The Ollee Watch features an ARM Cortex-M4/M0+ low-power processor with support for Bluetooth Low Energy and a programmable NTAG213 NFC tag (although this is said to only be compatible with the F-91W ...
The DIY version of the Ollee Watch one, which requires you to already have one of six different supported Casio watch models ...
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+ ...
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