How to generate AC Square wave

Projects General Guidance
1

Hi guys,

I'm trying to do an electrolysis experiment where i have two probes (ofcourse)

Basically I feed the probes 10Volts DC however.. i have to switch polarity every 5 seconds.

Doing it by hand is ridiculous right? Should I not be able to get an arduino to do it?

Any advice guys.. I have an arduino but am a TOTAL NOOB at this stuff..

I can barely work the soldering gun LOL

HELP!!!!

2

A DPDT relay?

3

DPDT relay or H-bridge (which does the same thing, only solid state - meant to reverse motors) is just what you need. Make sure it can handle the expected current.

4

Run the DC thru a DPDT relay. In NC position, 10V/GND is applied, switch to NO position and GND/10V is applied.
Transistor to sink current thru the coil to energize it.

RelayPolarity.jpg
RelayPolarity.jpg960×720 15.6 KB

5

a QUICK google and yeah THATS seems what i need.

Same as reversing a motor ... you know of any projects that incorporate
DPDT relay for reversing polarity every x seconds?

DPDT on arduino timer circuit for idiots?

wishful thinking i know.

Thanks for the quick reply my friend at least I'm in the ballpark now.

Cheers

6

Look at blink without delay.
Replace LED with transistor driving relay.
Job done.

7

Wow thanks guys! yeah blink circuit and swap out led for transister..

Ok i think I got a handle on the direction..

I guess the only question that remains is what transister to use.

I will be pumping 10 to 12 volts MAX and 4 TO 8 AMPS.

Thanks for all the help!!

Cheers

8

The transistor will be driving the relay - the load current isn't an issue for the transistor, only the relay.

9

AWOL:
The transistor will be driving the relay - the load current isn't an issue for the transistor, only the relay.

Gotcha duh! "I knew that!" lol