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Unlocking Possibilities: Fingerprint Module Interfacing with Raspberry Pi

Updated: Mar 2

Do you know how the Biometric attendance system in your schools or colleges works? Nowadays, Just by placing a finger on the board one can access all the basic information about you. All these processes happen only because of the #fingerprint sensor. while going through this article, you can gain some knowledge about these sensors and the controlling unit which is nothing but #raspberrypi.

This interfacing is pretty simple and can be used as a reference for various projects in the future. We are going to learn about the entire process involved in this interfacing, starting from the list of required components.


The following list provides the hardware and software components required to perform this interfacing.

Table of contents :

Understanding the Fingerprint Module: Hardware Components and Setup:

1.Fingerprint Sensor - R307:

The number of fingerprints that can be stored is about 1000. The operating voltage of the R307 module is 3.3 V and there is a possibility of USB operation in it. The fingerprint detection output option is also available in the R307 sensor module. Here, we are using the #fingerprint sensor to capture our fingerprint and display the output with the help of #Raspberrypi.

· Normal working current: 50 mA

· Peak current: 80 mA

· Supply voltage: DC 4.2- 6.0 V

· Window area: 14x18 mm

· Matching method: Comparison method(1:1)

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Fingerprint Sensor

2.Raspberry Pi 3:

We are using Raspberry Pi to connect with the fingerprint module and display the output. It contains several I/O pins using which we can connect the module and then by coding the Raspberry Pi, we will receive the commands/signals that are sent from the fingerprint sensor.

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Raspberry Pi 3

You can also have a see the difference between Raspberry Pi 3 and Raspberry Pi 4 and can choose between Raspberry Pi 3 and Raspberry Pi 4 on the basis of that

Choosing the Right Raspberry


Raspberry Pi has become a popular choice for various projects due to its versatility and affordability. If you're wondering which model to pick between Raspberry Pi 3 and Raspberry Pi 4, this guide will help you make an informed decision.

Raspberry Pi 3:

- The Raspberry Pi 3 is the older but still capable model in the lineup.

- It features a 1.2GHz quad-core processor and 1GB of RAM, suitable for basic tasks and lightweight projects.

- Comes with built-in Wi-Fi and Bluetooth support.

- Ideal for retro gaming, media centers, and simple IoT projects.

Raspberry Pi 4:

- The Raspberry Pi 4 is the latest and more powerful version.

- It offers multiple configurations with 2GB, 4GB, or 8GB of RAM, making it suitable for more demanding applications.

- The 1.5GHz quad-core processor delivers a significant performance boost.

- Features dual micro-HDMI ports, Gigabit Ethernet, USB 3.0, and USB-C power supply.

- Perfect for advanced gaming, 4K video streaming, web servers, and more intensive projects.


If you're looking for an affordable and capable option for basic projects, the Raspberry Pi 3 is still a solid choice. However, if you need extra power and want to tackle more demanding tasks, the Raspberry Pi 4 is the way to go. Consider your project requirements and budget to choose the Raspberry Pi that best suits your needs.

3.CP2102 USB to TTL converter:

This module creates a virtual port on your computer using USB which can support various Baud rates for serial communication.

CP2102 USB to TTL converter:usb to ttl,cp2102 driver

4.Jumper wires:

These are simple connecting wires, that are used to connect the ends without any soldering. The male wires have the ends that can be connected to other ends and the female wires are the ones that have the receiving end. In this interfacing, female to female wires is used.

Jumper Wires
Jumper Wires

5.USB Cable:

This cable is used to connect the Raspberry Pi to the power supply. It also helps in the transmission of data.

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USB Cable

Software components:

1.SSH Terminal:

The SHH Terminal is used in this project to connect the Raspberry Pi module to the terminal of another computer.

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SSH Terminal

2.Python IDE:

#Python Programming is done in an IDE (Integrated Development Environment) is a platform where we can write the code, run, and test the working.

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Python IDE



The fingerprint sensor #R307 module is first interfaced with CP2 102 USB converter and then it is connected to the respective port of the raspberry pi device.

