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| en:exercises:ui [2015/11/12 13:07] – heikopikner | en:exercises:ui [2020/07/20 09:00] (current) – external edit 127.0.0.1 | ||
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| ====== Exercises ====== | ====== Exercises ====== | ||
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| - 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? | ||
