08/30/2019 at 00:24 •
Sept 29, 2019 - I am surprised that no one has commented about a slight quirk going on with the display. Notice that when transitioning from 6 to 7 that 8 is briefly shown. Turns out that the sequencer outputs 6 and 7 are both high at the same time for a brief moment and the display diode matrix has all leds active for that short time. This might actually turn out to be a bonus as it might assist with writing to a register much like the Cardboard Computer - IO. IO's sequencer had the same effect and came in handy.
I spent the better part of this afternoon wiring the Light Logic Sequencer to the diode display from the IO project. The display counts from 1 through 7 for this circuit and loops back to 1. Not bad considering only diodes, resistors and caps are used.
08/20/2019 at 12:58 •
Here Be Dragons - Sounds about right for Light Logic about now. I am realizing how much in uncharted waters I have become with the development of LL. The individual gates are fairly straight forward digital in and digital out but with the design and construction of the sequencer, I see analog and digital blending and twisting around into a mesmerizing light show. Is it a part of the processor I want to design and build or is it a stand alone piece of art. Or is it both, I am so confused right now. All I do know is that I must press onward into those waters and discover what is beyond. Thank you @Starhawk for the idea.
08/19/2019 at 14:53 •
Just some things to think about if anyone wishes to duplicate Light Logic.
1 - There is a wide low end resistance value range with CdS photo cells so try to test and match the cells used.
2 - Stray light will kill the Light Logic effect faster than anything else. Light shielding around the Led/Ldr pair IS required.
3 - Operating voltage is very critical and selection of support resistors is somewhat trial and error.
Light Logic in its current development is still very experimental and requires a lot of hands on adjustments.
08/18/2019 at 22:21 •
This is the usable seven step sequencer for the future all Light Logic processor. Resistor and capacitor values need to be tweaked for best performance but this is working better than I had planned on in so short a time.
08/03/2019 at 23:49 •
The three phase Astable is now a seven step sequencer. When wired in order 1,2,3,4,5,6,7 the firing order is 1,6,4,2,7,5,3 then returns to 1 so it steps by 5. The sequence does repeat. This can be the sequencer and clock combined for IO2 the Inside Out Light Logic computer. No other clock will be needed.
Here is a good display of the sequencer in action and I realized that I now have a solid clock and sequencer in a single circuit. This will be used for the Light Logic computer project this winter.
I ran out of ideas other than adding a starter switch to the panel. On power up the loop freezes so I have to ground one input in order to unbalance the loop. Then I got the scope out and then the music fits the display.
That is a trace of cell one followed by cell six.
After I looked at the output traces, I wanted to see if I could sharpen them up a bit. so I added a Light Logic non-inverting buffer gate to the output of cell number one and the next video clip shows a big improvement. The lower trace is output number one and the top trace is the same output run through the buffer.
08/02/2019 at 15:55 •
This circuit is so cool to look at while running and took me the better part of a week to figure out. The goal was to make a LED Chaser using Light Logic and I am pleased with the result to this point.
I have looked at the signals with my scope and indeed it is outputting what looks like smooth sine waves.
07/20/2019 at 09:17 •
Here is another XOR circuit that I wired and tested last night. Thanks to Yann Guidon for this idea as it does further reduce the parts count. The Input resistors are optional depending on the logic level voltage. For a XNOR, just reverse the +5 and ground. This XOR, once again, has good solid logic levels on the output.
07/16/2019 at 10:01 •
I now have, thanks to @Starhawk for the nudge, managed to create A XOR and XNOR gate that uses just a single Light Logic switch. I no longer need to combine other gates for these logic functions. Logic highs are 4 volts or higher and the low levels are less than 0.5 Volts. Good enough to be used with the rest of the Light Logic family.
06/22/2019 at 22:24 •
I am working on a educational display to showcase Light Logic and how it works.
This is a combination of NAND, OR and AND gates to create a working XOR gate. And as the same for all Light Logic gates, transistors are not to be found. Just diodes and resistors. Power leads are under the paper to better show the logic wiring.
05/31/2019 at 23:29 •
I have worked out the circuits for the following gates. AND, NAND, Buffer, NOT, OR and NOR. With these I can make XOR and XNOR gates as well. These gates have good fan-in and fan-out capability.