Introduction: Auto Test Pen With Double Function

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Hello, friends.

Today we are going to do here is a probe car. It has two functions, namely - a show contact with the car body, as well as the presence of a voltage of 12 volts.

Detailed assembly and demonstration work can be seen on the video.


Step 1:

We need

  • Syringe 5 cubes;
  • 4 LR44 batteries;
  • Two LEDs with a resistor;
  • A piece of steel wire;
  • Wire with a clip at the end;

Step 2: Very Simple Scheme

Step 3: Oppositely Connect Two LEDs

Step 4: Solder Resistor, Steel Wire, and Fill It With Hot Glue

Step 5: Bend the Contact and Put Into a Syringe

Step 6: Put the Battery

All is ready.

Detailed assembly and demonstration work can be seen on the video.

Thank you for attention.