Working with Shift Registers and a PIC help - Page 7 - Electronic Circuits Projects Diagrams Free

Darkstar64 · 7th October 2008, 12:48 PM

There's only 8 bits for this pattern because the inside/center Led is never on basically im just trying to cycle though the outside LED's one at a time on each layer so let me try to explain it better hence the rotation of the string of bits so I only need to have 4-10 lines of code per layer instead of writing the lines for each led to be turned on does this make any sense at all ? I need the rrf to move it so its like this as well there is too examples I used to try to explain it below only one led is on at all times but the rrf is used to move the high bit to the right and then I need something that puts the whole string into temp for it to be shifted out ?

10000000
-moves string into temp for LED 1 to go light up
01000000
-moves string into temp for LED 2 to go light up
00100000
-moves string into temp for LED 3 to go light up
00010000
-moves string into temp for LED 4 to go light up
00001000
-moves string into temp for LED 5 to go light up
00000100
-moves string into temp for LED 6 to go light up
00000010
-moves string into temp for LED 7 to go light up
00000001
-moves string into temp for LED 8 to go light up

-start of code/int
-first led lit on top layer
-delay
-turns off
-second led lit on top layer
-delay
-turns off
-third led lit on top layer
-delay
-turns off
-forth led lit on top layer
-delay
-turns off
-fith led lit on top layer
-delay
-turns off
-sixth led lit on top layer
-delay
-turns off
-seventh led lit on top layer
-delay
-turns off
-eight led lit on top layer
-delay
-turns off
-first led lit on mid layer
-delay
-turns off
-second led lit on mid layer
-delay
-turns off
-third led lit on mid layer
-delay
-turns off
-forth led lit on mid layer
-delay
-turns off
-fith led lit on mid layer
-delay
-turns off
-sixth led lit on mid layer
-delay
-turns off
-seventh led lit on mid layer
-delay
-turns off
-eight led lit on mid layer

skyhawk · 7th October 2008, 01:10 PM

If you are just trying to cycle the LEDs in a layer, why not clock out a one and latch it to light the first LED. After the delay clock out a zero shifting the one in the shift register. Then latch, delay and repeat until the one has been shifted out of the shift register.

OK, I see this won't work if you've cascaded shift registers to get 12 bits of output.

futz · 7th October 2008, 03:44 PM

Quote:

Originally Posted by Darkstar64

There's only 8 bits for this pattern because the inside/center Led is never on basically im just trying to cycle though the outside LED's one at a time on each layer so let me try to explain it better hence the rotation of the string of bits so I only need to have 4-10 lines of code per layer instead of writing the lines for each led to be turned on does this make any sense at all ? I need the rrf to move it so its like this as well there is too examples I used to try to explain it below only one led is on at all times but the rrf is used to move the high bit to the right and then I need something that puts the whole string into temp for it to be shifted out?

OK, now I get what you were ranting about!

What you want to do is do your RRF, then check the carry and change the high bit of the byte you RRFed to match ("move" the bit from the carry to the byte), then get the byte in W (movf rot,w) and store it in temp (movwf temp). Simple.

Quote:

and then I need something that puts the whole string into temp for it to be shifted out?

Once again, a byte is NOT a string. It's a byte.

AtomSoft · 8th October 2008, 02:14 PM

whats a good Shift Register where i can control a MINIMUM of 35 LED's? Today is shopping day lol

EDIT:

Alsot I need another shift register with a minimum of 9 outputs. Any Thoughts?

futz · 8th October 2008, 03:29 PM

Quote:

Originally Posted by AtomSoft

whats a good Shift Register where i can control a MINIMUM of 35 LED's? Today is shopping day lol

Micrel MM5451YN

Quote:

Also I need another shift register with a minimum of 9 outputs. Any Thoughts?

HEF4894B by NXP. It's a 12-stage open drain chip.

AtomSoft · 8th October 2008, 04:26 PM

thanks futz. Ill be sure to add them to the list.

Darkstar64 · 13th October 2008, 01:03 AM

Im a little confused what I think your getting at is first RRF, then test the carry flag, then move the bit in the carry flag to w, then move w too temp ? something like that im a little confused about getting the byte from w and what not ? But other then this I have a few pattern's working right now im soon going to go to the 4x4x4 Cube in hopes of going bigger after that and probably upgrading the PIC

AtomSoft · 13th October 2008, 02:24 AM

im going to try a 4x4x4 in about a week and a month after that ill try a 8x8x8. Thats 512 LEDs. Thats gonna be fun. Maybe (MAYBE) ill try a 16x16x16 or just make a large table top design to go under my table and a clear glass over it and have a moving table

but if i do ill be sure to use multiple (2-RB or 3-RGB) color leds. for a table it would be so nice with PWM control so i can control dimness.

Darkstar64 · 13th October 2008, 02:27 AM

Nice I was going to do the same thing with the table but use some cheap bright red LED's with some motion sensor's/light sensor's to detect when something is placed on the table then light the led's under it something like that but I still need to understand what fuz is talking about haha

AtomSoft · 13th October 2008, 12:07 PM

lol its funny i was going to use a blocked off light sensor like a photo resistor to determine if something is on the table. . The thing is i was goingg to make it look like a ball was bouncing around the table and when ever a object (light is blocked) it wil bounce off that surface.

futz · 14th October 2008, 05:05 AM

Quote:

Originally Posted by Darkstar64

I'm a little confused.

