Automated gate with additional safety features

Discussion in 'The Projects Forum' started by tech.str, Dec 6, 2015.

  1. tech.str

    Thread Starter New Member

    Dec 6, 2015
    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:
    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.png Would this be OK for the limit switches?
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    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.