) of the digital output by tuning the onboard variable resistor (potentiometer). Simple usage as it is the digital output, so you will know is the light present and decide what to do with it.

It comes with an M3 mounting hole for ease of attaching it to an object. Onboard, it provides an LDR, high sensitivity and commonly being used for light detection. The module comes with a power LED and a status LED as an indicator.

LDR Module Photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.

How it Works :

1. Module light conditions or light intensity reach the set threshold, DO port output high when the external ambient light intensity exceeds a set threshold, the module D0 output low;
2. Digital output D0 directly connected to the MCU, and detect high or low TTL, thereby detecting ambient light intensity changes;
3. Digital output module DO  can directly drive the relay module, which can be composed of a photoelectric switch.

Pin Details :

VCC ↔ 3.3V to 5V DC.
GND ↔ Ground.
DO ↔ Digital Output.

• LM393 based design.
• It can detect ambient brightness and light intensity.
• Adjustable sensitivity (via blue digital potentiometer adjustment).
• Output Digital – 0V to 5V, Adjustable trigger level from preset.
• LEDs indicating output and power.

• 1 x Digital LDR Module

This LM393 Photosensitive Light-Dependent Control Sensor LDR Module is using a high-quality LM393 voltage comparator. Easy to install using the sensitive type photosensitive resistance sensor the comparator output signal gives a clean and good waveform.

Driving ability is 15mA with the adjustable potentiometer, it can adjust the brightness of the light. Working voltage is 3. 3V to 5v. Where output is a digital switch output. Since this module is sensitive to the light, usually used for detecting the ambient brightness and light intensity.

You can use this board digital output DO port drive relay module directly(our store on sale these relay modules), and can also use as a photoelectric switch. The analog output ao connects with ad module and it can get more precise light intensity value through the ad-converter.

Interface Pin :

• VCC: Positive power supply
• GND: Ground
• D0: Digital output signal
• A0: Analog Output Signal

• It comes with Mounting Hole Screw
• Easy to install
• Signal output indicator light.
• LDR module 4 PIN
• Able to detect ambient brightness and light intensity Adjustable sensitivity (via blue digital potentiometer adjustment)
• Output: DO digital switch output (0 and 1), AO analog voltage output Compatible with Arduino, Raspberry, and other microcontroller board

• 1 x LM393 Photosensitive Light-Dependent Control Sensor LDR Module

A sound sensor is defined as a module that detects sound waves through their intensity and converts it to electrical signals.

The sound detection sensor module for Arduino detects whether the sound has exceeded a threshold value. Sound is detected via microphone and fed into an LM393 op-amp. The sound level set point is adjusted via an onboard potentiometer. When the sound level exceeds the set point, an LED on the module is illuminated and the output is sent low.

Specifications :

• Operating voltage 3.3V-5V
• Outputs digital switching output (high and low levels 0 and 1
• Operating current (Vcc=5V): 4-8mA
• Microphone sensitivity (1Khz): 52-48dB
• Microphone Impedance: 2.2KΩ
• Microphone Frequency: 16-20Khz
• Microphone S/N ratio: 54dB
• Signal output indication
• Single channel signal output
• Outputs low level and the signal light when there is sound

• 1 x Sound Detection Sensor Module

This is an Analog Sound Sensor Microphone Module for Arduino. Some Applications like interactive voice switch and loudness level indicator is very suited for this module.

• Detectable sound signal size
• Built-in filter-rectifier circuit, DC signal output
• Good sensitivity, built-in amplifier circuit, adjustable gain
• Voltage signal for sound intensity can be obtained by AD conversion
• Analog voltage signal output, signal amplitude VCC/2
• Compatible for Arduino sensor interface

• 1 x Analog Sound Sensor Microphone Module for Arduino

This is a Sound Sensor Microphone Module. Some Applications like interactive voice switch and loudness level indicator is very suited for this module.

• There is a mounting screw hole 3mm
• 5v DC power supply
• With analog output
• There are threshold level output flip
• Power indicator light
• The comparator output is light
• High Sensitivity Sound Microphone Sensor Detection Module
• Electric condenser microphone
• Low-level output signal used for sound control light

• 1 x Analog Sound Sensor Microphone Module for Arduino

Sound Detection Module Sensor for Intelligent Vehicle Compatible With Arduino is a Single channel signal output Sensor. The output is effective to the low-level sound signal with good fidelity, When there is sound, outputs low level and signal light.

It can be used for Acoustic control light, give sound and light alarm working with the Photosensitive sensor, and sound control, sound detect. (The Maximum induction distance is 0.5M)

Note: This sensor only recognizes the availability of sound (vibration principle) cannot identify the size of the sound or the specific frequencies of sound.

