Components

· 1 Smowboard Think Mini

· 6 male-to-female jumper wires

· 2 male-to-male jumper wires

· 1 potentiomet

· 3 100 ohm resistors

· 1 red LED

· 1 green LED

· 1 yellow LED

In this circuit, we have used 3 different coloured LEDs to build a traffic signal. The cathode of all the three LEDs are grounded by connecting them to the ground pin of Smowboard. To limit the flow of current a 100 ohm resistor is connected across each LED in series with the acthode side. The anode pin of the Red, Yellow and Green LED is connected to pin number 2,4 and 5 of the Smowboard that provides PWM signal to control the LED's. We also use a potentiometer in the circuit that connected with 3.3V and GND pins of Smowboard. It's signal pin is connected to Smowboard's pin 34 that supports Analog to Digital conversion. Using this circuit, the analog signal from the potentiometer is scaled and provided to the LED to operate Red, Yellow and Green light.