Same library implementation in Micropython: https://github.com/rshcs/r503_uPython

• Written in pure python.
• Provides all the manufacturer specified operations of the module.
• Can be connected with a computer directly with a USB to TTL converter. (Do not need a microcontroller)
• Can be used for testing the functionality of the module or creating direct applications without involving a microcontroller.

(Ref: Datasheet)

• Make sure to use 3.3v power supply unless you have the 5v version of the sensor.

• If you use a separate 3.3v power supply other than the RS232 converters power then make sure to connect grounds together (common ground).

• The line order is according to the colors, even though the note says it's not.

• This module can be used to interface with the module since it provides 5v to 3.3v conversion for both logic level and power.
• However, make sure to switch jumper position to the 3.3v and connect 3.3v power pin of the converter.

Method 1:

• Run pip install r503 on terminal

Method 2:

• Run pip install pyserial on terminal.
• Download r503.py file.
• Download confirmation_codes.json file.
• Place downloaded files in the project directory

from r503 import R503

fp = R503(port=5)
fp.manual_enroll(location=8)

• you have to place the finger 4 (changeable) times on the sensor during the process

Terminal output:

from r503 import R503
from time import sleep

fp = R503(port=5)

print('Place your finger on the sensor..')
sleep(3) # Not required to add this line
print(fp.search())

Terminal output:

• first value = success if 0
• second value = stored location of the memory
• third value = match score

from r503 import R503

fp = R503(port=5)
print('Num of templates: ', fp.read_valid_template_num())

Terminal output:

from r503 import R503

fp = R503(port=5)
print(fp.read_index_table())

Terminal output:

from r503 import R503

fp = R503(port=5)
fp.delete_char(6)

Deletes the fingerprint record at given index

from r503 import R503

fp = R503(port=5)
fp.led_control(ctrl=3, color=5)

Output: LED keeps on with a specific color according to the number

from r503 import R503

fp = R503(port=5)

for k, v in fp.read_prod_info_decode().items():
    print(k, ': ', v)

Terminal output:

For Linux users: if a permission error occurs while opening the serial port, run the following command:

sudo chmod a+rw /dev/ttyUSB{your device port number}

Etc:

sudo chmod a+rw /dev/ttyUSB0

References:

• pypi.org/r503
• grow-r503-docs.readthedocs.io