Casio's 'F-91W' was released in 1989, and its design has remained almost unchanged since its debut up until the time of writing. Coupled with its impressive cost performance, it's also known as a ...

A few years ago Joey Castillo introduced Sensor Watch, a $35 board designed to fit inside the shell of a Casio F-91W wristwatch, giving a classic watch some modern hardware including an ARM Cortex-M0+ ...