Today's Mini Test

Here are today's mini test answers:


1. What shape of box would you use to control an output in a flowchart?

 

 
2. What does the % sign mean? That the following number is in binary
3.a) Label the most significant bit: 10101010 (MSB is in red)
  b) Which pin number is this? 7
4. a) What method of speed control do you have to use with a microprocessor? PWM - Pulse Width Modulation
    b) Draw a graph to show a fast speed labeling the mark and space See the green graph below.
    c) How would you alter this to make the motor turn slowly? Increase the space so that the mark to space ratio changes.  The bigger the space the slower the motor will turn.
5. What is the value, in volts, of a "high" signal? 5V
6. What is b0? A memory file in the RAM where information can be stored whilst the program runs i.e. how many times a sequence has been repeated.
7. What is the name for the wires connecting the ROM to the ALU? The Program Bus
8. What connects the microcontroller to the "real world"? The I/O Port Input Output port
9. What unit of time does the microprocessor count in? Milliseconds (ms)
10. Draw a system diagram for a street lamp which will come on automatically at night.

(I would accept "dark" as the real life input and "dark sensor" for the input transducer.)

You must show all the parts of the system in separate boxes with a system boundary around them, then real life inputs/outputs are not in boxes and outwith the system boundary.

Please leave a comment stating what part of today's test you found most difficult so that I can target my feedback to suit.