# harry potter Published articles for harry potter. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Magic Cauldron: Harry Potter Themed Gender Reveal Party DevFeed: [Magic Cauldron: Harry Potter Themed Gender Reveal Party]() Original publisher: [Read original article]() Author: Suresh Alse (noreply@blogger.com) Published: 2024-10-01T06:22:00Z Content type: tutorial Language: en Sources: [Life Plus Linux]() Topics: [Arduino](), [Library]() Tags: [arduino](), [aurdino](), [harry-potter](), [led](), [library]() ### AI overview The article explains how the author built a Harry Potter-themed Magic Cauldron for a gender reveal party using an Arduino UNO, dry ice, a WS2812B LED array, and a wired serial connection. It describes the fog effect, LED control with the FastLED.h library, and four reveal stages. ### Source excerpt Earlier this year, we had a very fun filled Harry Potter themed gender reveal party. For the reveal, I built a Magic Cauldron which would reveal the gender. Check it out for yourself! For this I needed: A Cauldron. WS2812B LED array. Aurdino UNO. Bread board and jumper wires. Dry ice. Kasa Smart bulbs I will go over in the following sections The Mist. Serial Bus. LED orchestration. Room effect. The Mist Dry Ice is solid carbon dioxide which is at a very low temperature of -78.5°C. When put in water at room temperature, it rapidly sublimates to create the fog/ mist effect. The hotter the water, the denser the mist and the quicker the effect occurs. So, it is important to have a balance - I preferred to have water heated up for 10s in microwave before I began. To prevent the mist from spreading too far, place the water in a smaller bowl inside the cauldron. Make sure to get the dry ice the same day as the event if you don't have the means to store it. Even when stored in the freezer, you will lose a lot it through sublimation. Always handle dry ice with care--never touch it with bare hands, as it can cause instant frostbite--and keep it out of reach of children. Serial Bus The serial bus acts as a communication channel between my computer and the Arduino via a wired connection. We didn't know the baby's gender, and neither did anyone else. The plan was to have a trusted person open the envelope and provide the answer to start the reveal! Enter mode: b: boy, g: girl, d: dry run: I used the serial bus to relay this information to the Aurdino. LED orchestration I used a WS2812B LED array with 60 individually addressable LEDs, controlled through the FastLED.h library. The possibilities of what you can create with it are only limited by your imagination. There were 4 stages to the reveal build up 1. Lightning Every LED has 50% probability of turning on or off. Random delay between 10 and 100ms before all LEDs are turned off Random delay between 10 and 100ms before we repeat