Transcript Motion Detecting Workstation

Motion Detecting Workstation
Theodore Shinners Kevin Schmitz
University of Iowa: Embedded Systems
Spring 2011
Hardware Overview
• Four Motion Control Sensors
• Three Solid State Relays spliced in extension
cords
Zilog ZMOTION Detectors
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
Solid State Relay
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
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
Software Example
• pin = PINC;
pin = pin & 0b00001111; //read in inputs
if(pin != 0b00001111){
//Sensor 1
if(pin == 0b00001110){
//if a sensor is low
//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
}
Software Example Cont.
•
else{
temp = out & 0b00001000;
//otherwise only deal with the 1st relay
}
if(temp == 0b00001000){
temp2 = out & 0b00110000;
}
if(temp == 0b00000000){
temp2 = out | 0b00001000;
}
out = temp2;
PORTB = out;
_delay_ms(5700);
} //end sensor 1
//if on turn off
//if off turn on
//send the output
//wait for delay to run out
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
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
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
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