Raspberry Pi Pico GP15 ordinary red LED breadboard wiring A horizontal Raspberry Pi Pico drives an ordinary red LED from GP15 through a 220-ohm resistor. The LED cathode returns to a visibly sourced ground rail. BOOTSEL VBUS VSYS GND 3V3_EN 3V3 ADC_VREF 28 AGND 27 26 RUN 22 GND 21 20 19 18 GND 17 16 0 1 GND 2 3 4 5 GND 6 7 8 9 GND 10 11 12 13 GND 14 15 A long K short Ordinary LED · GP15 output Exact physical circuit for the Day 1 external-LED activity using Pin(15) GP15 output GND + − unused unused a b c d e CENTRE CHANNEL f g h i j − + GND unused 220 Ω GP15 · physical pin 20 Before connecting USB ✓ GP15 reaches the LED only through the 220 Ω resistor. ✓ Long anode faces the resistor; short cathode / flat edge faces GND. ✓ Bottom GND rail is visibly connected to Pico GND. ✓ One contact per visible hole; partner checks the unpowered circuit.
Original course artwork informed by the official Freenove LED lesson. It matches the Day 1 external-LED activity after changing the example to Pin(15, Pin.OUT). The HTML table is the authoritative electrical specification.

Exact connection list

FromThroughTo
Pico GP15, physical pin 20green jumper, then 220 Ω resistorLED long anode leg
LED short cathode leg / flat edgeblack jumper and bottom GND railPico GND, physical pin 13