Add APA102 and DEFAULT_I2C_BUS definitions to the lilygo_tdongle_s3

[freemansoft]

Change for the LILYGO T-Dongle-S3 pen drive board https://lilygo.cc/en-us/products/t-dongle-s3

• This change should enable board.STEMMA_I2C and the APA102 status lights.
• I intend to test this against the build artifacts that I hope are created from this pull request
• This issue is discussed in https://forums.adafruit.com/viewtopic.php?p=1077490

[freemansoft]

This PR was tested

1. Download the build artifact
2. Flashed to my LILYGO T-Dongle S3
3. Verified the status lights per https://learn.adafruit.com/welcome-to-circuitpython/troubleshooting
4. Ran the following program to verify board.STEMMA_I2C() now functions

import time

import adafruit_vl6180x
import board
import busio

# print(dir(board))

# T-Dongle display
display = board.DISPLAY
# disables the repl on the display for our own use
# display.root_group = None

# Fails on T-Dongle with -> NotImplementedError: No default I2C bus
# This code succeeds with PR https://github.com/adafruit/circuitpython/pull/10773
i2c = board.STEMMA_I2C()
# i2c = busio.I2C(board.STEMMA_SCL, board.STEMMA_SDA)

# manually grab a lock before scanning brought in by ai copilot
while not i2c.try_lock():
    time.sleep(0.5)
# 2. (Optional but recommended) Scan for devices to get addresses
print("Scanning for I2C devices...")
# Get the addresses found on the STEMMA bus
addresses = [hex(addr) for addr in i2c.scan()]
print(f"I2C addresses found on STEMMA bus: {addresses}")
i2c.unlock()

# We don't need to manage locking when using adafruit_bus_device.I2CDevice
print("VL6180X opening device...")
sensor = adafruit_vl6180x.VL6180X(i2c, offset=0)
print("VL6180X found {}".format(sensor))

# You can add an offset to distance measurements here (e.g. calibration)
# Swapping for the following would add a +10 millimeter offset to measurements:
# sensor = adafruit_vl6180x.VL6180X(i2c, offset=10)

# Main loop prints the range and lux every second:
while True:
    # Read the range in millimeters and print it.
    range_mm = sensor.range
    print(f"Range: {range_mm}mm")
    # Read the light, note this requires specifying a gain value:
    # - adafruit_vl6180x.ALS_GAIN_1 = 1x
    # - adafruit_vl6180x.ALS_GAIN_1_25 = 1.25x
    # - adafruit_vl6180x.ALS_GAIN_1_67 = 1.67x
    # - adafruit_vl6180x.ALS_GAIN_2_5 = 2.5x
    # - adafruit_vl6180x.ALS_GAIN_5 = 5x
    # - adafruit_vl6180x.ALS_GAIN_10 = 10x
    # - adafruit_vl6180x.ALS_GAIN_20 = 20x
    # - adafruit_vl6180x.ALS_GAIN_40 = 40x
    light_lux = sensor.read_lux(adafruit_vl6180x.ALS_GAIN_1)
    print(f"Light (1x gain): {light_lux}lux")
    # Delay for a second.
    time.sleep(1.0)

boot_out.txt

Adafruit CircuitPython 10.0.3-4-gc9465b3454 on 2026-01-06; LILYGO T-Dongle S3 with ESP32S3
Board ID:lilygo_tdongle_s3

[dhalbert]

This looks fine. Thanks very much for fixing the board definition.