Maker Pro
Maker Pro

Multiple pull-down inputs

ErikMichiels

Mar 29, 2013
1
Joined
Mar 29, 2013
Messages
1
Hello,

Do I have to use 4 separate resistors for connecting 4 digital inputs with my MCU? Or could I use 1 general pull-down resisitor?

Thansk in advance!
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
If they are unused inputs, yes. If you expect to use them as seperate inputs, you cannot connect them together.

Bob
 

gorgon

Jun 6, 2011
603
Joined
Jun 6, 2011
Messages
603
If these 'inputs' are configurable in/outputs, you can just configure them as outputs with no pulldowns. Most IO on a MCU can be programmed with a week pullup, so you may leave them unconnected too. This you need to lookup in the datasheet for the MCU.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Joined
Jan 21, 2010
Messages
25,510
But if they are inputs, and they are being used, you'll need a pull-down resistor on each (assuming you need a pull down)
 
Top