Components

1 Smowboard Think Mini
1 Servo Motor
1 green LED
1 100 ohm resistor
1 push button
2 male-to-male jumper wires
5 male-to-female jumper wires

In this circuit, we use a servo motor to create a toll barrier. The servo motor is grounded by connecting one of its pin to the ground of Smowboard. A power supply is given to the motor by connecting one pin to the Vin pin of Smowboard. The third pin of the servo motor is connected to the pin number 2 of Smowboard. The Smowboard controls the motor with this pin. The LED is grounded by connecting its cathode to the ground of Smowboard. To limit the flow of current a 100 ohm resistor is connected in series with the cathode side. The anode of LED is connected to the pin number 4 of the Smowboard. We use a push button. The servo motor will operate when this button is clicked. The push button is grounded by connecting one of its pins to the ground of Smowboard. The other pin is connected to the pin number 23 of Smowboard.

The servo motor is connected to the Smowboard. Smowboard smartly controls the rotation of the motor. Thus, when the push button is clicked, the motor rotates by an angle of 90 degrees. The Smowboard also controls the voltage across the LED which is connected. When the push button is clicked, a voltage is applied across the LED. A current flows across the LED due to this voltage and the LED glows indicating the driver a GO signal.

Toll Barrier