Automated gate with additional safety features

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tech.str

Joined Dec 6, 2015
1
I am doing a school project which involves creating an automated gate which responds to light as well as another form of energy. I am fairly sure of what to do for the basics of the circuitry and the mechanisms, but there are some aspects of the circuitry I am not so sure. Here is the basic schematic of the design I created:
upload_2015-12-6_22-34-35.png
Could you give me advice on how to use incorporate limit switches into the circuit (as it's a bi-fold swing gate, it will need 4). Or would a timer circuit work better?
Also, would it be feasible to use multiple reed switches or a programming chip so that the gate can open at night when a vehicle approaches?
upload_2015-12-6_22-39-37.pngWould this be OK for the limit switches?
 

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Alec_t

Joined Sep 17, 2013
11,419
Reed switches can carry only a small current so would not handle motor current.
Think about how much power you will need to move a heavy gate at a certain speed, choose a suitable motor with appropriate gearing, then select switches suitable for the peak (stalled) motor current.
Your light-operated circuit needs hysteresis to prevent erratic operation with slight changes in light level.
 
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