PiGlow on Arduino - what am I doing wrong?

I tried with a Uno board today and I can confirm that the demo sketch is not working as intended (well, I wouldn't think that the intention is the pulse on a single LED you see).

try the following example, which, while unspectacular, should work as a test:

#include <Wire.h>
#include "PiGlow.h"
#define BRIGHTNESS 50

PiGlow piglow;

void setup() {
 piglow.setup(BRIGHTNESS);
 piglow.reset();
}

void loop() {
for(int pin = 0;pin<18;pin++){
 piglow.write(pin,10);
 }
}