A new lesson was posted today:
http://www.pyroelectro.com/edu/fpga/handheld_pov/
Post your homework answers here to compare with everyone else!
#9 Design a Handheld POV [Post Homework Here]
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Re: #9 Design a Handheld POV [Post Homework Here]
The homework looks like the one from lesson8
/Bingo
/Bingo
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Re: #9 Design a Handheld POV [Post Homework Here]
Bingo600 wrote:The homework looks like the one from lesson8
/Bingo



Re: #9 Design a Handheld POV [Post Homework Here]
Seems like the schematic is fixed , but not the homework
/Bingo
/Bingo
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Re: #9 Design a Handheld POV [Post Homework Here]
Bingo600 wrote:Seems like the schematic is fixed , but not the homework
/Bingo
They're all fixed now!
Re: #9 Design a Handheld POV [Post Homework Here]
HOMEWORK QUESTION 1
Modify The ROM in lesson10’s VHDL code, so the POV message will be: HELLO!
I suppose you mean lesson9's ....
Code: Select all
type num_array is array (0 to 31) of std_logic_vector(7 downto 0);
constant led_message : num_array := (
0 => "00000000", --
1 => "11111111", --********
2 => "00010000", -- *
3 => "11111111", --********
4 => "00000000", --
5 => "11111111", --********
6 => "10010001", --* * *
7 => "10000001", --* *
8 => "00000000", --
9 => "11111111", --********
10 => "10000000", --*
11 => "10000010", --*
12 => "00000000", --
13 => "11111111", --********
14 => "10000000", --*
15 => "10000000", --*
16 => "00000000", --
17 => "11111111", --********
18 => "10000001", --* *
19 => "11111111", --********
20 => "00000000", --
21 => "00000000",
22 => "00000000",
23 => "00000000",
24 => "00000000",
25 => "00000000",
26 => "00000000",
27 => "00000000",
28 => "00000000",
29 => "00000000",
30 => "00000000",
31 => "00000000"
);
HOMEWORK QUESTION 2
How would the LED message change, if we used a faster clock signal to the CPLD, from the
555 timer?
I haven't build the pow (blush).
But i'd suppose either :
1: The letters would be narrower , as (with the same hand movement velosity) there is less time where the leds are on.
2: The on time would be so fast so it would look like a blur of red.
HOMEWORK QUESTION 3
What is a good clock frequency to use when building a hand-held POV? Why?
200Hz (5ms) - (video says 5us ... thats a tad fast for 200Hz)
At 200Hz the flicker isn't visible to the human eye.
/Bingo
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