OK, design work done. Now to start fabbing it.
Hi Wendy, on your 256 led layout, which control circuit are you using? I didn't see the control part in your zip.
OK, design work done. Now to start fabbing it.
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.
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
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.
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
I have aboutWhat are some of the IC's that you have ?
I'll try to post a sketch tomorrow.
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.
Thread starter | Similar threads | Forum | Replies | Date |
---|---|---|---|---|
G | Light flashing unit for car | General Electronics Chat | 133 | |
C | Push button flashing light circuit | Digital Design | 58 | |
Flashing protocol for stm32 | Microcontrollers | 1 | ||
Dyson dc01 hairdryer. 3 red flashing lights then stops working. | Technical Repair | 11 | ||
R | difference between: push-pull & flyback topo | General Electronics Chat | 2 |
by Jake Hertz
by Duane Benson
by Jake Hertz