12v Relay problem

[rschuh54]

Hi guys , im using a 12v relay powered from the arduino uno and im getting signal and the light comes on but no clicking ? am i stupid or is the relay stuffed?

 

[Musicmanager]

Take the exclamation marks out .. .. ie

digitalWrite(relay, LOW);

MM

 

[rschuh54]

Take the exclamation marks out .. .. ie

digitalWrite(relay, LOW);

MM

Still not clicking , flashing of light is correct but no clicking

 

[Musicmanager]

Have you got anything connected to the relay ? The 'click' may not be audible ?

MM

 

[rschuh54]

Have you got anything connected to the relay ? The 'click' may not be audible ?

MM

I have connected the desired 12 v water pump accordingly with a 12v dc and does not work

 

[Musicmanager]

Sorry, scrub that .. .. .

It looks as though your trying to power a 12vdc Relay coil with 5vdc from the Uno .. ..

 

[rschuh54]

Sorry, scrub that .. .. .

It looks as though your trying to power a 12vdc Relay coil with 5vdc from the Uno .. ..

ive got the 5v from arduino going into the vcc on the relay, gnd to gnd. the 12 v dc plug is connected to the water pump with the negative split connected to NO and COM

 

[Musicmanager]

Yes, but .. .. .. look what's written on the back of the relays .. the coils won't open with only 5vdc they need 12vdc

 

[rschuh54]

Yes, but .. .. .. look what's written on the back of the relays .. the coils won't open with only 5vdc they need 12vdc

oh so i need a 5 volt relay, will that power a 12 v appliance ?

 

[Musicmanager]

Yes .. .. .. ..

If you read the print on the back of the relay

12vdc is the coil - used to operate the switch

10A - 250vac - max load for the switch

15A - 125vac

you need a relay with a 5vdc coil

If you Google 5vdc Relay module there's loads of good examples

MM

 

[rschuh54]

Yes .. .. .. ..

If you read the print on the back of the relay

12vdc is the coil - used to operate the switch

10A - 250vac - max load for the switch

15A - 125vac

you need a relay with a 5vdc coil

If you Google 5vdc Relay module there's loads of good examples

MM

Thankyou so much, very appreciated!!

 

[Pommie]

Do you have a link to the relay board? It looks like it uses opto-isolators to switch the relay and Vcc may need to be 12V (on the relay board only).

Mike.

 

[rschuh54]

Do you have a link to the relay board? It looks like it uses opto-isolators to switch the relay and Vcc may need to be 12V (on the relay board only).

Mike.

its a 4 channel 12 v relay from duinotech link is https://www.jaycar.com.au/arduino-c...N3Tqqd-MmrSOAST2AeoeMF8SelO_2ZnBoCNKoQAvD_BwE

 

[Diver300]

its a 4 channel 12 v relay from duinotech link is https://www.jaycar.com.au/arduino-c...N3Tqqd-MmrSOAST2AeoeMF8SelO_2ZnBoCNKoQAvD_BwE

It needs 12 V on the Vcc connection of the relay board.

Do not connect 12 V to the Vcc connection of the Arduino. That will damage it. You have to disconnect Vcc on the Arduino from Vcc on the relay board.

 

[rschuh54]

It needs 12 V on the Vcc connection of the relay board.

Do not connect 12 V to the Vcc connection of the Arduino. That will damage it. You have to disconnect Vcc on the Arduino from Vcc on the relay board.

could i use a 5v relay instead and use the arduino?

 

[Diver300]

could i use a 5v relay instead and use the arduino?

Yes, that should work.

The coils of 5 V relays will take more current than the coils of 12 V relays that can switch the same current. You would have to make sure that the overall current draw is not too much for the 5 V USB supply.

 

[Diver300]

https://pdf1.alldatasheet.com/datasheet-pdf/view/1131793/SONGLERELAY/SRD-12VDC-SL-C.html
That shows the 5 V relays take about 70 mA each. Four of those is 280 mA so it will take more than the 100 mA that USB is specified to supply without negotiating for more current. However, a USB power bank or wall adaptor will not have a problem with 300 mA, and most computers won't have a problem either.

 

[crutschow]

could i use a 5v relay instead and use the arduino?

Yes, but it's likely cheaper just to buy a 12V wallwort to power the relays.