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Driving a MOSFET using ESP-01 - Need Help
Posted:
Tue Sep 07, 2021 2:33 amby Amorphous
I am trying to drive a MOSFET using ESP-01 to control 12V supply. Schematic is attached. Here is my simple code -
Code: Select all#include <ESP8266WiFi.h>
#define MOSFET 2
#define SWITCH 0
#define DEBUG True
void setup() {
pinMode(SWITCH, INPUT); // Initialize the GPIO2 pin as an output
pinMode(MOSFET, OUTPUT);
digitalWrite(MOSFET, HIGH);
}
void loop() {
digitalWrite(MOSFET,HIGH);
// put your main code here, to run repeatedly:
} But its not switching. What am I doing wrong? Pls help
Re: Driving a MOSFET using ESP-01 - Need Help
Posted:
Fri Sep 10, 2021 11:36 amby Michaelo
You should be able to drive the MOSFET directly via a 10k current limiting resistor to its Gate?
The Gate Threshold Voltage (Vgs(th)@Id) : 3V 250uA...
Drain Source On Resistance (RDS(on)@Vgs,Id) : 0.009Ω 30A,10V
What's happening with the current circuit?
Re: Driving a MOSFET using ESP-01 - Need Help
Posted:
Sat Sep 11, 2021 3:39 amby schufti
with a 10k resistor the gate (dis)charges much to slowly and mosfet will slowly pass through linear region, causing lots of powerdissipation -> defect.
for mosfets and digital signal you want the gatecurrent as high as possible. So for 3.3V and Igpio (max) 10mA you want 330Ohm resistor in series with the gate.
Re: Driving a MOSFET using ESP-01 - Need Help
Posted:
Sat Sep 11, 2021 7:02 pmby Michaelo
First get it working, then you can discuss the gate resistor...
Having said that, I admit 10k is a little high but were only switching milliamps, nothing will be damages...