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_q12x_

_q12x_

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Thanks to mister @marconi , I received his chip AT28C16 gift from England !
I will start to make the 5x7 led matrix project that you did.
I will make it alone as much as I can (as usual). And I will ask you for clarifications on the way.
 
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marconi said:
Have you programmed the eeprom with letters B, C, D……..P - as you did for A?
Click to expand...
not yet, I was about to do it but... I got this error in the memory I guess.
I only have an A in addr 00 another A in addr 01 and the rest are tests from before, with no meaning.

marconi said:
please draw me a circuit diagram for how the bottom left 7493 is connected.
Click to expand...
[ElectriciansForums.net] AT28C16 EEPROM learning experiments
 
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_q12x_ said:
teoretically yes, going through each led and its respective resistor.
View attachment 101919
Click to expand...
No you do not because the LEDs are not conducting as there is no forward bias across them when the Q output is logic 0 ie at 0V.

Do you remember I mentioned the use of a buffer gate to drive an LED from an output? Drive the leds of the bottom left 7493 by the circuit I sent you earlier - #54 last paragraph and second attachment. Also connect each address line to 0V with a 10kR.

Have you linked the top rows of the 5V and 0 v rails at the mid point of the breadboard To the bottom rows of 5V and 0V rails?
 
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yes everything is connected in line - no problem there
I dont have any buffer's - I just check my list of IC's and nothing.
I will have to put transistors instead, right?
I took out the leds and try it again, and guess what? is still the same, no change. So its not the leds not being driven by a buffer. I also have another 7493 that is counting to 7 and that is having the same 4 leds on its Q's and absolutly no problem ever from that one. So nothing should be from this one's as well, logically, right?
 
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I remember last night when it worked, I had this arrangement from original experiment.
It was not doing anything important so I remove it today.
I start to believe it was affecting the circuit.
[ElectriciansForums.net] AT28C16 EEPROM learning experiments

All the switches are turn off, and all the addr pins are pull down by those blue resistors on top near the blue DIP switch.
Ive already put resistors to gnd on each addr pin but no effect, it didnt repaired the problem.
 
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If you have removed the eeprom just check its pins have not been bent underneath it when reinserted.

check CEbar and OEbar pins are connected to correct 0V rail.

check WEbar is not floating but connected to push button pulse circuit and should normally be logic 1.

check eeprom has been reinserted correctly to align pins with breadboard connections.

check scan clock is at 1000hz or lower.
 
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Thanks for the medal
[ElectriciansForums.net] AT28C16 EEPROM learning experiments
mister @marconi; it was hard for me because I actually had to think what to do and how to do it and also resolve all the errors that appear on the way. Some seem unsolvable without my good friends help. I took it very slow because I had to get used to these logic gates, get experience with them, also the counter IC's and the memory itself. it was very hard project to deal but I learned and most important I got experience and I understood some interesting practice I can use in my future projects - (specifically that counter). I know a lot of stuff but putting my hands into this project and actually do it, practice will beat any time what I read in the past and my general knowledge. Im happy I made it work. Now I can say more confidently I am more good with logic gates than when I started, for sure.
 
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So mission accomplished -
I am discompleting all the breadboards and put back all the IC's today.
So no way to get back now. I will wait 2h before doing it, until your answer here.
After that I will do it.
 
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A simple way is to convert a 4 bit binary code into a 4 bit Gray code using combinational logic. See video above.

The three logic gates are EXOR. A Two input EXOR gate can be made from NAND gates.

The XOR gate is built from four NAND gates like this:

[ElectriciansForums.net] AT28C16 EEPROM learning experiments

The XOR symbol is

[ElectriciansForums.net] AT28C16 EEPROM learning experiments
 
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_q12x_ said:
Also mister @marconi , did you made that gray code circuit already? Do you have a movie to present it? Also Im curious on your approach/ design. How did you use it or at least assemble it?
Click to expand...
I used 4 jk flip flops each connected as a type T (toggle). I made some combinational logic but could have used a look up table to cause each flip flop to change state or not depending on the current state - ‘ if then otherwise‘ type logic. This makes what is called a 'finite state machine'.
 
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