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When the strips of metal touched, the pin was set low and detected by the microcontroller.

pir db datasheet & applicatoin notes – Datasheet Archive

The interrupt service routine for this interrupt is entered each time Timer 0 overflows. As far as we know there are no legal restrictions on our project. Although the sensors almost always detect humans, other sources of heat, especially in the lab, will occasionally trigger the sensors as well. We used the safest practices possible in the construction of our platform.

We spent much of our time attempting to change certain circuit parameters to achieve an optimal circuit performance. We decided to block the negative datasheett with tape to increase the sensors sensitivity.

Unfortunately fans do not have very efficient or useful features when it is desirable to datassheet the direction of air flow.

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Caution should be observed when using a fan connected to the power lines. However, since our usual testing environment was in a lab full with people, computers, monitors, and oscilloscopes, we did suffer some confusion as to which sources of heat were triggering the sensors.


Task 2 When the single human tracking setting e203b on, this task is signaled when an external interrupt on pin eatasheet is detected. High Level Design Rationale and sources of the project idea: Our project did not interfere with other designs as far as we know.

The circuit biases the sensor output and integrates it. It can operating with 2 wirepackage.

(PDF) D203B Datasheet download

On the other hand, the task may have been signaled by the sensor on the left while the motor was rotating counter clockwise. The platform is mounted on four standoffs.

The schematic can be seen below. This pin is tested by the task every 50 msec. Our platform was constructed from wood and thus required use of sharp tools. The PIR sensors measure infra-red light that is radiated in their field of view.

The platform rotates and stops properly most of the time. In addition to the PIRa temperature sensor monitors the outside temperature and inhibits the lampsPIR detects any further movement.

The motor is controlled using an 8-step sequence to halve the rated step angle. Installation is simple and once installed is relatively maintenancethe unit. The lazy Susan was connected to a pin on the development board with an activated pull up resistor. Mainly, the sensor output is high for a very long time, thus delaying the response of the system. On the other hand, the task may have been signaled by the sensor on the right while the motor was rotating clockwise.


The drivers contain diodes to protect the circuitry from high voltage spikes by directing the current through the power supply. Legal Considerations As far as we know there are no legal restrictions on our project. This is sufficient to lag a little behind quickly moving people but the fan stops once it reaches its correct destination. Once we realized this we in fact managed to solve many problems using software.

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

PIR sensor Field of View. This was necessary to stop wires from possibly tangling together. If the motor was stationary before the task was signaled, this task sets the global variable motorDirection to clockwise.

The fan is static and needs to be physically redirected to direct air in the desired direction.

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