Show HN: Capacitor Alarm Clock
Wake up to a bang with this unique alarm clock that literally blows up capacitors to rouse you from sleep. Inspired by ElectroBOOM, this ESP32-powered DIY project offers web configuration and a detailed build guide. It's presented as a 'high-effort joke' but comes with serious warnings about the explosive and fuming nature of its wake-up call.
The Lowdown
A developer has created a unique alarm clock designed to ensure wakefulness by literally exploding capacitors. Presented as a 'high-effort joke,' the project provides comprehensive documentation for enthusiasts interested in replicating this unconventional device.
- Core Functionality: The alarm clock uses an ESP32-C3 microcontroller, providing time synchronization via NTP, an SSD1315 OLED display, and a web UI for configuration.
- Explosive Mechanism: It features three capacitor slots, each equipped with relays to apply 15V reverse voltage and 5.1-ohm current-limiting resistors, ensuring a spectacular, albeit controlled, explosion.
- Design Quirks: Due to the use of LDOs for voltage regulation, the device also functions as a small heater, a result of a design choice prioritizing simplicity over thermal efficiency.
- Safety First (Mostly): The creator issues a strong warning about the violent nature of capacitor explosions and the unpleasant fumes, stressing that users should proceed only if they know what they're doing.
- Optimization Tips: Detailed advice is given on sourcing capacitors, recommending specific types without pressure release slots and with lower voltage ratings (around 16V) to maximize the 'bang' effect.
- Comprehensive Documentation: The GitHub repository includes PCB schematics, CAD files for the enclosure, and firmware build instructions, making it a well-documented hardware project.
This project stands out as a testament to creative engineering, blending humor with practical (if dangerous) application of electronics, all while offering a complete open-source package for fellow hardware hackers.