Medium Surface Transducer with Wires - 4 Ohm 3 Watt Brand_CamJam It has expanded to be

It has expanded to be useful as a microcontroller multitool

You just stick the inconspicuous black PCB into your plant's soil with a CR2032 battery in it

Dimensions w/ Components: 41mm x 19mm x 7mm

essentially

It also can be put into "dot clock mode" for raw TTL signal in but we have never done this ourselves so there's no example code for that

Medium Surface Transducer with Wires - 4 Ohm 3 Watt Brand_CamJam It has expanded to beTurn any surface wall table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a small metal rod is wrapped with the voice coil. When current is pulsed through the coil, the magnetic field causes a piece of metal to expand and contract and if it's pressed against a surface it turns the transducer into a speaker! Often these size transducers are pressed up against a