Workshop Projects

Eight complete projects built around pins wired straight into the Uno's header.

About these projects

Several of these sketches plug parts straight into header sockets: a potentiometer across A0/A2/A4 and an LED between pins 11 and 12. Each article explains that arrangement. Always put a resistor in series with the LED, and give larger servos their own supply.

Variable-Duty LED Blinking
A potentiometer sets how much of each one-second cycle an LED stays on, from 20% to 80%.
BeginnerLEDResistorPotentiometerSerial
Analog Five-Position Servo Control
A potentiometer snaps a servo between five fixed angles: 0°, 45°, 90°, 135° and 180°.
BeginnerServoPotentiometer
Seven-Segment Character Display: LUCE
Spell L-U-C-E on one common-cathode seven-segment digit using pins 2–9.
IntermediateSeven-segmentResistor
Servo Stepping with a Pushbutton
Each button press turns a servo 45° further, wrapping from 180° back to 0°.
BeginnerServoPushbutton
Five-Speed Symmetrical LED Blinking
A potentiometer picks one of five blink speeds; on and off times are always equal.
BeginnerLEDResistorPotentiometerSerial
Custom Servo Angle Sequence
A button steps a servo through a list of angles stored in an array: 90, 45, 135, 0, 180.
BeginnerServoPushbutton
Seven-Segment Character Display: LAOS
Spell L-A-O-S on a common-cathode seven-segment digit with the same pins as LUCE.
IntermediateSeven-segmentResistor
Three-Zone Potentiometer Servo Indicator
A servo rests at 90° and repeatedly waves toward 45° or 135° depending on which third of the knob is selected.
IntermediateServoPotentiometer