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I want to start a simple hobby project, but have no idea where to start.
I just want to trigger a buzzer if anything enters an entrance heavier than a certain weight.
It don't have to be accurate, but as cheap as possible.
If someone can please point me in the right direction?
Ok heres some questions for you to answer to help you define the outcomes that you may require
first
1. define the sensor type To measure the weight - assumption person will step on sensor
doing a quick google - check out sensors
http://www.kerrmedical.com/weightsen...mmonitors.aspx
http://www.medicalproductsdirect.com/alprmasmwese.html
simple pressure mat cant measure weight
http://www.jaycar.com.au/productView.asp?ID=LA5131
2. pick an pic which will allow a analog input , most do ,these type of mat produce a voltage relative to a weight so hooking it up is easy enough as most provide details of the interface to most alarms system they support.
get that far and it s a starting point
Thank you very very much, I will do some research on that!!!
What other types of sensors can distinguish between a large object (eg vehicle / human) and a small object, or just ignore the small objects?
What will be the maximum distance for detection?
Sorry for the late response.
About 2 meters
some interesting sensors which may help
http://www.hokuyo-aut.jp/02sensor/
Great, thank you!!!