DFRobot ID809 MicroPython Driver

MicroPython driver for the DFRobot SEN0359 capacitive fingerprint sensor (ID809).

This is a direct port of the official DFRobot_ID809 C++ library to MicroPython.

Features

• Full I2C communication support
• Fingerprint enrollment (up to 80 fingerprints)
• Fingerprint verification and search
• LED control (colors and modes)
• Device configuration (security level, duplicate check, self-learning)
• Low power sleep mode
• Comprehensive error handling

Hardware

• Sensor: DFRobot SEN0359
• Capacitive Fingerprint Sensor: 80
• Interface: I2C (default address: 0x1F)
• Voltage: 3.3V / 5V compatible

Installation

From PyPI (recomendado)

pip install SEN0359

Con dependencias de desarrollo (para PC)

# Incluye stubs para autocompletado en IDE + herramientas de testing
pip install SEN0359[dev]

# Solo stubs para ESP32
pip install SEN0359[stubs-esp32]

# Solo stubs para Raspberry Pi Pico (RP2)
pip install SEN0359[stubs-rp2]

Manual Installation (MicroPython)

Copy the dfrobot_id809 folder to your MicroPython device's lib directory.

Nota: El módulo machine viene integrado en MicroPython y no necesita instalarse por separado.

Wiring

Quick Start

from machine import I2C, Pin
from dfrobot_id809 import DFRobot_ID809_I2C, LEDColor, LEDMode

# Initialize I2C
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=100000)

# Create sensor instance
sensor = DFRobot_ID809_I2C(i2c)

# Initialize sensor
if sensor.begin():
    print("Sensor initialized!")
    
    # Turn on green LED
    sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.GREEN)
    
    # Check connection
    if sensor.is_connected():
        print("Sensor connected!")
else:
    print("Sensor initialization failed!")

Usage Examples

Enroll a Fingerprint

from dfrobot_id809 import DFRobot_ID809_I2C, LEDColor, LEDMode, DELALL

def enroll_fingerprint(sensor):
    # Get first available ID
    empty_id = sensor.get_empty_id()
    if empty_id == 0:
        print("No space available!")
        return False
    
    print(f"Enrolling fingerprint at ID: {empty_id}")
    
    # Collect fingerprint 3 times
    for i in range(3):
        print(f"Place finger ({i+1}/3)...")
        sensor.ctrl_led(LEDMode.BREATHING, LEDColor.BLUE)
        
        # Wait for fingerprint
        if sensor.collection_fingerprint(timeout=10000) == 0:
            sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.GREEN)
            print("Captured!")
            
            # Wait for finger removal
            while sensor.detect_finger():
                pass
        else:
            sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.RED)
            print(f"Error: {sensor.get_error_description()}")
            return False
    
    # Store fingerprint
    if sensor.store_fingerprint(empty_id) == 0:
        print(f"Fingerprint stored at ID {empty_id}")
        sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.GREEN)
        return True
    else:
        print("Storage failed!")
        sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.RED)
        return False

Verify a Fingerprint

def verify_fingerprint(sensor):
    print("Place finger to verify...")
    sensor.ctrl_led(LEDMode.BREATHING, LEDColor.BLUE)
    
    # Capture fingerprint
    if sensor.collection_fingerprint(timeout=10000) == 0:
        # Search in database
        result = sensor.search()
        
        if result > 0:
            print(f"Match found! ID: {result}")
            sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.GREEN)
            return result
        else:
            print("No match found")
            sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.RED)
            return 0
    else:
        print(f"Capture error: {sensor.get_error_description()}")
        return -1

Delete Fingerprints

# Delete specific fingerprint
sensor.del_fingerprint(1)  # Delete ID 1

# Delete all fingerprints
sensor.del_fingerprint(DELALL)

LED Control

from dfrobot_id809 import LEDColor, LEDMode

# Solid colors
sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.GREEN)
sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.RED)
sensor.ctrl_led(LEDMode.KEEPS_ON, LEDColor.BLUE)

# Breathing effect
sensor.ctrl_led(LEDMode.BREATHING, LEDColor.CYAN)

# Blinking (5 times)
sensor.ctrl_led(LEDMode.FAST_BLINK, LEDColor.YELLOW, blink_count=5)

# Turn off
sensor.ctrl_led(LEDMode.NORMAL_CLOSE, LEDColor.GREEN)

Device Information

# Get device info
info = sensor.get_device_info()
print(f"Device info: {info}")

# Get enrolled count
count = sensor.get_enroll_count()
print(f"Enrolled fingerprints: {count}")

# Check if ID is registered
status = sensor.get_status_id(1)
print(f"ID 1 status: {'registered' if status else 'empty'}")

# Get security level (1-5)
level = sensor.get_security_level()
print(f"Security level: {level}")

API Reference

Classes

• DFRobot_ID809_I2C - Main sensor class for I2C communication
• LEDMode - LED mode constants
• LEDColor - LED color constants
• Error - Error code constants and descriptions

Main Methods

Error Codes

from dfrobot_id809 import Error

# Get error description
error_msg = Error.get_description(error_code)

License

MIT License - see LICENSE file.

Credits

• Original C++ library: DFRobot