Good morning, has anyone done or has any idea how to make a code to cascade several LED displays 5x7 with the shift register 74HC595, and the counter CD4017?
You images to make it easier for contributors....
So you have quite some hardware there already. Where did you get it - was there any documentation there and do you understand what it does?
J-M-L:
You images to make it easier for contributors....So you have quite some hardware there already. Where did you get it - was there any documentation there and do you understand what it does?
I was myself that made this board (PCB)!
One thing to consider is ghosting.
Using the 4017, there is no dead time when switching from one row to the next. So you must do that while all your columns are low. You could consider wiring up the Output Enable pins of your shift registers to the Arduino so you don't have to shift all your columns twice for each row.
So then you would:
- Set /OE high
- Clock-pulse your 4017
- Shift display data into 595s
- Set /OE back low
If you don't want to modify the wiring, you should - Shift zeros into 595s
- Clock pulse the 4017
- Shift display data into 595s
TZD2018:
I was myself that made this board (PCB)!
Did you also design the circuit and pick the components? If so, you must have a pretty good idea on how it has to work. Are you stuck on anything specific?