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  • 03.11.2026
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F91 Kepler completed build showing the Casio case fitted with glowing blue OLED display
amateur radio open source Technology

F91 Kepler: Turning a $20 Casio F-91W Into a Bluetooth OLED Smartwatch

9M2PJU 03.11.2026

PegorK's F91 Kepler guts a classic Casio F-91W and rebuilds it around a TI CC2640…

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