5 buttons, relay, Servo control

Using Arduino Project Guidance
1

Still new to Arduino and electronics.
I have a simple project where I need 5 push buttons (left, right, up, down, reset), a relay for turning on a pico projector and a a Servo motor serving as a "shutter" for the pico projector.

I've tried these separately (except the relay) and they work as I expected.

Now I need to put it all together.
This is where my poor electronics knowledge shows. 5 buttons and a relay, how should I make them work together without issues? Connecting all of them to GND or some basic electronics concept I'm missing here which will get me into trouble?

2

've tried these separately

So reproduce the button wiring on five different pins. Have different program statements to look at each one in turn.
You need to wire up a relay to one pin through a transistor because the Arduino can not supply enough current to trigger one.

Then post your code if it doesn't work and we will help you get it going.

3

Thanks. I don't mean the code part.
I mean when all these buttons and the relay wil be connected to common ground, will something need to be added (resistor etc).

4

Just wire the buttons between input and ground. No need for any resistors just enable the internal pull-ups.
http://www.thebox.myzen.co.uk/Tutorial/Inputs.html

The relay needs a resistor and transistor like here:-
http://www.thebox.myzen.co.uk/Workshop/Motors_1.html

5

Okay. I just thought current "buildup" on GND could be an issue for things connected to it.

6

Wait, you mean standard push buttons have a resistor inside them?

7

bump

can someone comment on this?:

ghosttrain:
Okay. I just thought current "buildup" on GND could be an issue for things connected to it.

8

Hi,
Is it deja vu, or is there another on or two, shutter with stepper threads around? ? ?

Tom.... :slight_smile:

9

ghosttrain:
Wait, you mean standard push buttons have a resistor inside them?

No, what makes you think that?

ghosttrain:
I just thought current "buildup" on GND could be an issue for things connected to it.:

There is no such thing as current "buildup", I think you are misunderstanding how electricity works.

10