D203B DATASHEET PDF
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(PDF) D203B Datasheet download
We decided to use a half-step 8 step sequence to operate our stepper motor. The main sources are electrical equipment in the lab closely situated by the PIR sensors. MoreAdjustable light on duration.
The purpose of this report is to share the information we have obtained from our experimentation and testing. 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.
Thus, motion outside this field of view will most likely not be detected. One for the structure containing the next step in the sequence and the other for a structure containing the previous step in the sequence. It was modified to serve our project purposes. Our project idea and design is our own. When the single human tracking setting is on, this task is signaled when an external interrupt on pin int0 is detected.
Our platform was constructed from wood and thus required use of sharp tools. The circuit is heavily based on the circuit provided in the datasheet for the DB sensor: They can be seen in Figure 1 below.
The fan is static and needs to be physically redirected to direct air in the desired direction.
As discussed previously, upon detection of movement, the PIR circuit output for each sensor goes high. Previous 1 2 A standard circuit application was used to detect a person. Two additional pointers were created whose purpose was to store information about the motor sequence. They each contain two internal compensating pyro electric windows, one positive and the other negative, to minimize disruption from sources such as temperature variation. 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.
If the motor was stationary before the task was signaled, this task sets the global variable motorDirection to counter clockwise. The kernel API was introduced in class for our 4th lab. In addition, the sensing distance is quite good and can be up to 3 meters. This pin is tested by the task every 50 msec. For our final project we decided to construct a human tracking rotating platform that supports a fan.
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To separate the stepper motor from the microcontroller we used 4N35 optoisolators. To dataxheet hazardous situations such as tangled wires the fan was allowed to rotate at angles that were no greater than degrees. This pin is connected to the sensor on the left. Task 2 When the single human tracking setting is on, this task is signaled when an external interrupt on pin int1 is detected.
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The schematic can be seen below. PIR sensor Field of View. The speed of execution was satisfactory for the most part. Upon detection of a human the sensing circuit responds immediately, causing the circuit output to go high. If the motor was stationary before the task was signaled, this task sets the global variable motorDirection to clockwise.
In addition each structure contained two pointers. Once this is done, and the button datsaheet released, the debouncer waits for a new input again. No abstract text available Text: The two PIR sensors are separated in the middle.
This information will be used by the timer to rotate the motor in the proper direction.
Switching between modes re-initializes all major parameters to their default values and the variable motorDirection is set to stop. Unfortunately, there were some issues with the sensors that were difficult to handle.
On the other hand, if the motor was rotating clockwise then the motor is stopped to direct air flow at a person for half a second and then begins rotating counter clockwise toward the second person. Stepper Motor Control We decided to use a half-step 8 step sequence to operate our stepper motor.
We recommend that those who work with wood wear safety glasses, act cautiously, and adhere to safety standards.
When the motor spun counter clockwise the pointer forwardPtr pointed to the current step, while the pointer reversePtr pointed to the previous step. Unfortunately fans do not have very efficient or useful features when it is desirable to change the direction of air flow.
In addition, neither of us had air conditioning. If the value of the variable motorDirection was set d2203b clockwise, PORTA of the development board is set to a motor step to drive the motor.
The code is available for viewing in the Commented Code section. datawheet
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.
Mainly, the sensor output is high for a very long time, thus delaying the response of the system.