Battery-Free Energy-Harvesting Holiday Card Unveiled
2024-12-14
In 2024, Jeff Keacher, Sean Beever, and Sophie created a battery-free electronic holiday card. This ingenious card cleverly harvests ambient radio waves and light energy (not from a traditional solar panel) to power its LEDs and is remotely controllable via a 2.4 GHz WiFi network. Designed for maximum power efficiency, it averages just 400 nanowatts of power consumption and can even be powered by the RF energy leaked from a microwave oven.