Cytron Technical Forum

Which type of sensor that suitable for detecting smoke?

maybe you can try this, http://www.cytron.com.my/viewProduct.ph ... ke%20Alarm

It's better if the detector device or module is cheaper and easier to build.. thx for reply ^^

Apparently there is! It's a package of a IR LED and a IR phototransistor. They are not aligned therefore no output voltage from the phototransistor. But when there is smoke, infrared light will be reflected to the phototransistor. Therefore an output voltage is available for triggering. Try these links:

http://www.google.com.my/search?q=smoke+detector+circuit&hl=en&prmd=imvns&source=lnms&tbm=isch&ei=4-vcTp6XLYL5rQfx76mIBw&sa=X&oi=mode_link&ct=mode&cd=2&ved=0CCYQ_AUoATgK&biw=1366&bih=667

http://en.wikipedia.org/wiki/Smoke_detector (Optical)

Hope this helps!