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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

The SparkFun Pulse Oximeter and Heart Rate Sensor is an I²C based biometric sensor, utilizing two chips from Maxim Integrated: the MAX32664 Biometric Sensor Hub and the MAX30101 Pulse Oximetry and Heart Rate Module. While the latter does all the sensing, the former is an incredibly small and fast Cortex M4 processor that handles all of the algorithmic calculations, digital filtering, pressure/position compensation, advanced R-wave detection, and automatic gain control. We’ve provided a Qwiic connector to easily connect to the I²C data lines but you will also need to connect to two additional lines. This board is very small, measuring at 1in x 0.5in (25.4mm x 12.7mm), which means it will fit nicely on your finger without all the bulk.

The MAX30101 does all the sensing by utilizing its internal LEDs to bounce light off the arteries and arterioles in your finger’s subcutaneous layer and sensing how much light is absorbed with its photodetectors. This data is passed onto and analyzed by the MAX32664 which applies its algorithms to determine heart rate and blood oxygen saturation (SpO2). SpO2 results are reported as the percentage of hemoglobin that is saturated with oxygen. It also provides useful information such as the sensor’s confidence in its reporting as well as a handy finger detection data point. To get the most out of the sensor we’ve written an Arduino library to make it easy to adjust all the possible configurations.

Applications:

1.  Wearable Fitness
2.  Hearables
3. Wearable Medical
4.  Portable Medical
5.  Mobile Devices

Features:

1. Heart-Rate Monitor and Pulse Oximeter Sensor in LED Reflective Solution
2. Integrated Cover Glass for Optimal, Robust Performance
3. Biometric Sensor Hub Solution Enables Faster Time to Market

This  R503 DC12V Low Power Consumption Ring Fingerprint Access Control Board is an all-in-one control board with the onboard STM8 microcontroller. This module can act as a standalone system for the fingerprint access control system. The board comes with an onboard relay which is activated by the microcontroller when the fingerprint is detected. The activation time of the relay can be controlled via a multiturn potentiometer, which can be adjusted through 0.5 sec -13 sec.

How To Use:

1. After providing power to the module, the module will be in its initial factory mode where any fingerprint can activate the relay.
2. To register the fingerprint long press the SET  button for 3-4 sec, when the BLUE LED starts blinking it indicates that the module is ready to register the fingerprint.
3. Now place the finger which you want to register on the scanner and after the 5 beeps remove the finger. If you want to add other fingerprints then you can add or wait for some time till the LED stops blinking.
4. After the LED stops blinking you can use the registered fingerprint to activate the relay. When a registered fingerprint is read by the sensor the BLUE led will glow around the sensor and a RED/ORANGE led will glow if an unregistered fingerprint is detected.
5. The SET time of the relay can be adjusted by the multiturn potentiometer.

Features:

1. Low Power Consumption.
2. fingerprint store capacity

The DFRobot heart rate and oximeter sensor integrate the Maxim MAX30102 chip and an MCU with a heart rate and oximetry algorithm.

Features:

APPLICATIONS

Specifications:

Have your next project be controlled by your muscles with this pack of Muscle Sensor Surface EMG Electrodes! Pair the electrodes with the MyoWare Muscle Sensor and a microcontroller (ie. Arduino, or anything else with analog input reading ability) to create a DIY low-cost version of an EMG or an electromyograph!

This is for hobbyist use only.

Electromyography is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles. Use these sensors in prosthetics, robotics, and so much more!

The H124SG Covidien electrode type has a pre-gelled adhesive side with non-irritating gel, especially developed to prevent allergic reactions. The foam electrode is latex free and therefore suitable for every skin type.

The snap-on connector can easily be pushed on or removed from the electrode lead on the MyoWare. Therefore you have optimal user friendliness as you dispose this electrode after every session! No more greasy electrodes as the H124SG will cover the surface of the electrode. This also extends the life of your electrodes.

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.

