Light sensor Board switch help

Discussion in 'The Projects Forum' started by tc61, Dec 13, 2013.

  1. tc61

    Thread Starter New Member

    Feb 11, 2009

    I have one of these boards ( ). I would like to use the output terminal to switch a N type Mofset that will run a small motor. My question is when I use the digital output it turns on and off. On it shows close to the input voltage of the sensor 5v (shows 4.938) but when it goes off it never goes to 0 volts.
    When it is low should there be voltage and will this voltage effect the MOFSET being it a 0-5v base. If I use the analog output it never gets low enough to turn off the MOFSET. Any suggestions?

    Thank you in advance.
  2. BobTPH

    Active Member

    Jun 5, 2013
    How close to zero? If it is well below the theshold voltage of the MOSFET you should be okay. Also, make sure you are using a logic level MOSFET, one the is fully on at 5V. Most MOSFETS require more like 10V to turn on completely.

  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    Do you have a pull-down resistor on the gate of the MOSFET?