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--- en:exercises:ui [2015/11/02 10:24] – raivo.sell
+++ en:exercises:ui [2020/07/20 09:00] (current) – external edit 127.0.0.1
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-~~PB~~
+<pagebreak>
 ====== Exercises ======
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   - This simulates standard traffic light for cars.
-  - This simulates manually operated traffic light at pedestrian crossing. Until no button is pressed a green LED is lit for the cars. After pressing a button the green LED will start to blink for 3 seconds, this is followed by lighting the yellow LED for 3 seconds and red for 10 seconds, after this sequence a green LED is lit again. When red LED is on, the 7-segment display countdowns seconds until green LED starts.
+  - This simulates manually operated traffic light at pedestrian crossing. Until no button is pressed a green LED is lit for the cars. After pressing a button (S1) the green LED will start to blink for 3 seconds, this is followed by lighting the yellow LED for 3 seconds and red for 10 seconds, after this sequence a green LED is lit again. When red LED is on, the 7-segment display countdowns seconds until green LED starts.
   - This counts how many times the button is pressed. The result is displayed by blinking of the LEDs. After each pressing the number of blinking is increased by one. A random button can be selected. In order for the LED to blink a sub function must be used, with parameters set on the number of blinks.
   - Present numbers in hexadecimal system randomly on the 7-segment display. The frequency is 1 Hz.
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 ===== For advanced =====
-  - Vajutades nuppe järjekorras S3 – S2 - S1, süttib roheline LED. Kõigi teiste kombinatsioonide korral süttib punane LED. Iga nupuvajutuse korral vilgatab kollane LED, mis kinnitab nupule vajutust.
+  - When pressing buttons in sequence S3 – S2 - S1, green LED will lit. All other combinations results red LED. Every button press a yellow LED will blink.
   - There is one button for each LED. The controller blinks LEDs randomly and the user has to repeat the same sequence. The sequence of blinks gets longer – one random LED is added with a new round. The sequence is controlled after each user. The time gap between each entry is two seconds. In case of  an incorrect entry all LEDs blink three times. (The number of correct entries by the user may be displayed on a LCD screen).
   - Light in circular sequence 6 outside segments on the 7-segment indicator with the period of 500 ms.
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   - Why are pull-up resistors used in switches? How is their resistance determined?
   - Calculate the resistance for regulating LED current, the voltage is 5 V, forward voltage of the LED is 2,7 V and the current is 30 mA.
-  - How many pins uses the 7-segment number-indicator (with point segment), if it is connected directly to the controller? How many pins would be needed if if were controlled through the driver (driver - A6275)?
+  - How many pins uses the 7-segment number-indicator (with point segment), if it is connected directly to the controller? How many pins would be needed if if were controlled through the shift register 74HC595?
-  - What determines the brightness of the 7-segment number-indicator? How can it be adjusted if the number-indicator is controlled a)directly b)through the driver (driver - A6275)?
+  - What determines the brightness of the 7-segment number-indicator? How can it be adjusted if the number-indicator is controlled a)directly b)through the shift register 74HC595?
   - How can the numbers in decimal system be converted to binary system (to text) and vice versa?
   - How is monochrome (black and white)LCD different from color LCD?

en/exercises/ui.1446459843.txt.gz · Last modified: 2020/07/20 09:00 (external edit)