Kids OK, with an adult
DIY project. Children must build this only with an adult (16+ years) beside them at all times. Not suitable for children under 8 years.
Setup: create a bot with @BotFather, paste the token and Wi-Fi in the code, flash with USB-TTL (IO0 to GND while uploading), then send /start. Use a 2A supply.
Strictly follow the description given with this video.