Hi everyone,

Currently building a circuit that controls a single colour LED strip with a MOSFET. Built the circuit in tinkercad, and everything was working fine, but now when I'm making the actual circuit in real life, everything except for the LED turning on is working. I was hoping to get some help.

The circuit involves turning a potentiometer to set a timer, using a slider switch to set brightness, and then pressing the button to turn on the light for a specified amount of time. The LCD displays this information.

Uploaded the circuit diagram below; in place of the 9V battery is a 12V 2A power supply, and the LED is replaced with a single-colour blue LED strip. The LED strip turns on just fine when connected directly to the 12V supply. The code is down below.

Edit: link to mosfet

Thanks in advance for any help!

https://preview.redd.it/b990qlkwk9qa1.png?width=2273&format=png&auto=webp&v=enabled&s=97db7ebc831497e958a22c987b8dcdb42c4ce67a

// include the library code:
#include <LiquidCrystal.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 10, d5 = 9, d6 = 8, d7 = 7;
const int LED_Pin = 3; // strip connected to pin 3
const int ButtonPin = 4;  // start/stop button connected to pin 4
const int Switch = 5;   // Slider switch to control brightness connected to pin 5
const int PotPin = A0;  // Potentiometer controlling the time connected to pin A0
int value = 0; // variable to read the analog potentiometer
int Brightness = 0; // variable for brightness value
unsigned int Time = 0; // variable to store the timer value
bool LedState = false; // variable to know the state of the strip on/off
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
  // set up the LCD's number of columns and rows:
lcd.begin(16, 2);
pinMode(LED_Pin, OUTPUT);
pinMode(ButtonPin, INPUT);
pinMode(Switch, INPUT);
pinMode(PotPin, INPUT);
}
void loop() {
  value = analogRead(PotPin);                 // read the potentiometer value of the time
  value = map(value, 0, 1023, 1, 10);         // map the potentiometer to value from 1 to 10

lcd.setCursor(2, 0);
lcd.print("Time = ");                       // print the timer value
lcd.print(value);                           // print the timer value
lcd.print(" min ");                           // print the timer value
if (digitalRead(Switch) == HIGH) {          // Read the slider switch value
    Brightness = 127;                          // set the brightness level one (dim)
lcd.setCursor(4,1);
lcd.print("Low Mode ");
}
else {                                      // else
    Brightness = 254;                          // set the brightness level two (bright)
lcd.setCursor(4,1);
lcd.print("High Mode");
}
if (digitalRead(ButtonPin) == HIGH) {  // read the on/off button
while (digitalRead(ButtonPin) == HIGH);  // wait until it's released
if (LedState) {  // if the LED strip is already on
analogWrite(LED_Pin, 0);  // turn off the strip immediately
    LedState = false;  // set the state to off
}
else {  // otherwise, turn the strip on and start the countdown timer
    LedState = true;  // set the state to on
analogWrite(LED_Pin, Brightness);  // turn on the strip with the set brightness
    // Countdown timer loop
for (int sec = value * 60; sec >= 0; sec--) {  // iterate from the set value down to zero
int min = sec / 60;
int remainder = sec % 60;
lcd.clear();
lcd.setCursor(4, 0);  // move the cursor to the second row
lcd.print("   ");  // clear the previous timer value
lcd.setCursor(4, 0);  // move the cursor to the second row
lcd.print(min);  // print the remaining minutes
lcd.print(":");  // print the separator
if (remainder < 10) {  // print leading zero for single-digit seconds
lcd.print("0");
}
lcd.print(remainder);  // print the remaining seconds
lcd.print(" min");  // print the timer unit
delay(1000);  // wait for one second
lcd.clear();

if (digitalRead(ButtonPin) == HIGH) {  // check if the button was pressed again
while (digitalRead(ButtonPin) == HIGH);  // wait until it's released
analogWrite(LED_Pin, 0);  // turn off the strip immediately
        LedState = false;  // set the state to off
break;  // exit the timer loop
}
}
if (LedState) {  // if the LED strip is still on after the timer loop
analogWrite(LED_Pin, 0);  // turn off the strip
      LedState = false;  // set the state to off
}
}
}
}