TCRT5000 Optical Sensor Circuit

Discussion in 'The Projects Forum' started by dahrich, Jun 3, 2013.

  1. dahrich

    Thread Starter New Member

    Aug 14, 2011
    I want to start and stop a turntable using the TCRT5000 to sense position.
    I think I can take the output of the TCRT and connect it to a reed relay or some other amp but I don't know how to build the TCRT circuit. In particular I don't know how to size any resistors needed to drive the TCRT correctly. Also I think I need 5 volts from the TCRT and am sure the resistors determine this.

    Any circuit diagrams or other help is greatly appreciated.


  2. mik3

    Senior Member

    Feb 4, 2008
    You can drive the input (LED emitter) with more than 5V provided you limit the current to around 30mA.

    The output transistor can be used as a normal transistor. You can put a 10K resistor in series with it and power it from a 5V source for example.