void test_pca9685(PCA & pca)
{
	//Rise
	float val = 0.0f;
	for(; val < 1.0; val += 0.001f)
	{		
		for(unsigned i = 0; i < 15; ++i)
			pca.set_channel_pulse_width(i, val);
	}
	
	//Fall
	for(; val > 0.0; val -= 0.001f)
		for(unsigned i = 0; i < 15; ++i)
			pca.set_channel_pulse_width(i, val);
}