What goes where?

  • · RED wire connects the VCC pin of the fingerprint sensor to either 3.3 V pin or 5 V pin of the USB converter depending on the usage of either R305 or #R307 module.

  • · BLACK wire connects the ground pin of the sensor to the ground of the USB converter.

  • · BLUE wire connects the transmission pin[TX] of the sensor to the reception pin[RX] of the USB converter.

  • · YELLOW wire connects the reception pin[RX] of the sensor to the transmitting pin[TX] of the USB converter

Here, the DTR port of the CP2 102 USB converter is not involved in this interfacing.

After connecting the ports of the sensor and USB converter, the power supply is given. The raspberry pi device gets boot up.

DTR Port
DTR Port


1. Enroll Fingerprint

Note: This file is in the text format and should be converted to python-format (.py) before downloading.

Similarly, there are codes available for operations such as downloading the image of the fingerprint, searching the existing fingerprint, and deleting a fingerprint.

2. Deleting a fingerprint:

This code is used to delete a registered fingerprint from the fingerprint data stored previously.

Note: This file is in the text format and should be converted to python-format (.py) before downloading.

3. Search Fingerprint:

This code is used to search our fingerprint from the data which has been stored.

Note: This file is in the text format and should be converted to python-format (.py) before downloading.

4. Download Fingerprint Image:

This code is used to download the image of our fingerprint which has been captured by the sensor.

Note: The files above are in .txt format but should be converted into python file format (.py format) before uploading the code to Raspberry Pi.


Before executing the code, certain packages are needed to be installed to complete the interface.

Commands to install the required packages -

Open the SSH Terminal to install the packages and run the following commands:

Root privileges are required to run these commands. To enter the root use the command

sudo bash

Now, install the packages using the below command

wget –O – | apt-key add –
wget -P /etc/apt/sources.list.d/

To update your Raspberry Pi in the root itself use the with command

apt-get update

Install the fingerprint sensor library with

apt-get install python-fingerprint -yes

In case, you face any error while installing the package then type

apt-get -f install

Finally, after installing type "exit" to exit the root.

After executing any of the above-mentioned codes, the corresponding output is displayed in the raspberry pi terminal.

Output 1 - Enrolling Fingerprint

Output 1
Output 1

Output 2 - Searching Fingerprint

Output 2
Output 2

Output 3 - Deleting Fingerprint

Output 3
Output 3

Output 4 - Downloading Fingerprint Image

Output 4
Output 4

Fingerprint Image


Fingerprint sensors provide a convenient and secure way to access our devices. However, they may sometimes encounter issues. If your fingerprint sensor not working, follow these simple troubleshooting steps to resolve the problem.

Troubleshooting Guide: Fingerprint Sensor Not Working? Here's What to Do

  1. Clean the Sensor: Gently clean the sensor surface to remove dirt and oils that could affect its performance.

  2. Re-register Your Fingerprints: Delete existing fingerprint data and re-register your fingerprints to ensure accuracy.

  3. Check for Software Updates: Install the latest firmware or software updates to improve sensor functionality.

  4. Adjust Sensitivity: Experiment with sensitivity settings to find the optimal recognition accuracy.

  5. Restart Your Device: A simple restart can often fix temporary glitches.

  6. Inspect for Damage: Check for physical damage, as a damaged sensor may not work correctly.

  7. Disable Power-Saving Mode: Power-saving modes may affect the sensor's performance, so disable them if necessary.

Unlocking Security: Exploring Fingerprint Scanner Online Solutions:

In an increasingly digital world, security has taken center stage. Fingerprint scanner online solutions, empowered by advanced finger sensor technology, are paving the way for secure access and data protection. Let's delve into the realm of fingerprint sensor technology, its advantages, and how it influences fingerprint sensor prices.

The Evolution of Security: Finger Sensor Technology

Finger sensor technology is revolutionizing the way we secure our digital and physical spaces. As the need for enhanced security grows, fingerprint scanner online solutions are becoming essential. These systems leverage the unique patterns on an individual's fingertip to grant access, replacing traditional methods like PINs and passwords.

