Topo Map with flashing LED

Wendy

Joined Mar 24, 2008
23,415
It was meant to be a test bed for circuits like these.

The 100 LED sequencer will interface with it, and I thinking of an oscope circuit down the road. It would be good for PIC and Arduino circuits when I get around to doing those.
 

Bernard

Joined Aug 7, 2008
5,784
Since you have 4017's, I presume that Wendy will draw 256 LED circuit using two 4017 in series for 16 outputs for X & Y axis of the matrix.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
Are you wanting a full 250 led sequencer?

A better approach would probably be similar to Figure 9.2, where waves of moving LEDs denote a river.

http://forum.allaboutcircuits.com/threads/leds-555s-flashers-and-light-chasers.19075/#post-117645

Yes a full 250 LED sequencer. Maybe be more. Absolutely Awesome! I was thinking fade in & out for the whole region and parts of the upper & lower sections can do chasing or waves or some sort of dancing. Open to suggestions. Anything will help!
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
Hi Wendy, on your control schematic of the 100 LED's, do you have a push button to trigger the chase or does it chase automatically when power is applied? Also, I have a 1000 watt computer PS that I was thinking of providing the 12V. That should be enough to power all the LED's don't you think?
 

Wendy

Joined Mar 24, 2008
23,415
No, it is automatic. You would need a slight modification there to make it push button activated. Pin 4 of the oscillator (the 555) is a reset, and can enable / disable the 555 easily.

Problem with a computer power supply is the other voltages. They will need loads, probably substantial ones, for the power supply to operate reliably. Of the 1000W only a fraction will go toward the 12VDC. If you have 300 LEDs all lit at the same time at 20 ma that is around 6A, and around 72W just for the 12V portion. You will probably need to segregate the circuits a bit to balance the load between several power supplies.

This is not a recommendation, just an off the cuff lookup.

http://www.bgmicro.com/12v-3a-regulated-power-supply-by-sceptre-power-1.aspx
 

Bernard

Joined Aug 7, 2008
5,784
A thought: If 300 Red LED's were converted all to parallel throbbing, then a single 6 V, 5 A power supply
should be able to supply all power needs ?? Found several on eBay.
 

Wendy

Joined Mar 24, 2008
23,415
I may switch over to Ron's schematic. The modificationss are minimal, but it would use 20 of the same transistors instead of 2 groups of each type.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
No, it is automatic. You would need a slight modification there to make it push button activated. Pin 4 of the oscillator (the 555) is a reset, and can enable / disable the 555 easily.

Problem with a computer power supply is the other voltages. They will need loads, probably substantial ones, for the power supply to operate reliably. Of the 1000W only a fraction will go toward the 12VDC. If you have 300 LEDs all lit at the same time at 20 ma that is around 6A, and around 72W just for the 12V portion. You will probably need to segregate the circuits a bit to balance the load between several power supplies.

This is not a recommendation, just an off the cuff lookup.

http://www.bgmicro.com/12v-3a-regulated-power-supply-by-sceptre-power-1.aspx
A thought: If 300 Red LED's were converted all to parallel throbbing, then a single 6 V, 5 A power supply
should be able to supply all power needs ?? Found several on eBay.

Hi Bernard, for fading in & out, connecting 300 LED's in parallel should work ok? Much simpler right? Just using a 555 timer or is there a better circuit?
 

Bernard

Joined Aug 7, 2008
5,784
Wendy's circuit 12.2, Ex D, see post # 105 for her Index. Q3 should be logic level, 6A or better, low resistance.
A bunch of resistors, 300, about 390 ohms for red LED's @ 6 V supply. Check your IC stock for comparators.
Regular 555's should be OK. Watch for Wendy's comments.
 

Bernard

Joined Aug 7, 2008
5,784
It makes me shudder when I contemplate wiring a 16 X 16 matrix as single file. As an alternate might use 16
74HC154 DIP24 4 line to 16 outputs decoders placed like STREAM dead bug style; 4 address lines daisy chained ,& 16 lines from another 4 to 16 decoder , one line to each decoder to tell it when to be active. Additional IC's- dual 4 bit counter & 555 clock. Decoders about 1 $ ea. on eBay.
No additional drivers needed. 74HCXX , Vdd 5.9V, white LED in series with selected Rs. Output low.
R 1500 I 2 mA output V 56mV
R 680 4.3 mA, 129mV
R 330 6.5 mA , 196mV
R 220 10.4 mA , 322mV
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
It makes me shudder when I contemplate wiring a 16 X 16 matrix as single file. As an alternate might use 16
74HC154 DIP24 4 line to 16 outputs decoders placed like STREAM dead bug style; 4 address lines daisy chained ,& 16 lines from another 4 to 16 decoder , one line to each decoder to tell it when to be active. Additional IC's- dual 4 bit counter & 555 clock. Decoders about 1 $ ea. on eBay.
No additional drivers needed. 74HCXX , Vdd 5.9V, white LED in series with selected Rs. Output low.
R 1500 I 2 mA output V 56mV
R 680 4.3 mA, 129mV
R 330 6.5 mA , 196mV
R 220 10.4 mA , 322mV

