Components

1 Smowboard Think Mini
1 L293D IC
1 DC Motor
1 Fan propeller
1 potentiometer
1 Screw driver
2 push buttons
8 male-to-male jumper wires
8 male-to-female jumper wires

In this circuit, we use the L293D IC to control the DC Motor. We connect the pin number 1 of the IC which is the ENABLE pin to the Vin pin of Smowboard. We also connect the pin number 8 of the IC which is Vcc2 pin and the pin number 16 of the IC which is Vcc1 pin to the Vin pin of Smowboard. The IC is grounded by connecting its pin number 4 which is the ground pin to the ground of Smowboard. The pin number 2 of the IC which is the INPUT1 pin is connected to the pin number 4 of Smowboard. The INPUT2 pin of the IC which is pin number 7 is connected to the pin number 2 of Smowboard. These two input pins are controlled by the Smowboard. We connect the pin number 3 of IC which is the OUTPUT1 pin and pin number 6 of the IC which is the OUTPUT2 pin to the DC Motor. We connect a fan propeller to the shaft of DC Motor which works as a fan. We use two push buttons to turn ON or OFF the fan. We ground the push buttons by connecting one of their pins to ground of Smowboard. The other pin of first button is connected to pin number 22 of Smowboard while that of the second button is connected to pin number 23 of Smowboard. The push buttons will be controlled using the Smowboard. We use a potentiometer to control the speed of the fan. The potentiometer is grounded by connecting its ground pin to the ground of Smowboard. The power supply is provided to the potentiometer by connecting its Vcc pin to the 3V3 pin of Smowboard. The middle pin of the potentiometer is connected to the pin number 13 of the Smowboard.

The Smowboard controls the state of the motor with the help of the motor driver IC. The state of the motor is manually controlled using push buttons. When one push button is clicked, the Smowboard sends a signal to the IC to turn OFF the motor. When the other push button is clicked, the Smowboard sends a signal to turn ON the motor. Thus, the motor is turned ON or OFF using push buttons. The speed of the fan is controlled using a potentiometer. When the potentiometer rotates, the Smowboard smartly reads different analog values from the potentiometer and sends different signals to the motor driver IC depending on the value read from the potentiometer. Thus, the motor rotates at different speeds.

DC Motor manual flow 1