help needed for novice please

Discussion in 'The Projects Forum' started by welshvicar, Nov 10, 2014.

  1. welshvicar

    Thread Starter New Member

    Nov 10, 2014
    Hi all,
    I have a project that requires a magnet to be swiped over a single point to activate a motor and keep the motor on until the magnet is swiped over the same point to stop the motor
    it is a small motor running of a 9 volt battery. using a reed switch or hall sensor
    i cant seem to find a suitable relay for the job. any ideas or diagrams would be great.
    also space is an issue so needs to be compact
  2. MaxHeadRoom


    Jul 18, 2013
    The relay rating depends on the rated motor current, you could use one of the Honeywell SS400 series of hall sensors, a bi-directional latch type, it can be energized by one pole, and it will stay latched until swiped with the reverse pole.
    Something like a 2n7000 mosfet could be used between the sensor and the relay.