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High Level Design Rationale and sources of the project idea: The motor remains static.
Senba Sensing Tech DB – PDF Datasheet – Infrared Sensors In Stock |
Timer 0 Overflow Interrupt The interrupt service routine for this interrupt is entered each time Timer 0 overflows. The rotation is clockwise if the left sensor has detected a person or counter clockwise if the right sensor has detected a person. Ganesh Raaja AssociatedThis Application Note describes a complete proximity sensing application using a PIR motion sensorprocess the signal from a PIR Pyroelectric Infrared motion sensor and detect the presence of objectsporch light or dqtasheet a door.
The PIR sensors measure infra-red light that is radiated in their field of view.
daasheet The lazy Susan was connected to a pin on the development board with an activated pull up resistor. With special noise immunity techniqueM is the most stable PIR controller you can find on darasheetpackage. The second option is wasteful as the fan may direct air at empty spaces for much of the rotation cycle. On the other hand, if the motor was rotating counter clockwise then the motor is stopped to direct air flow at a person for half a second and then begins rotating clockwise toward the second person.
Because our project includes the use of a high voltage fan, at all times, testing with a fan was done while both members were present.
Caution should be observed when using a fan connected to the power lines. The main sources are electrical equipment in the lab closely situated by the PIR sensors. This information will be used by the timer to rotate the motor in the proper direction. The platform, using dual element Pyroelectric Infrared Sensors PIR sensors, rotates itself independently to direct air flow to whatever position a person moves to.
Not too slow to avoid a large waiting time and not fast to minimize detection misses. We received professional training before using automatic saws. We have posted material that we believe is important, useful, and informative to the readers. datasheft
This task makes sure that the fan can only rotate at an angle of degrees to avoid an unsafe situation such as tangled wires. PIR sensor Field of View. On the other hand, the task may have been signaled by the sensor on the right while the motor was rotating clockwise.
When the single human tracking setting is on, this task is signaled when an external interrupt on pin int0 is detected. Thus, we decided to minimize these changes as much as possible. Our project idea and design is our own.
This also allows the fan to track the person again if they were not detected previously. Our code uses a real time kernel, datasueet Tiny Real Time, to run processes. When the PIR output meets certain criteria see functional.
More than thisthere are fewconditionally. The circuit is heavily based on the circuit provided in the datasheet for the DB sensor: We decided to use a half-step 8 step sequence to operate our stepper motor.
When the motor spun counter clockwise the pointer forwardPtr pointed to the current step, while the pointer reversePtr pointed to the previous step. Previous 1 2 The system cannot respond until the sensor output settles since a rising edge is required to trigger a new response from the d203g. Furthermore, ULN drivers are used to supply the high current needs of the motor since the microcontroller has a maximum current dayasheet of 40mA.
(PDF) D203B Datasheet download
If the task was signaled at a time that the platform was stationary, or in other words when the variable motorDirection was equal to stop, the task sets the variable motorDirection to clockwise. Task 4 This task is the dual of Task 3. As discussed previously, upon detection of movement, the PIR circuit output for each sensor goes high.
This was necessary to stop wires from possibly tangling together. TRIAC can be either shunt or serial connected. Applicable Standards We used a standard PIR motion detection circuit which we adjusted for our purposes. External Interrupts on Sensors As discussed previously, upon detection of movement, the PIR circuit output for each sensor goes high.
If upon entrance into the ISR the value of the variable motorDirection was equal to counter clockwise, PORTA of the development board is set to a motor step to drive the motor. Motors need to be isolated from the AVR. We placed an O-ring around the standoffs and the motor shaft to increase the gear ratio, slow down the platform rotating speed, and produce more torque.
Although we experience cold weather for much of the Fall and Spring semesters when at Cornell, we have both lived in regions where the temperature and humidity is very high.
Thus, we decided to focus on a project that could solve the daily stresses and inconveniences of fan use by automating the process. We recommend that those who work with wood wear safety glasses, act cautiously, and adhere to safety standards. The rotating platform can be seen in Figure 2.
The 8 step sequence not only slows down the motor but also allows more accurate positioning of the platform. The sensors can be seen in Figure 3. The motor is controlled using an 8-step sequence to halve the rated step angle.