• Uses LM393, Electret condenser microphone
• Signal output Indication
• Single channel signal output
• The output effective signal is low level
• Can detect the intensity of the sound environment
• With the retaining bolt hole, convenient installation

• 1 x Sound Detection Module Sensor

LM393 Sound Detection Sensor Module for Arduino detects whether the sound has exceeded a threshold value. The sound is detected via a microphone and fed into an LM393 op-amp.

The sound level setpoint is set via an onboard potentiometer. When the sound level exceeds the setpoint, an LED on the module is illuminated and the output is sent low.

Note: This sensor only recognizes the availability of sound (vibration principle) cannot identify the size of the sound or the specific frequencies of sound.

• Signal output indication
• The output is digital
• Single-channel signal output
• With the retaining bolt hole, convenient installation
• Output low level and the signal light when there is sound

• 1 x LM393 Sound Detection Sensor Module

Magic Light Cup Module is a board which has a led and a mercury tilt switch. Using PWM to drive the LEDs on the module you can achieve the effect of light being “magically” transferred from one module to the other when tilting them. In short, it’s 2 components combined, a mercury tilt switch and a led. On tilting the module mercury inside small tube connect the switching point and make switch ON while tilting it to other side move the mercury and it disconnects the circuit and switch get OFF. The module operates on 5V DC supply.

So the magic in the name of this module is because when you tilt the switch, the led will turn on and off. And Of course, it is also possible to connect it to the NodeMCU.

Pin Connection with Arduino : 

• G: GND
• Positive: 5v DC
• S: Arduino pin 8
• L: Arduino pin 9

Pin Connection with Node MCU : 

• Connect G to a GND port of your NodeMCU
• Connect to a 3.3v port of your NodeMCU
• Connect S to a digital port on your NodeMCU (in my example port D3)
• Connect L to a digital port on your NodeMCU (in my example port D5)

• 1 x Magic Cup Light Module

Speak (Voice) Recognition Module V3 compatible with Arduino is a compact and easy-control speaking recognition board.

Speak (Voice) Recognition Module V3 product is a speaker-dependent voice recognition module. It supports up to 80 voice commands in all. Max 7 voice commands could work at the same time. Any sound could be trained as the command. Users need to train the module first before let it recognizing any voice command.

This board has 2 controlling ways: Serial Port (full function), General Input Pins (part of a function). General Output Pins on the board could generate several kinds of waves while the corresponding voice command was recognized.

What are the updated features?

We have Voice Recognition module V2 and it supports 15 commands in all and only 5 commands at the same time. On V2, voice commands are separated into 3 groups while you training it. And only one group (5 commands) could be imported into Recognizer. It means only 5 voice commands are effective at the same time.

On V3, voice commands are stored in one large group like a library. Any 7 voice commands in the library could be imported into recognizer. It means 7 commands are effective at the same time. 

• Support a maximum of 80 voice commands, with each voice 1500ms (one or two words speaking)
• Maximum 7 voice commands effectively at the same time
• Arduino library is supplied
• User-control General Pin Output
• Analog Interface: 3.5 mm mono-channel microphone connector  microphone pin interface

• 1 x Voice Recognition Module V3
• 1 x Microphone

The GY-273 module is based on the Honeywell QMC5883L IC for low-field magnetic sensing with a digital interface for applications such as low cost compassing and magnetometry. The QMC5883L includes state-of-threat, high-resolution QMC118X series magneto-resistive sensors plus an ASIC containing amplification; automatic degaussing strap drivers, offset cancellation, and a 12-bit ADC that enables 1° to 2° compass heading accuracy. The I2C serial bus allows for an easy interface.

The QMC5883L utilizes Honeywell’s Anisotropic Magnetoresistive (AMR)technology that provides advantages over other magnetic sensor technologies. These anisotropic, directional sensors feature precision in-axis sensitivity and linearity.

These sensors’ solid-state construction with very low cross-axis sensitivity is designed to measure both the direction and the magnitude of Earth’s magnetic fields, from milli-gauss to 8 gausses. Honeywell’s Magnetic Sensors are among the most sensitive and reliable low-field sensors in the industry.

Note: Sometimes markings on these boards vary slightly (e.g. Some may be labeled ‘HW-127’ instead of ‘GY-273’ even though they are otherwise identical).

Applications :

• Auto and personal navigation
• UAV systems
• Robotic navigation
• Location-based services (LBS)

• 1-2 degree heading accuracy
• A range of -8 to 8 Gauss
• Communication: IIC communication protocol

• 1 x GY-273 QMC5883L 3 Axis Module Magnetic Field Sensor

The ADXL335 is a small, thin, low-power, complete 3-axis accelerometer with signal conditioned voltage outputs. The ADXL335 Module 3-axis Analog Output Accelerometer measures acceleration with a minimum full-scale range of ±3 g.

