Introduction
Security is the one thing that needs a permanent solution. Either the security of your home, offices, the industry where you work, or the devices, or gadgets you use daily. Thus, to address those security issues, there are different sensors available. These sensors include the optical scanner, the ultrasonic scanner, the thermal sensor, and the capacitive sensor. Thus this article is about the capacitive sensor. Here we are going to discuss an overview, features, and applications of Round Fingerprint capacitive Sensors.
The fingerprint sensor module is used to verify identity. We widely used it for door locks, computers, cell phones, access control systems, security safes, etc
Hardware Overview of
There’s a powerful DSP chip that does the computation, feature finding, searching, etc. We can easily interface the sensor with any microcontroller with TTL, and send packets of data or information to recognize prints, hash, and search. You can likewise register new fingers straightforwardly. Up to 80 fingerprints can be kept stored in the board FLASH memory.
Features and Specification of Capacitive Fingerprint Sensor
Features
- Easy to use by some simple commands, you don’t have to know any fingerprint technology or the module inter structure
- The commercial fingerprinting algorithm has stable performance, and fast verification, and supports fingerprint enrolling, fingerprint matching, collecting fingerprint images, and upload fingerprint features, etc.
- Capacitive sensitive detection, just touch the collecting window lightly for fast verification
- Hardware highly integrated, processor and sensor in one small chip, suited for small-size applications
- Narrow stainless steel rim, large touching area, supports 360° Omni-directional verification
- Embedded human sensor, the processor will enter sleep automatically, and wake up when touching, lower power consumption
- Onboard UART connector, easy to connect with hardware platforms like Arduino and Raspberry Pi
Specifications
- Operating Voltage: 3.3V
- Operating Current: less than 60mA
- Communication Method: UART
- Storage Capacity: 80 fingerprints
- 1:1 verification time: 300~400ms
- Pixel Resolution: 508dpi
- Number of Pixels: 160×160
- Fingerprint Detection Area: 8.0mm x 8.0mm
- Working Environment: ‐40‐60℃/ less than RH 90%
- Dimension: diameter 21mm/height 5mm
R503 Pinouts
| Num | Label | Description |
|---|---|---|
| 1 | GND | Ground |
| 2 | RX | UART receive |
| 3 | TX | UART transmit |
| 4 | VIN | Power supply (3.3V): connect to work, disconnect to enter sleep |
| 5 | IRQ | Finger sensing output： active high |
| 6 | 3.3V | Power Supply |
Applications
Fingerprint lock
With the help of a microcontroller and this module, we can utilize this in different fingerprint door lock systems for various places and devices.
Access Control System
One can control different appliances using this sensor. And, for this, we don’t have to provide force to press a button like the regular switch. This may be the reason that ouch sensing technology is growing day by day.
Electronic Gadgets and Devices
We can use them in electronic devices like laptops and cell phones for security purposes.
