Embedded LED

Introduction

With this project we will manage a LED, using the FTDI FT232H development board (of which there is a dedicated page on this site) and the NXP PCA9685 development board (of which there is a dedicated page on this site).

Connection

This LED must be connected to the NXP PCA9685 development board. The connection connectors are listed below:

Python code

To manage this LED, the presence of the "PCA9685_FTDI" library is required.
The following Python code example turns the LED on/off and then creates a color flow:

import time
import pca9685_ftdi

# Create library object using our FTDI I2C port
pwm = pca9685_ftdi.PCA9685_FTDI()

STEP      = 2
FACTOR    = 4
SLEEP     = 0
CHANNEL   = 0

try:
    while True:
        print("\nLED on")
        pwm.setPWM(CHANNEL, 0, 256 * FACTOR)
        time.sleep(5)

        print("LED off")
        pwm.setPWM(CHANNEL, 0, 0)
        time.sleep(5)

        print("\nLED Flow")
        for fadeValue in range(0, 256, STEP):
            pwm.setPWM(CHANNEL, 0, fadeValue * FACTOR)
            time.sleep(SLEEP)

        print("LED Flow - Reverse")
        for fadeValue in range(255, -STEP, -STEP):
            pwm.setPWM(CHANNEL, 0, fadeValue * FACTOR)
            time.sleep(SLEEP)

        time.sleep(2)

except KeyboardInterrupt:
    # Capture keyboard ^C to exit the program
    print('\nYou terminated the program. The program ends!')
    #pwm.clearAllPins()
    pwm.set_all_pwm(0, 0)
    pwm.close()