I'm planning to make a project that detects if the object is a plastic bottle or not. May I ask what sensor is good to use ? I need something cheap haha. I'm planning to use a Capacitive Proximity Sensor but I'm not sure yet
I am not sure how you could differentiate a plastic bottle from every other object that can be put in front of a sensor.
Are you trying to tell the whether the object is an aluminum can vs plastic bottle?
vinceherman:
I am not sure how you could differentiate a plastic bottle from every other object that can be put in front of a sensor.
Are you trying to tell the whether the object is an aluminum can vs plastic bottle?
Well I don't have to specifically know what object is in front. I just need to know if the object in front is a plastic bottle if its not then prints nothing but if it is then prints smthing
Oh such a simple task! You need: One gas torch and an air-quality sensor. Gastorch blows at object. If it is glass, air quality stays the same. If it is plastic, air quality will suffer. If it is himan ... air quality will suffer, too ...
Nice idea but...there are no simple cheap sensors that can distinguish between a) one of the many types of plastic bottle and b) everything else that comes past that might be made of plastic but isn't a bottle or might be a bottle but isn't made of plastic.
Steve
I'm sure you can train a dove to pick at a touchscrren if it's a fake plasticbottle.
slipstick:
Nice idea but...there are no simple cheap sensors that can distinguish between a) one of the many types of plastic bottle and b) everything else that comes past that might be made of plastic but isn't a bottle or might be a bottle but isn't made of plastic.Steve
Do you have any sensor recommendation?
Pay somebody some bucks to do the job?
zwieblum:
Pay somebody some bucks to do the job?
Hi I'm sorry for not being clear. I actually need a sensor since the project I'm going to make is if the thing thrown is a plastic bottle then I'm going to use a servo to accept it inside a box then if its not then its going to reject. So I really need a sensor
If you glue a human into place, then you do not need a servo.
You can use X-Rays to detect plastic, you'd need something more massive, computing power, than an Arduino.
Idahowalker:
You can use X-Rays to detect plastic, you'd need something more massive, computing power, than an Arduino.
Is there an easier suggestion ? Since the project is only a prototype for an arduino based project. I only need a sensor like capacitive sensor but something that can distinguish plastic bottles from any other thing
You can use a SWIR (Short Wave Infrared) and a spectral signature library to detect plastics; not something an Arduino can do.
Or an open microwave + camera: if sparks appear, it's metal. if it object gets warm, it's plastic.
There is no simple solution for your request.
Read this comic for some insight.
You're asking the impossible. There is no sensor that can tell the different between e.g. a plastic bottle and a box made of similar plastic. You'd need to recognize both the material and the shape. Not really an Arduino job and definitely not cheap.
Steve
slipstick:
You're asking the impossible. There is no sensor that can tell the different between e.g. a plastic bottle and a box made of similar plastic. You'd need to recognize both the material and the shape. Not really an Arduino job and definitely not cheap.Steve
And then there are millions of formulae for plastic. Each will have some different response to what ever sensor you pick. Then there are coated plastic bottles. Plastic bottles with printing on them. And on and on.
Paul
Shiho:
Hi I'm sorry for not being clear. I actually need a sensor since the project I'm going to make is if the thing thrown is a plastic bottle then I'm going to use a servo to accept it inside a box then if its not then its going to reject. So I really need a sensor
you can use machine learning with camera...
.. or pay somebody to do the job. will be cheaper anyway ... and it'll work.
Plastic has a high electrical resistance.
Metals are generally good conductors.
Try to pass a current through the object, no current (=plastic), current and circuit connection (=metal), coatings on the cans may cause an issue (acting as an insulator and this a false plastic positive)
Worth looking into IMO.
Cheers,
Miner_jeff