Without Mosfet Gate LED is on

Projects Programming
1

Without Mosfet Gate LED is on.

When Pin is low, the led is still on. Although I used pull down resistor still no luck.

Here is the circuit link:

Circuit Design

2

What part number is on the transistor.

See Q3 or Q9

TypicalOutputs.jpg
TypicalOutputs.jpg1867×1380 496 KB

Let’s see your actual wiring.

3

What MOSFET is it? What do you mean by "without MOSFET Gate"? The MOSFET definitely has a gate.

What sort of LED is it that needs a MOSFET to switch it?

Steve

4

The Mosfet is "IRFZ44N"
Code is simple "blink" just for testing purpose.

5

Where is the LED current limit resistor?

6

Let's see your actual wiring.

Your transistor is not a logic level MOSFET, use a IRLZ44 instead.

7

groundFungus:
Where is the LED current limit resistor?

There is 3.3v only, so did not add any resistor to it.

8

larryd:
Let's see your actual wiring.

Your transistor is not a logic level MOSFET, use a IRLZ44 instead.

Thank you so much.
Can you tell me any other Mosfet for High Volt & Current (Like 24v 2A) ? Which will work with Arduino, Raspberry PI or any other MCU ? Or It can handle that ?

9

You need a Logic Level MOSFET when you are driving the Gate from a 5V pin. They are fully switched at 4.5 to 5 Volts and a typical non-Logic Level MOSFET needs 10 to 12 Volts on the Gate to fully switch. When you look at the datasheet, see what Gate-Source voltage (Vgs) they use when reporting the ON resistance (Ron).