Need help with wireless relay Please Help

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=13658
Printed Date: June 09, 2024 at 6:13 AM

Topic: Need help with wireless relay Please Help

Posted By: Dlou87
Subject: Need help with wireless relay Please Help
Date Posted: May 17, 2003 at 9:48 PM

I dont know much about electronics.

I am tyring to control some LEDs that are located in a car. I bought a "2 channel UHF reciever" which can be seen here:

https://www.hobbytron.net/product1416.html

The relay board reciever has a GND and 2-12v hook up, so to test it, I put the negative side of 9v battery to the GND, and the positive to the (+) on the receiver board. So now, it lights up and I can use the remote control to turn the LEDs on the receiver on/off which I guess shows that the switch for that LED is on or off.

Now I try to hook up my LEDs to the "relay" hookups on the other side of the board. I thought it was just like a regular everyday switch, so I connected the (-) wire from the LED to a battery, and I figured I would connect the (+) wire from the LED to one of the three connections on the relay board thing which are "C", "NC" and "NO", and see which one worked but nothing happens, so I try everything possible, and still nothing!!! I am getting really fustrated.

Please Help Me Out!!!

I really appreciate it.

Replies:

Posted By: xetmes
Date Posted: May 18, 2003 at 10:40 AM

hmmm. 9 v is a bit much to put on an Led (assuming it has no resistor), but you say it didnt light up at all?

I think the problem is you did not hook up the battery to the relay also, as far as i can read. The relay acts like a switch but needs to complete a circuit path. Leave the ground on the cathode (negative side of the led) and hook the Anode (positive side of the LED) to the NO terminal. But hook up the positive side of the battery to the C terminal. That should work if i understand the problem correctly.

Also you may want to put a resistor in series with the LED to limit current (unless it has some sort of inline resistor).

good luck!

Posted By: Orang
Date Posted: June 16, 2003 at 9:32 AM

Hi Dlou87.

Normally the switch on relays is not hooked up to to either plus or minus. You might want to hook up the common pin on the relay switch to (fused) postitive and the positive pin of the LED to pin (on the relay) that is connected to common when active.

So basically you need a switch that will connect the Common pin to pin B
when you press ON button of the remote and when you press the OFF button, the switch will connect the Common pin to pin A (unused).

           A   B
Coil   @ @ Positive lead from LED
----)|   |     |
     )|      /
     )|     /
----)|   @ Common Pin.
                (Fused) Positive

Hope this helps.