led

Projects Programming
1

Okay so here is what I'm trying to do.

I want to control how long an led blinks and when it blinks with a pot and a photo transistor. The pot will control how long and the pt will tell it when to blink.

I can go into more detail when I get home from work. Lol
thanks

2

You won't do it with a phototransistor - or not very well, anyway. You really want an LDR - Light Dependent Resistor (also known as Cadmium Sulphide Cell) wired in a resistive divider. A phototransistor only has a very tiny area where the output is variable - it's mainly seen as ON or OFF.

Then, something like:

delay(analogRead(0));
digitalWrite(13,HIGH);
delay(analogRead(1));
digitalWrite(13,LOW);

with the LDR on A0 and the pot on A1 should give the desired results.

3

I want to control how long an led blinks and when it blinks with a pot and a photo transistor.

More detail needed here please.

Look at the blink without delay sketch to see how to blink an LED correctly.

4

Or do you mean you want it to wait until the PT goes ON and then do one blink?

5

majenko:
Or do you mean you want it to wait until the PT goes ON and then do one blink?

yeah. That's all the pt needs to do. I want the led to blink every 4 times the pt senses light.