This is an Ultrasonic Sensor, Transceiver, 16 mm Diameter, 40 kHz, -74 dB, Plastic, Black, -30 degree C to 85 degrees C product from MULTICOMP pro with the model number MCUSD16P40B12RO

Features:

1. Open structure and dual-use
2.  Compact and lightweight
3.  High sensitivity and sound pressure
4.  Less power consumption
5. High reliability

Specifications:

1. Construction: Open struct
2. Using Method: Dual Use
3. Frequency: 40 ± 1kKz
4. Transmitting Sound Pressure Level: min. 112dB (30cm/10V rms Sine Wave)
5. Receive Sensitive: min-74dB/V/ μbar
6. -6dB Directivity: 50°
7. Aftershock Time: max. 1.5ms
8. Sensitivity Distance: 0.6m to 16m
9. Capacitance: 3,000pF 20% at1kHz
10. Soldering conditions: 350°C to 400°C
11. Operating Temperature. Range: -30°C to 85°C
12. Allowable Input Voltage: 120Vp-p (40kHz)
13. Housing Material: Plastic

UNIT SONIC IO is a GPIO interface ultrasonic range sensor. This module features an RCWL-9620 ultrasonic distance measurement chip with a 16mm probe, which the ranging accuracy can reach 2cm-450cm (accuracy up to ±2%). This sensor determines the distance to a target by measuring time lapses between the transmitting and receiving of the pulse signal, users can directly obtain the distance value through IO control mode. It is ideal to apply in robotics obstacle avoidance, fluid level detection, and other applications that require you to perform measurements.

Features:

1. RCWL-9620
2. GPIO communication interface
3. Measuring range: 2cm-450cm
4. Protective housing
5. Built-in temperature compensation reduces the temperature drift
6. Support UIFlow platform

Specifications:

1. Ultrasonic Ranging Single Chip: RCWL-9620
2. Range: 2cm-450cm
3. Probe Specifications: 16mm
4. Receiving/Transmitting Frequency: 40KHz
5. Receiving sensitivity: -65dB
6. Pointing angle: 60°
7. Measurement accuracy: ±2%
8. Measurement period: 50ms
9. Working current: 3mA

Features of the MB1001, ParkSonar-EZ-72, include one-inch resolution, both proximity and range information for the nearest detectable target, and various output options: high/low logic level and RS232 serial.

The ParkSonar‑EZ line is designed to detect vehicles within a calibrated detection zone. The ParkSonar-EZ proximity sensors report when a vehicle, or other detectable target, enters the detection zone. The target is released after leaving the ParkSonar-EZ’s detection zone.

The MB1001 has a detection zone of ~6 feet. The MB1001 will allow for 14 simultaneous sensors depending on sensor mounting and environment.

Applications: 

1. Vehicle Detection Sensor
2. Parked car detection
3. Proximity zone detection
4. Sheltered drive thru’s
5. Non-condensing environments only
6. Designed for protected indoor environments
7. Other weather resistant models available2

Features: 

1. Automatic multi-sensor operation
2. RoHS Compliant
3. Small, light weight module
4. Designed for easy integration into your project or product
5. Mounting holes provided on the circuit board (or can be grommet mounted)
6. Very low power proximity sensor, excellent for multiple sensor or battery based systems
7. Continuously gives output which frees up user processors
8. User can choose either of the two sensor outputs
9. Runs automatically or can be triggered externally
10. Fast measurement cycle

Specifications: 

1. Operates voltage: 2.5 and 5.5V
2. Current: 2.0mA
3. Resolution: 1 inch
4. Target acquire time: ~10 second
5. Target release time: ~5 second
6. Maximum reported range: 254 inches (645 cm)
7. Choice of 2 digital outputs: Logic Level (High/Low) and RS232 serial
8. Ultrasonic sensor measures distance to objects: 42kHz
9. Virtually no sensor dead zone: objects closer than 6 inches typically range as 6 inches
10. Proximity Detection zone: 6 feet (72 inches)

Buy this powerful DC 24V Ultrasonic Humidifier device suitable for atomization with a plate diameter of 10 mm.  It is mostly in demand for fish pot and decoration purposes in households. It’s a simple plug-and-play module in which you just have to deep down the module in water and Supply 24 volt DC supply directly from the battery or power supply Adapter and it will start working.

Additionally, this 24v 12 Colourful LED Ultrasonic Humidifier 12 LED Mist Maker Fogger comes with 12 Waterproof LED with 3 different colours glowing alternately which adds the colourful mist to your decoration

The fully waterproof module has a 5mm DC female jack to connect the 24V input power supply with a 1-meter long cable.

