function :  It performs a specific task, such as turning on a light or making an alert when an object obstructs the distance you specify for it

 function :  It acts as an operating switch that opens and closes

 function :  It is used in white, red, blue, and green lighting, and many colors can be obtained by adjusting the code for that

I will divide the explanation into parts:

First: All electronic components derive a voltage difference of 5 volts from the Arduino, but the Neopixel has three of them, and based on the three data sheets, it will need approximately 180 milliamps, while the Arduino does not pass more than 50 milliamps.

Solution: An external power source was used which were 7.4V lithium batteries with an adapter. The VIN input is connected to the battery and the 5V output is connected to Neopixels & VIN in Arduino is connected in direct with battery 

Second: How to connect the components to the Arduino

Ultrasonic sensor:

• Ground with Arduino ground or converter

• VCC with 5v in Arduino 

• echo output pin with pin 9 in Arduino 

• trig input pin with pin 10 in Arduino 

Touch Sensor :

• Ground pin with Ground pin in Arduino or converter 

• VCC with 5v in Arduino 

• Signal pin with pin 2 in Arduino 

Neopixels strip :

• Ground pin with Ground pin in Arduino or converter 

• VCC with 5v in Arduino 

• Input pin with pin 6 in Arduino 

💡Note : i connected 3 Neopixels in series ( input with output )

#include <Adafruit_NeoPixel.h>

#define PIN 6         // Pin connected to the Neopixels

#define NUMPIXELS 8 // Number of Neopixels in the strip

#define TRIG_PIN 9   // Pin connected to the ultrasonic sensor's trigger pin

#define ECHO_PIN 10  // Pin connected to the ultrasonic sensor's echo pin

#define TOUCH_PIN 2  // Pin connected to the touch sensor

#define DISTANCE_THRESHOLD 200  // Distance threshold in cm

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

void setup() {

  Serial.begin(9600);

  pixels.begin();

  pinMode(TRIG_PIN, OUTPUT);

  pinMode(ECHO_PIN, INPUT);

  pinMode(TOUCH_PIN, INPUT);

}

void loop() {

  long duration, distance;

  // Triggering ultrasonic sensor

  digitalWrite(TRIG_PIN, LOW);

  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);

  delayMicroseconds(10);

  digitalWrite(TRIG_PIN, LOW);

  // Measuring distance

  duration = pulseIn(ECHO_PIN, HIGH);

  distance = duration * 0.034 / 2;  // Calculate distance in cm

  if (distance <= DISTANCE_THRESHOLD) {

    // Turn on Neopixels

    pixels.fill(pixels.Color(255, 255, 255), 0, NUMPIXELS);  // White color

    pixels.show();

    // Check for touch sensor to turn off Neopixels

    while (digitalRead(TOUCH_PIN) == LOW) {

      // Wait until touch sensor is pressed

      delay(100);

    }

    // Turn off Neopixels

    pixels.clear();

    pixels.show();

  }

}

/*

 * Created by ArduinoGetStarted.com

 *

 * This example code is in the public domain

 *

 * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-neopixel-led-strip

 */

#include <Adafruit_NeoPixel.h>

#ifdef __AVR__

#include <avr/power.h>  // Required for 16 MHz Adafruit Trinket

#endif

#define PIN_NEO_PIXEL 4  // Arduino pin that connects to NeoPixel

#define NUM_PIXELS 30    // The number of LEDs (pixels) on NeoPixel

#define DELAY_INTERVAL 250  // 250ms pause between each pixel

Adafruit_NeoPixel NeoPixel(NUM_PIXELS, PIN_NEO_PIXEL, NEO_GRB + NEO_KHZ800);

void setup() {

  NeoPixel.begin();  // INITIALIZE NeoPixel strip object (REQUIRED)

}

void loop() {

  NeoPixel.clear();  // set all pixel colors to 'off'. It only takes effect if pixels.show() is called

  // turn pixels to white one by one with delay between each pixel

  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {           // for each pixel

    NeoPixel.setPixelColor(pixel, NeoPixel.Color(255, 255, 255));  // it only takes effect if pixels.show() is called

    NeoPixel.show();                                           // send the updated pixel colors to the NeoPixel hardware.

  }

  delay(2000);      // on time

  // turn off all pixels for two seconds

  NeoPixel.clear();

  NeoPixel.show();  // send the updated pixel colors to the NeoPixel hardware.

  delay(2000);      // off time

/*

 * Created by ArduinoGetStarted.com

 *

 * This example code is in the public domain

 *

 * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-touch-sensor-led

 */

const int TOUCH_SENSOR_PIN  = 2; // Arduino pin connected to the OUTPUT pin of touch sensor

const int LED_PIN           = 7; // Arduino pin connected to LED's pin

void setup() {

  Serial.begin(9600);               // initialize serial

  pinMode(TOUCH_SENSOR_PIN, INPUT); // set arduino pin to input mode

  pinMode(LED_PIN, OUTPUT);         // set arduino pin to output mode

}

void loop() {

  int touchState = digitalRead(TOUCH_SENSOR_PIN); // read new state

  if (touchState == HIGH) {

    Serial.println("The sensor is being touched");;

    digitalWrite(LED_PIN, HIGH); // turn on

  }

  else

  if (touchState == LOW) {

    Serial.println("The sensor is untouched");

    digitalWrite(LED_PIN, LOW);  // turn off

  }

}

I had it running previously at week 7, you should take a look