Yet Another Smartwatch Project

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Presentation given to the Stockholm Internet of Things meetup about my smartwatch hobby project.

Transcript of Yet Another Smartwatch Project

  • 1. Yet Another Smartwatch My latest hobby project Erland Lewin

2. Erland Lewin Computer Science KTHVC-backed startup Voxi doing Speech Recognition & Language UnderstandingLicentiate degree in Biological PhysicsCurrently at Avalon Innovation, Consultant, System DesignerHobby electronics since a couple of yearsFamily, two kids 3. Wristwatch project Watches are cool Low Power Small size Engineering challenge 4. Sharp Memory LCD 5. Components 6. Components (23 tabs) 7. BOM cost @ 100 = 270 SEK, @1=344 8. Schematic 9. ProcessorPIC XLPEnergy MicroNordic Semiconductor 10. PCB Layout 11. Nordic Semi nRF51822 ARM Cortex M0 coreLow power (2 A sleep)30 SEK @ 1, 20 SEK @ 100 (10 SEK more than ATMega) Reasonable Dev kit (700 SEK)Pin mappingGreat supportNorwegian !?Bluetooth Low Energy Realtime Counter 256 kB Flash, 16 kB RAM 12. BLE / iOSLow powerNo Special LicenseApple Notification Center Service (ANCS) built iniPhone 4S and later 13. Low Power Design Low voltage!Frequency not so importantThink Power, not CurrentLeakage Battery self discharge, max currentTheory and practiceDesign shunt resistorsSleep woken by interrupts 14. RadioAntenna affected by everythingCertificationNetwork Analyzer (100 kSEK?) 15. The Road Ahead Review Schematic, LayoutOrder boards, PartsLearn BLE, program softwareSolder boardsDesign case, 3D print...Profit! ;-)