In a recent article in Elektor magazine, [Clemens Valens] describes the construction and software for an ESP32 walkie-talkie ... The DIY Walkie-Talkie circuit diagram. (Credit: Clemens Valens ...

The heart of the system is a 3D-printed mechanism that holds a bottle of fish food in a funnel and dispenses a set amount through a servo-operated shutter. The servo is driven by an ESP32 sitting ...