It can measure the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. This breakout board comes with an onboard voltage regulator and works at both 3.3V & 5V (3-5V).

An accelerometer is an electro-mechanical device that will measure acceleration forces. These forces may be static, like the constant force of gravity pulling at your feet, or they could be dynamic – caused by moving or vibrating the accelerometer.

Applications :

• FPV, RC, and Robots systems
• GPS navigation systems
• Impact recognition and logging
• Gaming and virtual reality input devices
• Motion-activated functions
• Intelligent power saving for handheld devices
• Vibration monitoring and compensation
• Free-fall detection
• 6D-orientation detection

• Onboard LDO Voltage regulator
• Can be interfaced with a 3V3 or 5V Microcontroller.
• All necessary Components are populated.
• Ultra-Low Power: 40uA in measurement mode, 0.1uA in standby@ 2.5V
• Tap/Double Tap Detection
• Free-Fall Detection
• Analog output
• Build-in ultra-low noise linear LDO voltage regulator
• Built-in onboard filters, which reduce noise from the motor and other high current electronics
• Power LED
• Designed for 5V logic level

• 1 x ADXL335  3-axis Analog Output Accelerometer Module angular transducer

This looks like a potentiometer, but it’s an encoder switch.

It is a cascadable 360 ° rotary encoder switch with 20 pulses per revolution, and each pulse corresponds to a detent. There are LED lights set for each detent to allow users visually check the real-time status of the encoder.

For ease of use, the module is designed with I2C data output and configurable accuracy within 1~51 for every detent (set in the program). For instance, when it is set to 1, turn on one LED light by rotating 2.5 revolutions; when set to 51, then one LED light can be switched on by rotating one detent.

In order to apply to more scenarios, the encoder is equipped with a cascade function that enables to control of multiple output devices by occupying only one I2C interface, such as, simultaneously controlling light brightness, color, volume, speed, etc.

If you are wandering to make a machine which is used to detect heart rate and pulse rate. then this sensor Module is Compatible with you.

Heart Rate click carries Maxim’s MAX30100 integrated pulse oximetry and a heart-rate sensor. It’s an optical sensor that derives its readings from emitting two wavelengths of light from two LEDs – a red and an infrared one – then measuring the absorbance of pulsing blood through a photodetector. This particular LED color combination is optimized for reading the data through the tip of one’s finger.

The signal is processed by a low-noise analog signal processing unit and communicated to the target MCU through the mikroBUS I2C interface. Developers of end-user applications should note that the readings can be negatively impacted by excess motion and changes in temperature. Also, too much pressure can constrict capillary blood flow and therefore diminish the reliability of the data. A programmable INT pin is also available. The operates at the 3.3V power supply.

Main Applications:

1. Medical Monitoring Devices
2. Fitness Assistant Devices
3. Wearable Devices

Pin Configuration:

Circuit Diagram:

Specifications and Features:

1. Optical sensor: IR and red LED combined with a photodetector
2. Measures absorbance of pulsing blood
3. I2C interface plus INT pin
4. 3.3V power supply complete pulse oximeter and heart rate sensor solution, simplifies design, integrated LEDs, photo sensor, and
5. high-performance analog front
6. Ultra low power operation increases battery life for wearable devices
7. Advanced functionality improves measurement performance, high SNR provides robust motion artifact resilience integrated
8. ambient, light cancellation high sample rate capability fast data output capability
9. It is an integrated pulse oximetry and heart rate monitor sensor solution.

his KY-039 Finger Detection Heartbeat Measuring Sensor Module uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse.

The LED is the light side of the finger, and the phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted, when the blood pressure pulse by the finger when the resistance of the phototransistor will be slightly changed.

We chose a very high resistance resistor R1 because most of the light through the finger is absorbed, it is desirable that the phototransistor is sensitive enough. Resistance can be selected by experiment to get the best results. The most important is to keep the shield stray light into the phototransistor.

For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.

Example Code:

// Pulse Monitor Test Script
int sensorPin = 0;
double alpha = 0.75;
int period = 100;
double change = 0.0;
double minval = 0.0;
void setup ()
{
Serial.begin (9600);
}
void loop ()
{
static double oldValue = 0;
static double oldChange = 0;

int rawValue = analogRead (sensorPin);
double value = alpha * oldValue (1 – alpha) * rawValue;

Serial.print (rawValue);
Serial.print (“,”);
Serial.println (value);
oldValue = value;

delay (period);
}

Features :

1. Use IR LED and an optical transistor to detect pulsation in fingers
2. Small and Compact module
3. Easy to use.

The GT511C3 Optical Fingerprint Scanner Module with JST SH Connector is a high-performance fingerprint scanner. Which is useful for to access control, security, identification, and convenience. This optical sensor module is designed for easy integration into applications with serial interface (UART). We need two wires are for TX and RX and two wires for power supply (5V).

