ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Preliminary Design Review Team Wireless Nothing Team members Derek Lindberg Sean McDevitt Nick Ciocco Eric Hoffman Chris Browne Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 What is this Device Two way wireless communication between to separate motorcycles One way wireless CD quality audio streaming from a portable device s audio jack Adjustable volume microphone gain and channel selection Restricted access to broadcasted audio Modular implementation of a wireless communication and audio listening device Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 High Level Concept Short range RF Long Range RF Short range RF Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Functional Block Diagram Headset Microphone Microcontroller Headphones I2 C ADC Codec DAC Codec I2C Bus I2 S I2 S Transceiver Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 Transceiver ADC DAC OR Transceiver I2S Receiving Transceiver Transceiver I C 2 Microcontroller Preliminary Design Review Single Chip Wireless Transceiver nRF24Z1 2 4 GHz operating frequency Low cost Low power High fidelity sound 16 bit Channel selection Integrated control channel 1Mbit s 4Mbit s Data Rate I2S or S PDIF Audio Input 16bit SPI or I2C Integrated Frequency Hopping Scheme Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 Antenna Considerations 2 4 GHz Printed Monopole Size 23cm x 1 5mm 2 4 GHz Chip Antennas Size Tiny 1cm2 Reduced gain from reduced size 2 4 GHz Printed Whip Monopole Size 12mm x 20mm Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 Functional Block Diagram Headset DAC ADC Microphone Microcontroller Headphones I2 C ADC Codec DAC Codec I2C Bus I2 S I2 S Transceiver Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 DAC ADC Microphone Headphones MP3 Player Analog DAC ADC I2C Single Chip DAC ADC I2S Codec Convert between analog and I2S Low power low cost High quality 16 bit sound DAC and ADC in single chip for simplicity Integrated gain control volume control and speaker drivers if possible I2S communication to Transceiver I2C control from Microcontroller I2S Microcontroller Transceiver Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 Functional Block Diagram uC Microphone Microcontroller Headphones I2 C ADC Codec DAC Codec I2C Bus I2 S I2 S Transceiver Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 Microcontroller Microcontroller I C 2 Transceiver s ADC DAC Primary Functions Timing Control power consumption User feedback tones battery level Process user input buttons Microcontroller MSP430F156 Features 24kB Flash 1024B RAM Very low power 330uA active 1 1uA standby mode 12bit DAC I2C and SPI interfaces in hardware 48 IO pins Overkill but we will never have to worry about exceeding code space or having too few IO pins during dev Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio State Diagram Headset Base Station Search ice R ket Pac Wait Idle Wa keOn Vo Init Base Station Found Pa ck et Tx Always Tx d co De et ck Pa ed Preliminary Design Review d ive ece Wait Rx Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 High Level Concept Short range RF Long Range RF Short range RF Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Functional Block Diagram Base Station Microcontroller I2 C Base Station to Helmet Transceiver I2C I2S Bus Base Station to Other motorcyclist Transceiver Preliminary Design Review Base Station to Audio Device Transceiver Serves as a booster for the helmet s voice communications Receives voice from helmet and retransmits with larger gain Receives voice communication from other motorcyclist s and transmits them to the helmet Given input from helmet switches between voice communication and music Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Vo ice Tim Au eou Au dio t w dio o Pre Dev sen ice t State Diagram Base Station Always Headset Search e vic De dio nt Au Prese Wait Idle Wait A No io ud n ese Pr t Preliminary Design Review Local Audio Handmade by Robots Voice Timeout Init Headset Found Voice Detected Remote Tx Rx ECEN 4610 Hands Free Low Profile Wireless Radio Spring 2006 High Level Concept Short range RF Long Range RF Short range RF Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Functional Block Diagram Media Device Media Device Microcontroller Analog I2C ADC Codec Transmits streaming wireless audio from a portable device such as an mp3 player Audio is played back in the helmet Has a lower priority than voice comm Same PCB as Helmet headphone portion left unpopulated Simplifies Design Single circuit to debug I2C Bus I2 S Transceiver Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio State Diagram Media Device Always Init Base Station Found Base Station Search Wait Preliminary Design Review Idle Wait Audio Levels Present Remote Tx Audio Timeout Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Highly Modular Design Wireless Audio Transmitter Base Station Headphone Mic Audio Codec Tx Rx Audio Codec Tx Rx uC Tx Rx uC uC Tx Rx Audio Codec Tx Rx Each component is composed of several re useable modules We only need to do low level design and testing once Preliminary Design Review Handmade by Robots ECEN 4610 Spring 2006 Hands Free Low Profile Wireless Radio Division of Labor Team members Responsibility Derek Lindberg Hardware layout and assembly firmware programming Sean McDevitt Antenna and Transceiver design Nick Ciocco Transceiver design and PCB layout overview Eric Hoffman Hardware layout and assembly firmware programming Chris Browne Assembly firmware programming hardware integration Group Responsibilities Documentation system development integration system testing and documentation Preliminary Design Review Handmade by Robots ECEN 4610 Hands Free Low Profile Wireless Radio