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Topic: Troubleshooting: I can hear relay clicking, but load doesn't transfer? (Read 4109 times) previous topic - next topic

rockorsmthn

New to Arduino and cruised through the beginner projects included with the starter kit I bought...even managed to make a bunch of nifty improvements/mods while learning.  Zero issues, until now.

I am making this project, and followed it to the letter.  I did this several times - same result each time.  I can hear the relay switching...but the load doesn't transfer from one output to the other. 

Relay in question is aTianbo hjr-4102e-l-05v. 


larryd

Note the schematic does not show a series resistor for the LEDs, make sure you use one.

Sounds like you have a wiring error.

Show us a good image of your wiring.


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sdturner

If it is wired up as in the drawing the LEDs are burned out. There might have been a short bright blink the first time the relay changed. You need something like a 1K to 10K resistor in series with the LED(s).

tinman13kup

Are you sure the load is connected correctly? If you connect 5V to NO and the load to NC, it will never work. 5V  OR the load must be connected to the C pin, and the other to NO or NC, depending on if you want to switch it on or switch it off.

Is the led orientated the correct way (Anode to positive, cathode to negative (ground)? Do you have a current limiting resistor in series with the led? If not, 5v will blow the led and make it junk.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

rockorsmthn


larryd

No technical PMs.
If you are asked a question, please respond with an answer.
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rockorsmthn


rockorsmthn

If it is wired up as in the drawing the LEDs are burned out. There might have been a short bright blink the first time the relay changed. You need something like a 1K to 10K resistor in series with the LED(s).
I have 560k resistors in there.

rockorsmthn

Are you sure the load is connected correctly? If you connect 5V to NO and the load to NC, it will never work. 5V  OR the load must be connected to the C pin, and the other to NO or NC, depending on if you want to switch it on or switch it off.

Is the led orientated the correct way (Anode to positive, cathode to negative (ground)? Do you have a current limiting resistor in series with the led? If not, 5v will blow the led and make it junk.
No, I'm not sure it's hooked up correctly!  Can you see the picture (linked above) well enough to see how I've got it rigged?

LEDs are oriented correct way, and I've got resistors in there.  I tested it with a separate 5V input: they both light up no problem.

larryd

A 560K resistor is huge for a series dropping value.

Use 220 red red brown or 330 orange orange brown or 470 yellow violet brown or 560 green blue brown.


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larryd

The image is not good enough to determine how things are wired.



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tinman13kup

Looking at the pinout of the relay, it appears you have it miswired. Does the relay click as soon as you put power to the arduino?
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

tinman13kup

According to the diagram I'm seeing, breadboard rows 9 on both sides are the NC and NO pins. Row 10 on both sides would be the coil (seem kind of close), and finally row 14 is the C pin.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

rockorsmthn

No, it doesn't click until the program tells it to.

I'm not familiar with what I've done wrong here - still trying to understand terms like NC, NO, C, etc.

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