[Lab] PIR, IRF540, PN2222, LED Strip, Arduino

[Ken McKinnon]

I think if you might help yourself (and us) by using a graphic circuit 
drawing tool like fritzing which is a circuit drawing tool that (I 
think) was made for the arduino landscape.

http://fritzing.org/home/

Trying to picture your cicuit based on what you describe is a bit 
difficult.  At best, I can think that your PIR might need a pull-up for 
the input, and I'm not sure why you need a mosfet and a transistor..?

Your code looks OK at a first glance, pretty basic, but OK.  Of course, 
you are wasting a lot of horsepower for a circuit that could be handled 
by a 8 pin 555 timer IC, but ...

Ken



On 2018-03-17 3:10 PM, Bruce Harding wrote:
> Hello,
>
> I'm trying to get the pinning right for a project where a PIR triggers 
> a LED strip to turn on.  I'm having real trouble getting the pinning 
> on the breadboard right. If someone is willing to take a look at it 
> I'd be grateful. Beer or coffee on me.
>
> I'm using:
>
> 12v 3A power supply
> PIR
> IRF540 Mosfet
> PN2222 Transistor
> 1m Warm/White LED Strip
> Arduino Uno
>
>
> Code:
>
> //constants
> const int ledPin = 5;
> const int sensorPin = 4;
> const long stayOnPeriod = 900;   // length of time to stay on (in 
> milliseconds)
>
> //variables
> unsigned long turnOffTime = millis();  //Start with the led turned off
>
> void setup() {
>   pinMode(ledPin, OUTPUT);
>   pinMode(sensorPin, INPUT);
> }
>
> void loop() {
>   // check if the sensor is detecting then increase the time to stay on.
>   if (digitalRead(sensorPin) == HIGH)
>   {
>     turnOffTime = millis() + stayOnPeriod; //e.g. 128 + 256 =384
>   }
>
>   if (turnOffTime > millis())  //384 > 129
>   {
>     digitalWrite(ledPin, HIGH);
>   }
>   else
>   {
>     digitalWrite(ledPin, LOW);
>   }
> }
>
>
> -- 
> ====
> bruce
> faintfuzzies.ca <http://faintfuzzies.ca>
>
>
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