HELP- Configure Phototransitor Circuit as On/Off Switch for motor

Discussion in 'The Projects Forum' started by jemanthe, Apr 28, 2010.

  1. jemanthe

    Thread Starter New Member

    Apr 28, 2010
    Can some one please tell me how to create the following circuit. My goal is to use an IR phototransistor as an on off switch for small motor.

    I would like to use the following:

    · Matched Infrared Emitter and Phototransistor Detector

      • 1 x infrared emitter - 2V 40mA
      • 1 x phototransistor detector - 20V 25mA
    · 1.5-3V DC Metal Gear Motor

      • 0.18-0.25A no load
      • 0.70A max efficiency
    · 1.5 V Battery

      • 1.5V sufficient??????
      • Do I need to use 3V-?????
    · Resistor

      • Type- ????
      • Resistance- ?????
    I am not sure what configuration to wire this in. Any suggestion would be greatly appreciated!!!!
    Thanks in Advance,
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    The IR diode will need 3V,& 27 ohm resistor[ depending somewhat on spacing of diode and transistor ].Motor can run on 1.5V with proper driver. Might look at JPK777, pg 19. Are you using a beam break for control?