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- 1. Sense-It Juan Soto, Anthony Hargrove | Prof. Don Estreich | Rob Gee | Sonoma State University Assistance from: Aaron Marquez, Nick Alvarez Campus Navigation Arriving at a new campus can be daunting. For those who are visually impaired, it can be nearly impossible to navigate without assistance from others. Solution By placing compact RF devices near doorways or unique points of interest, visitors can use their mobile devices to locate each iBeacon to aid in their navigation. Project Overview Construction PCB Fabrication • Copper etching process • Surface mount components applied using a solder paste over hot plate • Terminals added by hand using iron and drill press PIC Configuration • Dual-UART model chosen for flexibility • Code written in XC32 (C derivative) • Extra I/O for future peripherals Bluetooth Configuration • Interfaced through AT commands using serial terminals • Care must be taken when considering orientation and grounding Materials Materials (detailed list) Quantity (be specific) Bluetooth Module (HM-11) 2 per Wall Unit / 1 per Handheld PIC32MX270F256b 1 per Unit iOS Device 1 per User Wall Mounts 1 per Location Handheld Enclosure 1 per User 3.7V Battery 1 per Unit Procedure Download campus info from App Store Update Select points of interest from pull down Customize When within close proximity of location, notification occurs Notify Download any available location info from beacon Inquire Data / Observations • At 0dBm power, module pairs beyond 275 feet. Reducing power output to -24dBm reduces range to approximately 200 feet. • No null spaces discovered within 15 feet of beacon. • Through floor signal reception is very low. • Signal through doors and walls is strong but diffused. • iOS response to Beacons is prompt and may be tuned to distances. Typical RF Pattern Conclusion • Our measurements have shown that we can reliably notify our users of relative proximity. • Attenuation due to objects like bodies will likely hinder the effectiveness for use as a navigation device. Future Work • Mapping through triangulation • Android integration • Professionally produced multilayer boards could permit much smaller devices • Upgrade to dual-mode Bluetooth modules Thanks To We would like to give thanks to Sonoma State for recognizing our project and funding it through the SOURCE Awards program. Sonoma State Engineering Department for their assistance throughout. Nick Alvarez and the MESA program at SRJC. Special thanks to Prof. Don Estreich for believing in our project and providing us with assistance along the way.Numerous environments were chosen to characterize the RF pattern Electrical Engineering