Power pin from external 5V with USB connect

Post here about your Arduino projects, get help - for Adafruit customers!

Moderators: adafruit_support_bill, adafruit

Power pin from external 5V with USB connect

Postby moo » Sun Apr 29, 2012 3:34 pm

Is it possible to make several digital inputs from a external power source, switched from 12V to 5V on my breadboard using 10K pots., when USB is also connected? Will it be a ground loop? The two grounds are connected, but there might not be isolation enough? Any thought on this?
moo
 
Posts: 1
Joined: Sun Apr 29, 2012 3:29 pm

Re: Power pin from external 5V with USB connect

Postby franklin97355 » Sun Apr 29, 2012 7:56 pm

It would help to see the circuit.
User avatar
franklin97355
 
Posts: 1706
Joined: Mon Apr 21, 2008 1:33 pm


Return to Arduino

Who is online

Users browsing this forum: No registered users and 10 guests

Stuff to buy from the Adafruit store and links to product documentation!


New Products [102]

Raspberry Pi[80]
 
FLORA[23]
 
Bunnie Studios[9]
 
FPGA[1]
 
mbed[11]
Arduino[60]
 
NETduino[14]
 
BeagleBone[24]
 
Android[6]
 
XBee[10]
More Dev Boards[30]


 
BoArduino[8]
 
SpokePOV[4]
 
TV-B-Gone[4]
 
MiniPOV[3]
 
SIM reader[3]
 
Microtouch[5]
 
Clocks & Watches[18]
 
Drawdio[4]
 
Brain Machine[1]
 
Game of Life[2]
 
MintyBoost[2]
More DIY Kits[16]


 
MaKey MaKey[3]
 
Tweet-a-Watt[5]
 
Young Engineers[33]
 
Discover Electronics[2]
 
Snap Circuits[4]
 
littleBits[3]
 
Project packs[8]


 
Breakout Boards[33]
LCDs & Displays[48]
Components & Parts[69]
Batteries & Power[49]
EL Wire/Tape/Panel[52]
LEDs[109]
 
Wireless[14]
Cables[60]
 
Lasers[6]
Sensors/Parts[145]
 
Enclosures/Cases[11]
 
Solar[11]
 
RFID / NFC[13]
Prototyping[70]
 
iDevices[13]
Tools[71]
 
Wearables[39]
 
CNC[37]
 
Robotics[29]
 
3D printing[1]
 
Materials[24]


 
Stickers[41]
 
Skill badges[55]
 
Books[25]
 
Circuit Playground[7]
 
Gift Certificates[4]