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Keychain Flashlight


Learning how to assemble the Keychain


  • Learn to solder
  • Build the Keychain Flashlight
  • Assembly

    Included Components 

    Let's go through all the components of the Keychain Flashlight


    All Parts x Qty
    Flashlight PCB x 1
    White LEDs x 3
    6mm Tactile Button x 1
    Battery Holder x 1
    Battery x 1

    Tools you'll need

    Flush Cutters
    Solder Wire
    Soldering Iron

    Soldering the Battery Holder 

    On the back of the Flashlight PCB you'll find a big silver circle marked with BT1. Take your Battery Holder component with the open side facing towards the bottom of the PCB. Place it through the two hole beside the big silver circle. Once in place flip the PCB over to the front and solder the two leads.

    Line up the Holder
    Place Holder through the holes
    Solder these joints

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    Soldering the Button 

    Staying on the front of the board take your 6mm Tactile Button and place it through the holes around SW1. Once in place flip the PCB over to the back and solder the four leads.

    Line up the Button
    Place Button through the holes
    Solder these joints

    Soldering the LEDs 


    LEDs have polarity, which means that they only allow current in one direction. We must make sure to place them in the correct orientation. One leg of the LED is longer than the other, this is the positive leg. It will go into the circle hole. While the other shorter leg will go into the square hole.

    Place all an LED through the front and into the LED1 holes then bend it towards the top of the board. Repeat this for all 3 LEDs and then flip to the back and solder all the leads.

    Line up the LED
    Place LED through the holes
    Bend LED
    Solder the LED

    Inserting the Battery 


    The Battery like the LEDs has polarity. It has a smooth smooth that is positive and a negative rough side.

    With the back of the board facing up slide the Battery into the holder with it's smooth positive side also facing up.

    Align Battery
    Battery In

    Congrats! You should now have a Keychain Flashlight. If it doesn't light up when pressed maker sure your battery is in the right way. Double check the orientation of your LEDs. Remember that if you touch up any solder joints to take the battery out.

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