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Wireless Car Breathalyzer Ignition Lock System

Wireless Car Breathalyzer Ignition Lock System. Matt Lorch & Joshua Fajardo-Frink. At A Glance. Two Device System. Breathalyzer Transmitter. Receiver & LCD Interface. Major Components. From HANWEI ELETRONICS CO.,LTD. Alcohol Gas Sensor MQ-3. Analog Biometric Sensor

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Wireless Car Breathalyzer Ignition Lock System

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  1. Wireless Car Breathalyzer Ignition Lock System Matt Lorch & Joshua Fajardo-Frink

  2. At A Glance Two Device System

  3. Breathalyzer Transmitter

  4. Receiver & LCD Interface

  5. Major Components

  6. From HANWEI ELETRONICS CO.,LTD Alcohol Gas Sensor MQ-3 Analog Biometric Sensor * “Fast response” and High sensitivity * Stable and long life * Simple drive circuit

  7. Code Snippets” • void initADC(void) { ADCSRA |= (1 << ADPS2) | (1 << ADPS1) |(1 << ADPS0);// Set ADC prescalar to 128 - 125KHz // Set ADMUX Register// Makes AVCC the ADC reference val.ADMUX = 0b01000000;//Use ADC0 (No MUX adjustment required) ADCSRA |= (1 << ADATE); // Set ADC to Free-Running mode ADCSRA |= (1 << ADEN); // Enable ADC ADCSRA |= (1 << ADSC); // Begin A2D conversions} • For grabbing all 10 bits:Long bob = (ADCH << 8) | (ADCL); // store all 10 bits from ADC ADC Initialization

  8. Impaired BAC ADC Value 0.00 BAC Data Graphing Sample ADC Value Sample

  9. From HANWEI ELETRONICS CO.,LTD XBee® Radio An Elegant and Effective Wireless Solution * UART for Easy Data Transfer (256kps Transfer Rate) * Uses 2.4Ghz Frequency Band *Range of 100 ft. in doors. * Low Power Consumption * Runs on 2.4-3.4V

  10. Code Snippets” • Dash Unit Continuously Listens for Characters in RX • Standard UART with 8 Bit Data, No Parity, & 1 Stop bit • Baud Rate Set to 9600 • Characters Used as Commands: • ‘ ; ’ – Clear LCD & Allows Characters to Write to LCD • ‘ * ’ – Runs Ignition Unlocking for Short Time • ‘ / ’ – Stops Displaying Characters on LCD Receiving Data

  11. Time for a Demonstration! It’s just mouthwash.

  12. Rental Cars • Truck Drivers • Court Orders Marketability

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