basic LED circuit

There are two different ways to wire up a basic LED circuit to ESP32 3V and GND

Hookup Pattern (1)

1. Connect ESP32 GND to a blue bus on the side of your breadboard
2. Connect ESP32 3V to a red bus on the side of your breadboard
3. Use a 220R (or similar) to run the 3V signal to the inside of your breadboard
4. Connect the longer of the two LED pins to 220R, the shorter pin goes to and adjacent row
5. Connect the shorter LED pin to GND with a wire

Hookup Pattern (2)

1. Connect ESP32 GND to a blue bus on the side of your breadboard
2. Connect ESP32 3V to a red bus on the side of your breadboard
3. Use a wire to run the 3V signal to the inside of your breadboard
4. Connect the longer of the two LED pins to the wire, the shorter pin goes to and adjacent row
5. Connect the shorter LED pin to GND with a 220R

blink.py (internal LED)

There is a built-in (internal) LED on the ESP32 that is tied to pin 13, the code below will cause it to rhythmically blink

'''
blink.py (internal led)
'''

from machine import Pin
from time import sleep

led = Pin(13, Pin.OUT)

while True:
    led.value(1)
    sleep(0.5)
    led.value(0)
    sleep(0.5)

blink.py (external LED)

With some simple rewiring one can connect the external LED from above to pin 13 so it blinks in time with the built-in (internal) LED

Hookup Pattern

1. Connect ESP32 GND to a blue bus on the side of your breadboard
2. Connect ESP32 3V to a red bus on the side of your breadboard
3. Connect a wire from ESP32 pin 13 to the longer of the two LED pins, the shorter pin goes to and adjacent row
4. Connect the shorter LED pin to GND with a 220R