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Arduino Uno Anatomy
14 Digital pins labelled 0 to 13
Digital = “High” or “Low”; Input or Output
High is about 5 Volts; Low is about 0 Volts
Try and avoid using pins 0 and 1 as they are also used with programming the Arduino
6 Analog Inputs labelled 0 to 5
Can be used to measure electrical voltages between 0 Volts and 5 Volts. Used to measure properties of the real world when used with the right sensors
Power Connectors
Provides limited power to external circuits.
USB Connector
Connects to host computer
Power Connector
Provides power to circuit for
operation without a host computer. Recommended range is 7 to 12 volts. A voltage regulator on the board will generate a 5V supply.
ATMEL Microcontroller
The “brains” of the Arduino
programming LEDs
Flash to show programming operation
Power LED
Shows when Arduino is on
Reset button
Press to restart the program. Reset happens automatically on power-on or when programming is completed.
Pin 13 LED
Shows the state (high or low) of pin 13. Lights up with the pin is high.
Labelled “L”