Instruction to use:

1. Deep the module in the water keeping 4 to 5 cm water level above the device
2. Connect the power supply of 24V DC 1AMP and enjoy the fog.
3. Use power supply at least with 1AMP output for best performance
4. Do not deep it in water more than 5cm for maximum fog output.

How does it work?

Ultrasonic Humidifier Piezoelectric Transmitter module works on the principle of cavitation produced by sound waves. Just provide the power supply it will turn into an altimate ultrasonic atomizer.

Features:

1. Huge amount of humidification
   • High-frequency vibration produces 350ml of mist per minute, humidifying all-day
2. Wide Application
   • Supporting use bonsai crafts, fish tank water tanks, DIY crafts and ect.
3. Self-contained water level sensor
   • Automatically power off with water shortage to prevent burning of the atomizer

This is an Arduino compatible piezo film vibration sensor. It is made up of flexible piezo film and converter board. The sensor is able to detect vibration, flexibility, impact and touch. The film is a flexible component comprising a 28 µm thick piezoelectric PVDF polymer film with screen-printed Ag-ink electrodes, laminated to a 0.125 mm polyester substrate, and fitted with two crimped contacts. As the piezo film is displaced from the mechanical neutral axis and bending creates very high strain within the piezo polymer, high voltages (about ±90V) are generated. When the assembly is deflected by direct contact, the device acts as a flexible “switch”, and the generated output is sufficient to trigger MOSFET or CMOS stages directly.

The module uses universal Gravity 3Pin interface that is easy to plug and play. It comes with Digital and Analog two output signals, which is  suitable for all kinds of different applications. The piezo vibration sensor is not only able to detect strong shocks, but also to detect slight vibrations. There is an on-board sensitivity adjustment potentiometer, you can adjust it to increase/decrease the output threshold value.

Meanwhile, the piezo film sensor has a wide dynamic range (0.001Hz~1000MHz) also guarantees an excellent measuring.

Applications:

1. Vibration Sensing in Washing Machine.
2. Low Power Wakeup Switch.
3.  Low Cost Vibration Sensing.
4. Car Alarms.
5. Body Movement.
6. Security Systems.

Features:

1. Both No Mass & With Mass Version.
2. Withstands High Impact.
3. Operating Temperature: 0ºC to 85ºC.
4. Storage Temperature: -40ºC to 85 ºC.
5. Higher Temperature Version up to 125 ºC available on a Custom Basis.

Specification:

1. Operating Voltage: 5V.
2. Interface Type: Gravity PH2.0 3Pin interface.
3. Operating Temperature: 0 ° C to 85 ° C.
4. Storage Temperature: -40 ° C to 85 ° C.
5. Dimension: 27mm * 22mm.
6. Weight: 10 g.

Features :

• Red LED checks the state of the proximity sensor
• High repeated positioning accuracy
• High switching frequency
• Wide voltage range
• Outer (Thread) Diameter: M12
• Antivibration, dust, water and oil prevention
• Reverse power protection, short circuit protection, directly connecting with PLC
• Can replace small switches and limit switches

Package Includes :

1 x DC 6-36V M17 Inductive 1 – 10mm PNP-NO Proximity Sensor Switch
1 x DC 6-36V M17 Inductive 8mm NPN-NO Proximity Sensor Switch

Features :

• Red LED checks the state of the proximity sensor
• High repeated positioning accuracy
• High switching frequency
• Wide voltage range
• Outer (Thread) Diameter: M12
• Antivibration, dust, water and oil prevention
• Reverse power protection, short circuit protection, directly connecting with PLC
• Can replace small switches and limit switches

Package Includes :

1 x DC 6-36V M12 Inductive 4mm NPN-NO Proximity Sensor Switch
1 x DC 6-36V M12 Inductive 4mm PNP-NO Proximity Sensor Switch

Features:

1. With the controller can make various colours and change Blinking patterns,
2. Such as horse race, raindrop, color scan, trail and jump etc.
3. Flexible can be bent to any shape.
4. LED quantity and length can be made customizable
5. High brightness and long life (over 40,000hrs)
6. Low voltage, safe for use