Row of LEDs on large bread board, only half work

Using Arduino LEDs and Multiplexing
1

Hi all,

How come only half of my LEDs are lighting up?

void setup() {
for (int i = 1; i < 8; i++) {
pinMode(i, OUTPUT);
}
}

void loop() {
for (int i = 1; i < 8; i++) {
digitalWrite(i, HIGH);
}
}

thanks!

2

You may need to bridge across the center of the horizontal power and ground busses.

bb.jpg
bb.jpg1755×615 203 KB

3

Thanks for the very quick reply. Connecting a bridge to the ground solved this issue.