b'DIGITAL OUTPUT: When working with SCL SDA AREF GND 13 12 ~11 ~10 ~9 8 7 DIGITAL (PWM ~)~6 ~5 4 ~3 2 1 TX 0 RX microcontrollers such as the RedBoard, there 13TX are a variety of pins to which you can connect RX ONelectronic components. Knowing which pins C106 START SOMETHINGperform which functions is important when C106 I/O ISP building your circuit. In this circuit, we will be 3.3V 5VC106 using what is known as a digital output. There IOREF RESET 3.3V 5V GND POWER GND VIN A0 A1 ANALOG IN A2 A3 A4 A5 are 14 of these pins found on the RedBoard. A digital output only has two states: ON or OFF. These two states can also be thought of as HIGH or LOW, TRUE or FALSE. When an LED is connected to one of these pins, the pin can only perform two jobs: turning on the LED and turning off the LED. Well explore the other pins and their functions in later circuits.NEW IDEASELECTRICAL SAFETY: Never work on your circuits while the board is connected to a power source. The SparkFun RedBoard operates at 5 volts, which, while not enough to injure you, is enough to damage the components in your circuit.COMPONENT ORIENTATION & POLARITY: Instructions on how to orient each of the new components will be given before each circuit diagram. Many components have polarity and have only one correct orientation, while others are nonpolarized.R E S I S TO R L E A D SComponents like resistors need to have FLAT EDGE their legs bent into 90 angles in order to+ correctly fit in the breadboard sockets.SHORT LEGP O L A R I Z E D C O M P O N E N T SPay close attention to the LED. The negative side of the LED is the short leg, marked with a flat edge.14 : circuit 1a'