### Author Topic: Very Basic Question!  (Read 1110 times)

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#### rockrobotics

• Jr. Member
• Posts: 46
##### Very Basic Question!
« on: March 11, 2010, 09:38:52 AM »
Hi,

I'm very new to electronics and to robots and I want to know
how you connect the three pins on a potentiometer!  I know this is really simple to you experts, but please explain it to me.  I don't get why it has three pins!  Please help.

Thanks,

Newbe
Rock Robotics

Technology of the Future!

#### chelmi

• Supreme Robot
• Posts: 496
##### Re: Very Basic Question!
« Reply #1 on: March 11, 2010, 10:14:16 AM »
Multiple posts...

What do you want to do with your potentiometer?
If you just need an adjustable resistor, use the middle pin and on of the other one (doesn't matter which one).
If you want to do a voltage divider to get an adjustable output voltage, connect it like that:

VCC -----+
|
| |
| |<---- out
| |
|
GND -----+

Chelmi.

#### rockrobotics

• Jr. Member
• Posts: 46
##### Re: Very Basic Question!
« Reply #2 on: March 11, 2010, 10:37:13 AM »
Thanks,

Rock Robotics

Technology of the Future!

#### Soeren

• Supreme Robot
• Posts: 4,672
##### Re: Very Basic Question!
« Reply #3 on: March 11, 2010, 04:42:40 PM »
Hi,

If you just need an adjustable resistor, use the middle pin and on of the other one (doesn't matter which one).

Better yet, connect the unused "side pin" to the middle pin. That way the resistance can never be more than the value used and cannot go open (in some circuits that would be disastrous).

Like this
Code: [Select]
`    -----+         |        | |        | |<--+ out        | |   |         |    |    -----*----+`
Regards,
SÃ¸ren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Engineering is based on numbers - not adjectives

• Jr. Member
• Posts: 46