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Motion Detecting Workstation

Motion Detecting Workstation

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Motion Detecting Workstation

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  1. Motion Detecting Workstation Theodore Shinners Kevin Schmitz University of Iowa: Embedded Systems Spring 2011

  2. Hardware Overview • Four Motion Control Sensors • Three Solid State Relays spliced in extension cords

  3. Zilog ZMOTION Detectors

  4. Zilog ZMOTION Detectors Cont • Pins 1,8 are GND • Pins 2,7 are Vcc: Device Uses 3.3V. • Required a simple step down from the 5V output • Used a Sharp voltage regulator • Pin 6 is not used, set to Vcc • Pin 5 is the output, pulled low with motion • Pin 4 is analog input for sensitivity, set to 1.4 V for medium sensitivity • Pin 3 is analog input delay, set to .2V for a 5 sec signal

  5. Solid State Relay

  6. SSR Continued • SSR has 5V control and 5A 240 VAC/VDC load • Standard 3 wire extension cords were cut apart • Relay was soldered on the live wire • Output from circuit above wired to control • When the MCU output pin for associated relay goes high whatever is plugged into the extension cord is turned on

  7. Software Overview • Four motion sensors inputs to MCU • All pulled up, when one goes low: • Determine what sensor was tripped • Look for any patterns • Determine the current output state of associated relay output • Change the output accordingly • Constant Sampling for motion, delays once found

  8. Software Example • pin = PINC;    pin = pin & 0b00001111; //read in inputs    if(pin != 0b00001111){ //if a sensor is low        //Sensor 1        if(pin == 0b00001110){ //if it is the first sensor        _delay_ms(2000); //wait and look for the         pin = PINC; //”all on” condition         pin = pin & 0b00001111;  if(pin == 0b00000000){      temp2 = 0b00111000; //three output pins will be on        }       

  9. Software Example Cont. • else{        temp = out & 0b00001000; //otherwise only deal with the 1st relay            if(temp == 0b00001000){                temp2 = out & 0b00110000;         //if on turn off               }            if(temp == 0b00000000){                temp2 = out | 0b00001000;         //if off turn on            }        }        out = temp2; //send the output        PORTB = out;        _delay_ms(5700); //wait for delay to run out            } //end sensor 1

  10. Motion Description • 4 Motion Detectors Placed Horizontally across a board with line of sight focused with a physical shield • Detectors 1-3 individually control output hardware • 4th detector controls output hardware components 2 and 3 • 1st motion is to simply wave your hand over a sensor • One pass over the sensor will turn the component on • The next will turn it off

  11. Possible Motions • 2nd motion is to wave your hand from left to right across all 4 sensors. • This will turn on all 3 output hardware components • 3rd motion is to wave your hand in the opposite direction across all 4 sensors. • This will turn those same components off

  12. Real World Applications • Reduction of Power Consumption • Lighting Control • Limited Mobility Assistance • Personal Use, plug in anything • User Interfacing, motion control on desktop PCs, etc

  13. Possible Improvements • Program More Motion Patterns • ie (3,2,1,4 makes all devices blink on and off) • Improve Software to avoid problems with long delays from motion controls • Additional output hardware • Workstation can control anything powered by an outlet