Sorry Bernard, I am a noobie when it comes to this stuff. I don't want to be discouraged with electronics but would like to learn it and create things like everyone on the web site has done. Since I have twins that are going to start school in August, my life is busy and don't have time to take a electronics course so I rely on the web to provide me information that I seek. This is the very 1st time I have ever joined a forum so I am still learning. I am sorry that I am a little slow at grasping your information but it takes time. I will study your information and learn about the chips you have mentioned. I just placed an order for 74HC154 so I will get to play with them. I am not sure on how to draw it out on a schematic but I will post what I come up with. Thanks for all your help!
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
What are some of the IC's that you have ?
I'll try to post a sketch tomorrow.
I have about
(100) NE555 timers,
(20) NE567 timers
(100) 4017
(5) 74154
(5) 74193
(12) 7404
(5) 74LS04
(25) 4011
(20) 2n2222 (To-18 package)
(100) TIP31
(50) 7805 Reg
(50) 7812 Reg
Bunch of caps and resistors

I know I have more stuff but haven't gotten to them yet. Since my Dad passed away I haven't had the interest to look thru things. Now I feel like I can go thru stuff. You and Wendy have helped me tremendously and I hope 1 day I can gain the knowledge that you both have. Thank again for all your help.

Steve
(65) 317T Reg

(20) 7400
 

Bernard

Joined Aug 7, 2008
5,784
Nice list, with a 555, 2 ea 74193 up-down counter, one 74154 for control, & 4
74154's you could set up a 64 LED up-down chaser on a big breadboard.
Pin out is the same for 74154 as 74HC154. Either can drive a LED.
 
Last edited:

Bernard

Joined Aug 7, 2008
5,784
Here is outline of a 256 LED chaser. There are errors in connecting decoder outputs to LEDs, #14 is short one LED so all outputs are shifted down one leaving pin 17 no where to go. #15 OK/, # 16, pin 4 & 5 corrected but needs a little whiteout. The TTL's 74193 from your stock, need 5.5 max V so should drop VDD, 6V, by one diode drop to make VCC about 5.5V for TTL's. Note that all IC are bottom up for dead bug wiring.
#20,555, supplies the fast clock say 1/10 sec. to # 19, a 4 bit binary counter. The 4 output address lines go to
each of the 16 decoders. If all of the 16 G1-2 inputs were grounded we would have 16 ea. of 16 LED chasers ( Wendy & my choice ) but when connected to # 17, control decoder, one output to each of the 16 decoders G1-2. When the last LED in string goes out, counter # 18 advances, enabling decoder #1, & we start all over again.
Big note: With all G1-2's grounded, 16 LED's at a time would be operating in parallel, a no- no on AAC.
Another note: Decoders +V, pin's 24 should go to VDD not LED's + bus.
I do Chacer 256 00000.jpg not have the energy to start over.
 

Thread Starter

lednoob

Joined Jan 13, 2016
171
Here is outline of a 256 LED chaser. There are errors in connecting decoder outputs to LEDs, #14 is short one LED so all outputs are shifted down one leaving pin 17 no where to go. #15 OK/, # 16, pin 4 & 5 corrected but needs a little whiteout. The TTL's 74193 from your stock, need 5.5 max V so should drop VDD, 6V, by one diode drop to make VCC about 5.5V for TTL's. Note that all IC are bottom up for dead bug wiring.
#20,555, supplies the fast clock say 1/10 sec. to # 19, a 4 bit binary counter. The 4 output address lines go to
each of the 16 decoders. If all of the 16 G1-2 inputs were grounded we would have 16 ea. of 16 LED chasers ( Wendy & my choice ) but when connected to # 17, control decoder, one output to each of the 16 decoders G1-2. When the last LED in string goes out, counter # 18 advances, enabling decoder #1, & we start all over again.
Big note: With all G1-2's grounded, 16 LED's at a time would be operating in parallel, a no- no on AAC.
Another note: Decoders +V, pin's 24 should go to VDD not LED's + bus.
I do View attachment 99581 not have the energy to start over.
 
Top