Mosfet with Ceech board

[Jodaille]

Hello,

I would like to use the mosfet of the Ceech board: ATmega328p board w/ NRF24l01+ socket LTC4079

In the doc is indicated that it is wired do digital 3.
I have modified the "blink without delay" sketch

const int MOSFET = 3;
int loadState = LOW;
unsigned long previousMillis = 0;
const long interval = 2000;

void setup() {
  // put your setup code here, to run once:
  pinMode(MOSFET, OUTPUT);
  digitalWrite(MOSFET, HIGH);
  Serial.begin(9600);
}

void loop() {
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (loadState == LOW) {
      loadState = HIGH;
    } else {
      loadState = 0;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(MOSFET, loadState);
    Serial.print("state: ");Serial.println(loadState);

  }

}

I don't understand how it works, I have tried to measure continuity with a voltmeter, I have tried to wire a led between vcc, cuting the gnd with the mosfet without success.

Does anyone would be explain how I can use it ?

I would like to make an electrical barrier to protect my beehive from vespa velutina using a mosquito racket :

[Yveaux]

@Jodaille without looking at schematics I'd say you will kill/have killed the led if you don't put a current limiting resistor (few hundred ohms) in series with it.

[rvendrame]

You need to connect the LED (+resistor) like this:

• Positive: Vcc Pin
• Negative: The pin with the orange/brown wire in your picture.
  the mosfet onboard is N-channel, so it will switch the negative (GND) line.

[Jodaille]

Hello @Yveaux, hello @rvendrame: thank you.

the led is still alive :-)

With the sketch , I can see the led blinking if it is wired between gnd and d3.

@rvendrame I should miss something because the led stay off with your instructions.

Maybe @ceech will see this my SOS :-)

[rvendrame]

@Jodaille , it works for me, when wiring the led between Vcc and the non-named pin where you put that orange (or brown?) wire. There is where I found the MOSFET N-channel drain is connected.

[Jodaille]

Thank you @rvendrame ,
it works, I attach a Ceech's schema, using D4 instead of D3 :-)