RGB LED battery powered (rechargeable) Matrix Text Scroller
Step 1: Crazy Idea
Step 2: Material
Decade counter CD4017 (x1)
RGB led 4 pins common positive (x100)
Arduino Nano (x1)
1 KOhm resistors (x6)
NPN transistors 2N3904 (x6)
DIP Switch 9 modules (x2)
Hot glue gun
Rechargeable 7.4V 1500mah NiCd battery (any battery between 7V and 15V will do a good job)
Resin or Plastic or whatever you can get to hold LEDs (i cut mine using Laser and 3 mm plexi)
Huge coffee (x3) prefered black (no sugar, no milk, no nothing)
Step 3: Assemble the "Screen"
Then, using cooper wires amd soldering iron, i connected positive poles in order to connect it later on to Shift register output.
Remember, Shift Register (positive) Decade Counter (Negative).
Now, Screen is ready.
Step 4: Circuit Preparation and Assembly
I used jumper wires to connect columns to the shift register and CAT 5 cables for rows connection to the decade counter.
Now, each output of the Decade counter is used 3 times. using the Fork theory ( 1 input, many output. in my case, 1 input, 3 outputs).
each output of the decade counter is connected to 3 ports of the DIP switch, and using jumper wires, i connected for example, pin 1 to pin 2 and pin 3 of the DIP switch. Switch will manually change color of each row.
Step 5: NPN Transistors and 1KOhm Trick
Clever, but time consuming.
Emittor pin to the DIP switch, Collector from the decade counter, Base to Negative.
Step 6: Last Assembly
using an old schematic and an old program that i already used to build a huge 150cm × 60cm scroller, i assembled it the same way.
The only tweak was in the DIP switch.
(I will post the code and schematic later)
Et Voilà, a RGB LED scroller is born.
(Happy dancing Happy dancing Happy dancing)
Wait !!! where is my COFFEE !!!