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SOME THINGS TO REMEMBER
•
Keep the data connections as short as possible.
•
Do not split the data line as this will not work. (One LED cannot send data to two or more following LEDs)
•
The LEDs expect a TTL level (5 V) data signal but you can get an assembly working with an 3.3 V micor-
controller output (but 5V is better...)
•
Place a 470 Ohm resistor between the controller data output pin and the input of the first panel. (This is
not always necessary but it can help when you are having trouble with noisy data lines)
Power supply
Powering the VM207 is a bit simpler. There are 3 contacts labeled DV+, LV+ and GND, they respectively stand
for Data Voltage +, LED Voltage +, and Ground. The WS2812 LEDs that are mounted on the panels are
the 6 pin variant and these have separate pins for the 5 V for the LED die and the 5 V for the IC die inside the
package. So the DV+ pad is connected to all the IC die pins and the LD+ pin is connected to all the LED die
pins. In most occasions you can just connect these two and all will be OK. If you are worried by brown-outs due
to line-loss when you have a lot of panels that are operating at high brightness, you can have the IC dies on a
seperate 5 V supply (common ground!)
So the easiest way to power the panel is as shown in the drawing below:
USER MANUAL
K8403
fig. 5
6
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