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In this issue

Theme: Wireless Communications 06 : PRODUCT NEWS 09 : CLIENT PROFILE EzPCB (Shenzhen, China) 10 : EDITORS' PICKS Wireless Communications Several of the Circuit Cellar team’s favorite articles on wireless-related topics 17 : Full-Stack Python Rapid Embedded Hardware and GUI Development By Matt Oppenheim Use Micropython to develop a platform for wirelessly measuring and recording hand gestures 26 : Rectifying an A/D Conversion Error By David Ludington A solution to an error that has been spreading throughout the “maker” community 30 : Virtual Keyboard Design By Vitchyr Pong and Gulnar Mirza How to design and build a microcontroller-based virtual keyboard system 42 : QUESTIONS & ANSWERS The Pi Maker An Interview with Eben Upton By Wisse Hettinga The inventor of the Raspberry Pi on the development of the tiny computer and the future of the Foundation 46 : THE CONSUMMATE ENGINEER Electrical Power Converters (Part 2) TRIAC and Thyristor Applications By George Novacek A look at TRIAC and thyristor applications in phase control, zero crossing triggering, and more 50 : EMBEDDED IN THIN SLICES Build and Embedded Systems Consulting Company (Part 2) More Core Values By Bob Japenga Four more core values that are essential for running a successful embedded systems consulting company 54 : THE DARKER SIDE Impedance Matching Fundamentals By Robert Lacoste A primer on impedance matching for engineering pros and electronics enthusiasts alike 62 : FROM THE BENCH Real-World Mapping (Part 2) GPS Data By Jeff Bachiochi Why logging GPS data matters and what you can expect in terms of accuracy 70 : CC REBOOT Wireless Authentication RFID Checkout System Design By Jigar Shah and Kevin Yang A review of wireless authentication, RFID tag structure, antenna tuning, and more 76 : CROSSWORD 77 : TEST YOUR EQ 80 : The Future of Wireless Technology Six innovators share their thoughts on the future of wireless

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