Start / Intro Labs
Output, external output, multiple outputs, digital input, then analog input and PWM. Begin with the Uno; extend each build through experiments and advanced sketches.
5 labs · one connected sequence
Upload a sketch that switches the LED already on the Uno on and off.
Build A one-second on, one-second off built-in LED blink.
Lab 2 builds the output circuit yourself on a breadboard.
Recreate blink with a breadboard LED, its resistor and a wire to digital pin 8.
Build An LED on D8 that blinks one second on, one second off.
Lab 3 repeats this same circuit pattern for multiple independently timed outputs.
Build three copies of the LED circuit and sequence them with explicit instructions.
Build Three individually driven LEDs on D8, D9 and D10 in a traffic-light-like sequence.
Lab 4 replaces a fixed timed sequence with behavior controlled by a human button.
Press a button to light an external LED and read an active-low input.
Build A button between D2 and GND turns a current-limited D8 LED on while pressed.
Lab 5 replaces the button’s two states with a range of measured analog values.
Measure a changing voltage on A0 and set the brightness of a resistor-protected LED on PWM pin D9.
Build A knob controls the perceived brightness of an external LED.
Use this control chain next with light or temperature sensors, RGB LED, buzzer or a separately powered actuator design.