3 things at once

Other Hardware General Electronics
1

Hello, I'd like to connect 3 things at once: NFC Reader, Servo Motor, LCD Display, But i got only 3.3V and 5V, where should i connect the third one, can you send me circuit of example?

2

If you have a solder-less breadboard, the power rail holes are common to each other.

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You can make up some of these jumper wires:

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You can also make a version of these with as many parallel headers as needed:

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There is a 5v pin on the ICSP connector too.

3

You may find that powering the Servo with the Arduino 5V can cause problems. A 4 AA alkaline battery pack is good for servos.

4

You cannot, with single core processors do '3 things at once'

You may do one thing after another very quickly, but that is not the same as doing '3 things at once'.

5

imalfectyt:
Hello, I'd like to connect 3 things at once: NFC Reader, Servo Motor, LCD Display, But i got only 3.3V and 5V, where should i connect the third one, can you send me circuit of example?

Which one is "the third one"? LCD Display? Are you asking how to connect a 3.3V device to a 5V device? You use logic level translators. Did you run out of power pins? Yes, there aren't enough on the Arduino. In that case, you have to run the 5V or 3.3V pin to a junction (for example the 2 to 1 jumper above), then to multiple peripheral modules.

Many clones have extra power and ground pins to correct this design oversight (I'm trying to be kind here). I do hope you realize that the voltage that you connect to, has to be compatible with the supply voltage of the module.

6

If you have a UNO, (you didn't say), the IOREF pin is 5V.

7

JCA34F:
If you have a UNO, (you didn't say), the IOREF pin is 5V.

Yes, actually I have Arduino UNO and Leonardo. I am using UNO for this project so i think this will work! Thank you! Now I can finally make rfid door lock

8

srnet:
You cannot, with single core processors do '3 things at once'

You may do one thing after another very quickly, but that is not the same as doing '3 things at once'.

Well that's only true of software, the hardware facilities like timers and UARTs are truly running in parallel.

I'd second the point about powering the servo separately - keep logic and heavy loads separate (anything
with a motor is a heavy and inductive load). Common the grounds.

It would be nice if Vcc was brought out on several pins, but it isn't so you have to deal with this, as outlined
above there are several ways to do this.