thickness of wire supported by an arduino continuity tester

Projects General Guidance
1

First of all.. forgive me for my stupid question .. well I'm just a beginner :sob: and I want to create a wire continuity tester.. but the problem that I dunno, if the high thickness of the wire to be tested, can damage my board because of the high voltage..

please, I need guidance..

Thank you :slight_smile:

2

Why do you think there is a relation between testing thick wire and high voltage? Are the wires you're testing powered?

3

Thanks for your reply

Sorry .. my question wasn't clear enough...Well.. I want to check the continuity of 5 wires simultaneously.. so I'm wondering about the feasibility of this operation .. there are any limitations or constraints should I consider? can an Arduino board handle this?

4

can an Arduino board handle this?

Yes

5 outputs, each with an LED and a resistor to limit the current and you are in business

5

UKHeliBob:
Yes

5 outputs, each with an LED and a resistor to limit the current and you are in business

yesss.. I'm happy now .. :smiley:

thanks man!

6

The most important part is the current limiting resistors. The thickness of the wires being tested will not matter

7

UKHeliBob:
The most important part is the current limiting resistors. The thickness of the wires being tested will not matter

Hope the OP has taken the note about not being powered during any test.

8

Someone who doesn't know what voltage and current are is going to do what with circuits?

Put the wires on 5 pins of the same port, ground the other ends and use INPUT_PULLUP to test continuity and use the in-chip resistors. All 5 can be read in 1 cycle and checked in the next.

I suspect that the OP may be a visitor from AVR Freaks just having a bit of fun.

9

GoForSmoke:
Someone who doesn't know what voltage and current are is going to do what with circuits?

Put the wires on 5 pins of the same port, ground the other ends and use INPUT_PULLUP to test continuity and use the in-chip resistors. All 5 can be read in 1 cycle and checked in the next.

I suspect that the OP may be a visitor from AVR Freaks just having a bit of fun.

sorry about that.. I'm just a beginner .. n my basics are not strong enough due to the lack of practice.. so I decided to start this project to learn.. but I realized that I should revise my basics first before starting. that's it!

thank you..

10

Continuity testers are generally used to measure relatively low values of resistance, say a few ohms or less.

Thick wires just have a lower resistance than thinner wires of the same material., so are no problem for a continuity tester.

The wires may only have a resistance of a fraction of an ohm, but a continuity tester will work with right down to zero ohms.