I am currently working on a robot. All the grounds coming from all components are grouped up. I have an ssc-32u, a few sensors, a sound device, etc...
The common gnd wire should have gone to the gnd pin on the arduino...i connected it to the 3.3v pin instead..all components remained on but did not work correctly. everything seems to be working now that i connected it back to the gnd pin. But still a bit paranoid. What do you think about this?