Timeline for 5V power supply negative terminal connection
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 23, 2017 at 11:25 | vote | accept | Kyle Nathan | ||
| Jan 21, 2017 at 23:13 | comment | added | Milliways | @jwpat7 If you power with most switch-mode power supplies (such as the plug packs used as phone chargers) which are double insulated, the Arduino will be floating WRT ground, unless you connect to a grounded device. | |
| Jan 21, 2017 at 20:33 | comment | added | James Waldby - jwpat7 | @Milliways, the “it is usually only accidentally grounded through external connection” part seems false. | |
| Jan 21, 2017 at 12:38 | comment | added | Milliways | @Jason Your comment is imprecise. All electrical circuits need some reference connection. If it is a "dual power supply" it presumable has a common. If you have 2 independent power supplies they both need a reference connection - this is conventionally 0V, but any reference is acceptable. If you really intend using 12V, you should rethink your circuit, and NOT connect directly to the Arduino. I really don't see why you would want 1, let alone 2, external supplies to switch a few LEDS. The Arduino can only switch 40mA max (20mA recommended) without extra circuitry. | |
| Jan 21, 2017 at 11:44 | comment | added | Kyle Nathan | Thank you. What if I have a dual power supply 5V and 12V, lets say D3 needs 12V to work, and the others need 5V to work, should both the power supply's negative port be connected to Arduino GND as well? | |
| Jan 21, 2017 at 11:03 | history | answered | Milliways | CC BY-SA 3.0 |