Free Project - 245 LED Display

[magu]

ok. i`ve check it. i have dificulties with 6 led, but i resolve the problem. It`s work excelent. Next step?

[Luciano]

Hi Magu,

For the next test you will need a signal generator.
(5V square wave of about 1.5 Hz).

If you don't have a signal generator, build this circuit:

(Click to enlarge the picture).

Let me know when you have the square wave signal ready.

Best regards,

Luciano

[magu]

Hi Magu,

For the next test you will need a signal generator.
(5V square wave of about 1.5 Hz).

If you don't have a signal generator, build this circuit:

(Click to enlarge the picture).

Let me know when you have the square wave signal ready.

Best regards,

Luciano

ok Luciano, i build the circuit. The led Blinks. NEXT? (What do i have to test with this circuit?)

[Luciano]

Hi Magu,

In my opinion in the schematic posted by Trent there is a mistake.
(Controller Schematic.pdf attached to the first post of this thread).
See my comments in the picture below.


(Click to enlarge the picture).

* * *

In this test we are going to use your new pulse generator.
Make sure you are still using the seven 180 ohm resistors for this test.

Plug into their sockets these chips:

IC3 (CD4017)
IC4 (CD4017)
IC5 (CD4017)
IC6 (CD4017)
IC9 (74HC08)


These chips are not present during this test:

IC1 (The PIC)
IC7 (The last CD4017)
IC8 (The EEPROM)

**********************

TEST

Step 1: Connect our wire "P1" to the socket IC1 PIN 1. (ROW1)
Step 2: Permanently connect to GND via a 1k series resistor PIN 3 of the socket IC7.
Step 3: Connect the 1.5 Hz clock from the 555 to to the socket IC1 PIN 12 via a 1k series resistor.
Step 4: Power-on the circuit.
Step 5: Briefly connect our wire "P2" to the socket IC1 PIN 11. This will reset the CD4017 chips.
Now you should see ONE LED moving across the display ONCE.

Step 6: Power down the circuit.

Do the same test for ROW2, ROW3, ROW4, ROW5, ROW6 and ROW7. (Move our wire "P1").

* * *

Now power down the circuit and plug into the socket the IC7. (CD4017).
Remove from socket IC7 PIN 3 the 1k resistor to GND. (The above step 2).
Repeat the test again. What do you see?

Best regards,

Luciano

[magu]

nothing happens. i don`t see anything. when the ic7 is unpluged and the pin3 is connected to the ground LED moving across the display ONCE except the last 3 leds that are connected to the ic7. But when the ic7 in pluged nothing appears even when i thouch the p2 to ic1 pin11

[magu]

i connect the IC3(pin15) to ic7(pin 10) and the LED is moving across the display NOT ONCE but CONTINUOS.

[Dan Cata]

Some people have already built the circuit and it runs just fine for them; i don't think there is a mistake in the schematic and i can't wait for Trent to reply and see what he has to say about this. (i apologise for my bag english)

[keithdoxey]

ok. i`ve check it. i have dificulties with 6 led, but i resolve the problem. It`s work excelent. Next step?

Get the other 239 LEDs to work LOL