The main difference between GT511C3 and GT521F52 is fingerprint storage capacity.

The Difference between GT511C3 and GT521F32 is :

There are four types of fingerprint scanner: the optical scanner, the capacitance scanner, the ultrasonic scanner, and the thermal scanner. The GT511C3 Fingerprint Scanner Module is an optical scanner module. This optical scanner takes a visual image using a digital camera.

The pictures of the fingerprints are processed onboard by the fingerprint algorithm (low power 32-bit ARM Cortex-M3 processor) and convert it into strings of data. These so-called ‘templates’ are residing on the module configured as a USB mass storage device. They can store and share through a database with other modules in a network, allowing easy enrollment of many users.

The Ecg module AD8232 heart ECG monitoring sensor module Kit For Arduino is a cost-effective board use to measure the electrical activity of the heart. This electrical activity can be chart as an ECG or Electrocardiogram and output as an analog reading.

ECGs can be extremely noisy, the AD8232 Single Lead Heart Rate Monitor acts as an op-amp to help obtain a clear signal from the PR and QT Intervals easily. The ECG module AD8232 heart ECG monitoring sensor module is an integrated signal conditioning block for ECG and other bio-potential measurement applications.

The ECG Module AD8232 Heart ECG Monitoring Sensor Module Kit for Arduino is designed to extract, amplify, and filter small bio-potential signals in the presence of noisy conditions; such as those created by motion or remote electrode placement.

The AD8232 Heart Rate Monitor breaks out nine connections from the IC that you can solder pins, wires, or other connectors too. SDN, LO , LO-, OUTPUT, 3.3V, GND provide essential pins for operating this monitor with an Arduino or other development board.

The fingerprint algorithm extracts features from the acquired fingerprint image and represents the fingerprint information. The storage, comparison, and search of fingerprints are all done by operating fingerprint features.
Fingerprint processing includes two processes: fingerprint registration process and fingerprint matching process (in which fingerprint matching is divided into fingerprint comparison (1:1) and fingerprint search (1:N) two ways).

When the fingerprint is registered, two fingerprints are entered for each fingerprint, and the input image is processed twice. The synthesis module is stored in the module.
When the fingerprint is matched, the fingerprint sensor is used to input the fingerprint image to be verified and processed, and then it is compared with the fingerprint module in the module (if it is matched with a module specified in the module, it is called fingerprint comparison mode, ie, 1:1 mode. If matching with multiple modules is called fingerprint search, ie 1:N mode, the module gives the matching result (pass or fail).

This is a small 1D/2D codes reader, by using the intelligent image recognition algorithm, it will decode the barcode or 2D code on paper or screen, fast and accurately.

Through the onboard USB and UART interface, it can be directly plugged into a computer, or be easily integrated to kinds of devices due to its small form factor.

Features: 

1. Easy to use, requires no knowledges of image recognition
2. Decodes various common 1D/2D codes such as Barcode, QR code etc.
3. Onboard micro USB and UART serial port, allows to connect with computers or embedded devices
4. Configurable via scanning ‘configuration code’
5. Onboard light source, works in the dark

Most Waterproof Ultrasonic Sensor Module aren’t waterproof which can be a problem if you need your project to withstand the elements outdoors. No need to worry anymore! We have developed waterproof & ultrasonic distance sensors with a waterproof sealed emitter. This sensor is suitable for outdoor applications such as car reversing sensors, security alarms, industrial inspection, etc.

This module is easy to use. A control port sends a high level above 10US, so you can wait for the high-level output at the receiving port. You can turn on the timer when there is an output. When this port goes low, you can read it. The value of the timer, at this time, is the time of the distance measurement, in order to calculate the distance. Such continuous cycle measurement, that is, you can reach the value of your mobile measurement.

1. Horizontal ranging.
2. Obstacle avoidance, automatic control.
3. Objects are close, there is awareness.
4. Traffic control.
5. Security, industrial control.
6. Artificial intelligence, teaching, and research.

Features:

1. Small size and easy to use.
2. Low voltage and low power consumption.
3. High measurement accuracy.
4. Strong anti-interference.
5. Integrated enclosed waterproof line probe for wet and harsh measurement applications.