Hello everyone! New to the forum here! I'm quite novice at circuit building and designing, but what I have on this project so far is about how far my knowledge goes on electronic circuitry.
So me and a small team of engineering university students are attempting to build a 3-tier smoke detector.
I designed a circuit that uses three switches in place of the detector components. When the first switch is opened, or disconnected, one light goes on. Then when the second switch is opened, a second light goes on, along with a buzzer. And when the third switch is opened, a light goes on, a buzzer sounds, and it opens a transistor gate to activate another device. I used a capacitor on the third one to allow the light to fade off as well, and a reset button to discharge the capacitor afterwards.
WHAT I NEED, is a way to replace the switches with photoresistors. The idea would be that when a laser's path is blocked by smoke, it acts as opening the switch. I tried paralleling the photoresistor with another resistor just below the photoresistors highest resistance, but this didn't work.
(FYI it's a 9 volt battery)
Here's a schematic from a circuit simulator app at http://www.falstad.com/circuit/
(the circles are LEDs)
and if you would like to simulate my circuit yourself, I'll reply to this message with the code you can use in the file > import menu.
Thank you so much for taking your time, I really appreciate it!
So me and a small team of engineering university students are attempting to build a 3-tier smoke detector.
I designed a circuit that uses three switches in place of the detector components. When the first switch is opened, or disconnected, one light goes on. Then when the second switch is opened, a second light goes on, along with a buzzer. And when the third switch is opened, a light goes on, a buzzer sounds, and it opens a transistor gate to activate another device. I used a capacitor on the third one to allow the light to fade off as well, and a reset button to discharge the capacitor afterwards.
WHAT I NEED, is a way to replace the switches with photoresistors. The idea would be that when a laser's path is blocked by smoke, it acts as opening the switch. I tried paralleling the photoresistor with another resistor just below the photoresistors highest resistance, but this didn't work.
(FYI it's a 9 volt battery)
Here's a schematic from a circuit simulator app at http://www.falstad.com/circuit/
(the circles are LEDs)
and if you would like to simulate my circuit yourself, I'll reply to this message with the code you can use in the file > import menu.
Thank you so much for taking your time, I really appreciate it!
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