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The fan usually stops directly or nearly in front of the person, as desired. Unfortunately fans do not have very efficient or useful features when it is desirable to change the direction of air flow. We do our best to provide accurate documentation of all aspects of the project and the results in this report.

The circuit is heavily based on the circuit provided in the datasheet for the DB sensor: It can operating with 2 wirepackage. We decided to use a half-step 8 step sequence to operate our stepper motor. Task 2 When the single human tracking setting is on, this task is signaled when an external interrupt on pin int1 is detected. This was necessary to stop wires from xatasheet tangling together.

Applicable Standards We used a standard PIR motion detection circuit which we adjusted for our purposes.

Two additional pointers were created whose purpose was to store information about the motor sequence. The fan can rotate back and forth at a set angle which is approximately degrees. The task begins by reading the value of the push-button, which is active low. This low to high transition is captured by the microcontroller and system operation begins. This also daatasheet the fan to track the person again dataaheet they were not detected previously.

PIR DB Datasheet

With special noise immunity techniqueM is the most stable PIR controller you can find on thepackage. We used the safest practices possible in the construction of our platform.


The drivers contain datasneet to protect the circuitry from high voltage spikes by directing the current through the power supply. It requires physical effort which may be difficult if the fan is d203g or the user is of elderly age. Upon detection, the output of the comparator remains high for as much as 2.

PIR sensor Field of View. The standoffs are mounted on a lazy Susan. It was modified to serve our project purposes.

We received professional training before using automatic saws. When the device is triggered current flows through the BJT and a signal voltage proportional to the amount of current is produced.

Senba Sensing Tech DB – PDF Datasheet – Infrared Sensors In Stock |

Previous 1 2 Later this new information will be used by the timer to rotate the motor in the proper direction. Caution should be observed when using a fan connected to the power lines. The output of the integrator is fed into the comparator which we adjusted to obtain the best sensitivity we thought made the system operate best. To separate the stepper motor from the microcontroller we used 4N35 optoisolators.

This can damage the digital circuitry in the microcontroller. A standard circuit application was used to detect a person. This generates an interrupt that signals a task to either stop d203g redirect the motor, depending on the setting.

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Task 6 This task makes sure that the fan can only rotate at an angle of degrees to avoid an unsafe situation such as tangled wires. No abstract text available Text: When the strips of metal touched, the pin was set low and detected by the d203.

On the other hand, the task may have been signaled by the sensor on the left while the motor was rotating counter clockwise. If the debouncer does in fact detect that a button was pushed it toggles the fan setting between 3 modes.


This degrades system performance for reasons that are explained later. Fans usually provide two options for directing airflow: Pages People more options. In addition, neither of us had air conditioning.

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. We recommend that those who work with wood wear safety glasses, act cautiously, and adhere to safety standards.

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. D230b addition, the sensing distance is quite good and can be up to 3 meters. The two PIR sensors are separated in the middle.

This pin is connected to the sensor on the left. Our code uses a real time kernel, called Tiny Real Time, to run processes. Timer 0 Overflow Interrupt The interrupt service routine for this interrupt is entered each time Timer 0 overflows. When the single human tracking setting is on, this task is signaled when an external interrupt on pin datawheet is detected.

(PDF) D203B Datasheet download

This task is a debouncer for the push button on the development board. The motor remains static. This is because they produce a high voltage spike when the current flow through them suddenly changes.

One for the structure containing the next step in the sequence and the other for a structure containing the previous step in the sequence. The second option is wasteful as the fan may direct air at empty spaces for much of the rotation cycle. The PIR sensors measure infra-red light that is radiated in their field of view.