What I think your getting at is first RRF, then test the carry flag, then move the bit in the carry flag to W, then move W to temp? Something like that.

Not "something like that". Almost exactly like that!

Don't actually move the bit in the carry. Just test it and change the high bit to match.

Quote:

I'm a little confused about getting the byte from W and what not?

Why? Seems pretty straightforward.

Quote:

But other then this I have a few pattern's working right now. I'm soon going to go to the 4x4x4 Cube in hopes of going bigger after that and probably upgrading the PIC

I have a much nicer pattern working now and need to get it posted on my site, but the site has been hacked.

Anybody going there should be a bit careful to do a spyware check after visiting. I don't think it's doing anything terribly dangerous or destructive, but be careful anyway.

I'm going to do a full upgrade to the latest Joomla (supposedly much more secure), but it's a ton of work, so I've been putting it off...

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7th October 2008, 12:48 PM	#91
Darkstar64	There's only 8 bits for this pattern because the inside/center Led is never on basically im just trying to cycle though the outside LED's one at a time on each layer so let me try to explain it better hence the rotation of the string of bits so I only need to have 4-10 lines of code per layer instead of writing the lines for each led to be turned on does this make any sense at all ? I need the rrf to move it so its like this as well there is too examples I used to try to explain it below only one led is on at all times but the rrf is used to move the high bit to the right and then I need something that puts the whole string into temp for it to be shifted out ? 10000000 -moves string into temp for LED 1 to go light up 01000000 -moves string into temp for LED 2 to go light up 00100000 -moves string into temp for LED 3 to go light up 00010000 -moves string into temp for LED 4 to go light up 00001000 -moves string into temp for LED 5 to go light up 00000100 -moves string into temp for LED 6 to go light up 00000010 -moves string into temp for LED 7 to go light up 00000001 -moves string into temp for LED 8 to go light up -start of code/int -first led lit on top layer -delay -turns off -second led lit on top layer -delay -turns off -third led lit on top layer -delay -turns off -forth led lit on top layer -delay -turns off -fith led lit on top layer -delay -turns off -sixth led lit on top layer -delay -turns off -seventh led lit on top layer -delay -turns off -eight led lit on top layer -delay -turns off -first led lit on mid layer -delay -turns off -second led lit on mid layer -delay -turns off -third led lit on mid layer -delay -turns off -forth led lit on mid layer -delay -turns off -fith led lit on mid layer -delay -turns off -sixth led lit on mid layer -delay -turns off -seventh led lit on mid layer -delay -turns off -eight led lit on mid layer

7th October 2008, 01:10 PM	#92
skyhawk	If you are just trying to cycle the LEDs in a layer, why not clock out a one and latch it to light the first LED. After the delay clock out a zero shifting the one in the shift register. Then latch, delay and repeat until the one has been shifted out of the shift register. OK, I see this won't work if you've cascaded shift registers to get 12 bits of output. Last edited by skyhawk; 7th October 2008 at 01:14 PM.

8th October 2008, 02:14 PM	#94
AtomSoft	whats a good Shift Register where i can control a MINIMUM of 35 LED's? Today is shopping day lol EDIT: Alsot I need another shift register with a minimum of 9 outputs. Any Thoughts? __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics Last edited by AtomSoft; 8th October 2008 at 02:38 PM.

8th October 2008, 04:26 PM	#96
AtomSoft	thanks futz. Ill be sure to add them to the list. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

13th October 2008, 01:03 AM	#97
Darkstar64	Im a little confused what I think your getting at is first RRF, then test the carry flag, then move the bit in the carry flag to w, then move w too temp ? something like that im a little confused about getting the byte from w and what not ? But other then this I have a few pattern's working right now im soon going to go to the 4x4x4 Cube in hopes of going bigger after that and probably upgrading the PIC Last edited by Darkstar64; 13th October 2008 at 01:05 AM.

13th October 2008, 02:24 AM	#98
AtomSoft	im going to try a 4x4x4 in about a week and a month after that ill try a 8x8x8. Thats 512 LEDs. Thats gonna be fun. Maybe (MAYBE) ill try a 16x16x16 or just make a large table top design to go under my table and a clear glass over it and have a moving table but if i do ill be sure to use multiple (2-RB or 3-RGB) color leds. for a table it would be so nice with PWM control so i can control dimness. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

13th October 2008, 02:27 AM	#99
Darkstar64	Nice I was going to do the same thing with the table but use some cheap bright red LED's with some motion sensor's/light sensor's to detect when something is placed on the table then light the led's under it something like that but I still need to understand what fuz is talking about haha

13th October 2008, 12:07 PM	#100
AtomSoft	lol its funny i was going to use a blocked off light sensor like a photo resistor to determine if something is on the table. . The thing is i was goingg to make it look like a ball was bouncing around the table and when ever a object (light is blocked) it wil bounce off that surface. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics