Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| en:exercises:ui [2015/11/02 10:25] – raivo.sell | en:exercises:ui [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ~~PB~~ | + | < |
| ====== Exercises ====== | ====== Exercises ====== | ||
| Line 11: | Line 11: | ||
| - This simulates standard traffic light for cars. | - 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 |
| - 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. | - 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. | - Present numbers in hexadecimal system randomly on the 7-segment display. The frequency is 1 Hz. | ||
| Line 38: | Line 38: | ||
| - Why are pull-up resistors used in switches? How is their resistance determined? | - 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. | - 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? | + | - What determines the brightness of the 7-segment number-indicator? |
| - How can the numbers in decimal system be converted to binary system (to text) and vice versa? | - 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? | - How is monochrome (black and white)LCD different from color LCD? | ||