Exploring Fingerprint Scanner Online Solutions

The convenience of the online landscape has extended to security solutions, including fingerprint scanners. Online platforms now offer a diverse range of finger sensor devices tailored to various needs. From personal gadgets to enterprise-grade systems, fingerprint scanner online solutions cater to both individuals and businesses seeking robust security measures.

Advantages of Finger Sensor Technology

1. Impeccable Security: Fingerprints are like digital signatures, unique to each individual. This makes unauthorized access extremely challenging, bolstering security significantly.

2. Effortless Access: With finger sensor technology, gaining access becomes seamless. No more remembering complex passwords or carrying keys – a simple touch suffices.

3.Versatile Applications: Finger sensor technology transcends personal devices. It's widely employed in workplaces for attendance tracking, access control, and time management.

Understanding Fingerprint Sensor Prices

Fingerprint sensor prices can vary due to factors like features, brand, and intended use. As technology advances, entry-level fingerprint scanner online options have become more affordable. These devices offer basic yet effective security. Meanwhile, higher-end finger sensor systems, equipped with advanced features, are available at a premium.

Factors Influencing Fingerprint Sensor Prices

1.Accuracy and Speed: High-performance fingerprint sensors with rapid recognition capabilities often command a higher price due to their advanced technology.

2.Brand Reputation: Established brands with a history of reliable security solutions may have fingerprint sensor prices that reflect their reputation and quality.

3.Additional Features: Some finger sensor models offer extra features like waterproofing, tamper resistance, and connectivity options, contributing to variations in prices.

Finding the Right Balance: Security and Price

When considering fingerprint scanner online options, striking the right balance between security and price is crucial. An assessment of your security needs, coupled with a budgetary evaluation, will guide your decision-making. Remember that the investment in finger sensor technology pays off through enhanced security, convenience, and peace of mind.

Embracing the Future with Fingerprint Scanner Online Solutions

Fingerprint scanner online solutions represent the future of security. As technology continues to evolve, finger sensor devices become more accessible and capable. Whether you're safeguarding personal devices, securing your workplace, or enhancing organizational security, finger sensor technology offers a robust solution that marries convenience and protection.

In the dynamic landscape of security solutions, fingerprint scanner online choices empower individuals and businesses to take control of their safety. With its irreplaceable advantages and varying fingerprint sensor prices, this technology unlocks a new era of security for the modern world.


With these troubleshooting tips, you can often fix issues with your fingerprint sensor and enjoy its seamless functionality again. Remember to keep the sensor clean and stay updated with software improvements. If the problem persists, seek support from the manufacturer or a professional.

Learn Electronics. (June 20, 2020). Interfacing fingerprint sensor with Raspberry Pi.

The day-to-day applications of fingerprint sensors include mobile lock, security systems, and biometric attendance at schools and colleges and this interfacing is the base of all those. In this interfacing, Python language is used, so the beginners can also perform the interfacing operations quite easily.

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Daipayan Maitra
Daipayan Maitra
Aug 10, 2023

Great guide on interfacing a fingerprint sensor with Raspberry Pi! I had some trouble with my fingerprint sensor not working, but your explanations for both Raspberry Pi 4 and Raspberry Pi 3 were really helpful. Thanks for sharing this!


Impressive work on the blog post about Integrating Fingerprint Sensor with Raspberry Pi. Your expertise shines through in your explanations. I'm eager to learn more about advanced features and potential use cases of the fingerprint module. Your insights are highly valued!


Anushka Gupta
Anushka Gupta
Aug 01, 2023

Learn Electronics India has nailed it with this blog! I was a bit intimidated by the idea of integrating a fingerprint sensor with my Raspberry Pi, but the blog's simplicity and clear instructions made the entire process enjoyable. I'm looking forward to exploring more of your content.


Informative and concise! LearnElectronics India always delivers quality content.

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