Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

3 way latching swich

Status
Not open for further replies.
Englewood said:
Okay, so I'm going to run this of a 5V supply will I need a resistor?

What pins are +/- as i cant find the answer :thinker:
Click to expand...

No resistor required if you run a 5v relay off 5v.

These latching relays have a permanent magnet to hold the relay in either condition when neither coil is energised. That stops it flapping about.

It is important to energise the coils in a direction that works with the internal magnet, not fight against it. So the coils are marked + and -

It will probably work either way, but it will work much better when the coils are connected the right way around.
 
  • Like
Reactions: CataM

    C

    CataM

    Points: 2
    Helpful Answer Positive Rating
Cheers Guys,

I have a play when i get the relay in a couple of days :)

- - - Updated - - -

Would some one be kind enough to do a diagram of the 2 buttons and the relay wiring?

- - - Updated - - -

Just going to explain my design.

I have a moving tray that will move from one point to another via a motor and turn on a led.

When someone opens a door the motor will move the tray in one direction and hit a button/switch and turn a LED on but also stop the motor.

When the door is closed the tray will move back to its original position and hit a button/switch to turn the LED OFF and stop the motor and reset the relay.

I need the relay to hold first push button HIT in because when the tray starts to move back to its original position it stops the motor as soon as it moves. (Hence the tray cant get back to its original position unless the button is latched)
 
Last edited by a moderator:

See if this works:
Tray.jpg
 

Thanks Tony, I simulated this in proteus but couldn't get this to work.

I will be using one laser now instead of a LED. Sorry!!!!
 

That's my thoughts as well, cheers Tony :)
 

I'm struggling a little with this, sorry basic electronics in my mind.

I cant get the motor to turn backwards ive not used a relay yet.

How will I get the motor to turn backwards when the switch is down.

motor.jpg
 

On post #23, when the Latch relay changes, the motor moves on the opposite direction. Anyway, here is other possibility.

 
Cheers, I know what you mean now just had a play with the relay :)
 

Implement the scheme on post #23 because uses only 2 commutators.
 

This is popularly called the staircase switch circuit.
 
  • Like
Reactions: CataM

    C

    CataM

    Points: 2
    Helpful Answer Positive Rating
Will I need a resistor to the relay? only using 5v but its has a maximum of 2A.

This is the PIN OUT for the relay.

I assume 1 & 5 - 6 & 10 are the coil connections
Then either side of the motor to 2 & 9?

Relay.jpg
 
Last edited:

It's a 5v relay and the two coils will work straight from a 5v supply.
No resistor needed.

The LEDs will each need resistors, try about 470 ohms to start with, and see how bright they are.
 

Cheers Tony, I'm using a laser now :).

Great help from you guys, I only passed a home study BTEC course last year.

- - - Updated - - -

Crap!!!. Its a 12V relay, sent me the wrong one :-(.....
 

Cheers Tony,

I'm not using 2 X LEDS I'm using one laser like in post 32 :).
 

Its only 3V :-( as its a prototype.

Ill just have to wait for the 5V relay to come,
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top