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Start/Stop Switch with indicator light

Discussion in 'LEDs and Optoelectronics' started by add2008, Apr 27, 2012.

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  1. add2008

    add2008

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    Apr 27, 2012
    How would I connect an indicator light to a start/stop motor switch. The light should come on when the start button is pressed (motor on) and turn off when the stop button is pressed (motor off). Any schematics would also help. Thanks.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    If the start button applies power to the motor and the stop button removes it, then simply connect the bulb in parallel with the motor.
     
  3. DLJ

    DLJ

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    Apr 27, 2012

    This will only work if the bulb is rated for the particular voltage.

    If the bulb will burn out due to too much voltage, or if you think it might, you could power a relay with the motor's power source, and have a second lead from the power source to run through the relay to power the bulb, and reduce the voltage to an appropriate level via use of resistors.

    Find the difference between the power supply's voltage output, and the optimum voltage for the bulb. Take the difference, divide that by the amperes the bulb will draw (bulb watts/bulb voltage), and that will tell you the resistor you'll need to use.

    (PS.V)-(B.V)/(B.W/B.V)=R

    PS=Power supply
    B=Bulb
    V=Voltage
    W=Watts
    R=Resistor needed
     
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