Voltboy
New Member
Hello.
Im making a project in which a IR phototransistor detect a fire, and turn on a motor (the fan) the extinguish the fire. The problem is that when the fire is almost extinguished, the motor turns off, so the fire come up again, and then the fan almost extinguish it, but the PT turn off. And again, and again.
So I cant extinguish the fire.
The normal answer will be "use a more sensitive PT". I thought that too, but I have to give out this project tomorrow, and I can only make something with what I have in my house (Resistors/Capacitors).
I thought of using a RC circuit in there.
In the picture, the actual circuit is all. The RC circuit I'm trying to add is circled by a red circle.
If you have any opinion on how to do it with capactiors/resistors just post it.
I know I could use IC's, but the project is for tomorrow and I cant get IC's now.
Im making a project in which a IR phototransistor detect a fire, and turn on a motor (the fan) the extinguish the fire. The problem is that when the fire is almost extinguished, the motor turns off, so the fire come up again, and then the fan almost extinguish it, but the PT turn off. And again, and again.
So I cant extinguish the fire.
The normal answer will be "use a more sensitive PT". I thought that too, but I have to give out this project tomorrow, and I can only make something with what I have in my house (Resistors/Capacitors).
I thought of using a RC circuit in there.
In the picture, the actual circuit is all. The RC circuit I'm trying to add is circled by a red circle.
If you have any opinion on how to do it with capactiors/resistors just post it.
I know I could use IC's, but the project is for tomorrow and I cant get IC's now.