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--- en:exercises:sensor [2015/11/12 12:22] – heikopikner
+++ en:exercises:sensor [2020/07/20 09:00] (current) – external edit 127.0.0.1
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   - Data recorder. The values of all analogue sensors (potentiometer, thermistor, and the photoresistor) are measured constantly and minimum and maximum values are recorded. By pressing button S1 the user may change the information displayed on the LCD. Displayed must be: name of the sensor (shortly) and present minimum and maximum values.
   - UH Distance sensor. If the button number S2 is pressed, 10 sequential measurements are taken place in one second. After measuring the average distance to the object in decimetres it is displayed on 7-segment indicator. By pressing button S1, minimum measured value is displayed and by pressing button S3 maximum value is displayed.
-  - Velocity. According to the changing rate of the distance to the object (as measured by infrared or ultrasound sensor), it is shown with LEDs as follows: slow change – green LED, moderate change – yellow LED and rapid change red LED. The speed may be displayed on the LCD.
+  - Velocity. According to the changing rate of the distance to the object (as measured by infrared or ultrasonic sensor), it is shown with LEDs as follows: slow change – green LED, moderate change – yellow LED and rapid change red LED. The speed may be displayed on the LCD.
-  - Automatic measuring range. According to the current measuring results minimum and maximum temperatures measured are found and correspondingly the range in which the values fit is scaled from  0 to 9. Value is displayed on 7-segment indicator.
   - By combining IR and ultrasonic distance sensors the distance to the object, velocity of the object and direction of the object are determined. Results are displayed on LCD.
+  - Using the acceleration sensor detect the movement of an object and the direction of movement, which is displayed on a stripe with direction of the center of the LCD. The stripe length corresponds to the absolute value of the acceleration.
-~~PB~~
+<pagebreak>
 ===== Questions =====
-  - How accurate is the digital-analogue converter of ATmega2561 microcontroller? How small is the minimal change of input voltage which can be measured?
+  - How accurate is the digital-analogue converter (ADC) of ATxmega128A1U microcontroller? How small is the minimal change of input voltage which can be measured?
   - How long takes one ADC process? How is the operating frequency changed?
   - Which is the the range of input voltage of the ADC? Is it possible to be changed? How?
   - What is the difference between positive temperature coefficient (PTC) thermistor and negative temperature coefficient(NTC)? What are the advantages of each?
   - What is the purpose of a voltage divider in a measuring circuit?
-  - Combine a voltage divider, which allows to use an analogue sensor with ATmega2561 microcontroller. The maximum output voltage of the sensor is 10 V. In addition determine the contents of the ADMUX register.
+  - Combine a voltage divider, which allows to use an analogue sensor with ATxmega128A1U microcontroller. The maximum output voltage of the sensor is 10 V.
   - Extra resistors were added to the potentiometer pins and voltage of 5 V were applied on them. How big must be the resistances of extra resistors and the potentiometer so the regulated voltage on the slider of the potentiometer can be regulated between 1 V and 2 V (from one end to the other end)? The current should not exceed 10 mA.
   - Which parameters of the surroundings have an effect on the functioning of ultrasonic distance sensor and why?
   - Which light sensitive sensors could be used in a robotics project. Count at least three principal components and explain their differences.
   - Besides trigonometrical method, how is distance determined by using light? Name at least 3 methods.

en/exercises/sensor.1447330930.txt.gz · Last modified: 2020/07/20 09:00 (external edit)