We want to make something geeky for this Halloween. Something with addressable RGB leds and with a WiFi microcontroller.

Supplies

We will need:

Pumpkin (obviously)
knife
spoon
esp8266 microcontroller (example https://www.amazon.com/HiLetgo-Internet-Development-Wireless-Micropython/dp/B010N1SPRK)
ws2812b leds or any RGBIC (example https://www.amazon.com/ALITOVE-Individual-Addressable-Programmable-Non-Waterproof/dp/B01MG49QKD)
wires
soldering iron

Optional:

7.4V 450mAh 2S LiPo Battery (example https://www.amazon.com/flite-400mAh-7-4v-LiPo-Battery)/dp/B01632PB34
buck convertor to 5v (example https://www.amazon.com/Maxmoral-MP1584EN-Converter-Adjustable-Step-Down/dp/B07RWV51YB)

Step 1: Carve the Pumpkin

Look up a design you like, and then have fun.

Remember to ask an adult for supervision at this step !

Step 2: Wire Your Controller

First a little theory.

The WS2812B is an RGB LED in the SMD 5050 case with WS2811 controller already integrated.

The ESP8266 is a system on a chip (SOC) Wi-Fi microchip for Internet of Things (IoT) applications produced by Espressif Systems.

We need either to power it via the usb connector or supply it with a 5v from a LiPo battery and a buck convertor.
I won't go into details here. You can find lots of tutorials on the internet (including this one here https://www.instructables.com/ESP8266-controlling-Neopixel-LEDs-using-Arduino-ID/)