Hey guys,
I'm building a controller to mash beer. It's a project called BrewUno. But I would like to add an LED to show when the resistance and the pump are on. The SSR does not pass power when set to off and does when set to on. But when I put this led, but even configured as off, the power turns on. How should I connect this led?
Tks,
Marcos Rinaldi
post some info on the 127V LED.
Post some info on the SSR, which looks like a 12V SSR and not a 5V SSR.
There is NO need for a transistor to control the SSR. Control it directly from an Arduino pin! You can even put a LED in series with the 3-12 VDC SSR relay control and your LED and the LED in the SSR will both be on and off at the same time.
Post an annotated schematic and links to the hardware items.
I don't know the name in English. Here, some informations with Google Translator:
The Bull's Eye Signals are gas discharge lamps that contain mainly neon at low pressure. The term is sometimes used for similar devices that contain other noble gases, usually to produce different colors.
This is the SSR:
Yes.. that was an option in the assembly but as some users were reporting interference, the suggestion was to put this transistor and as I had one, I didn't see any difficulties in using it. Do you think it gets in the way?
It's an idea but the advantage of this led is that it has a good size. Besides, I've already pierced the box. I can't do that with this one? For me, it was in series.
Not sure what you mean by this - do you mean the "LED" lights up? It isn't an LED, it's a "neon" indicator which has a gas discharge tube with a series resistor. It's designed to go in parallel with an AC mains supply and will indicate if it is switched on. It only needs a small current to glow.
It is likely that the SSR has an internal suppressor capacitor on its output which is leaking enough current to light up the indicator. You should put the indicator ("LED") across the resistance/pump where it should operate as you intend.
But the strange thing is that when I measure the voltage without the "led", it is zero, as it should be since the SSR is not activated. But when I connect the "led", the voltage goes to 127V even with the SSR turned off. As if he bypassed the SSR.
Which voltage, measured where exactly?
I measured a little over 127v. Around 140V. The same when I turn off the led and turn on the SSR.
See the NPN circuit on page 4:
SSR-SSR-AA.pdf (2.0 MB)
I don't know if I understood what you said, but the issue is that I'm not triggering a load with the SSR (yet). It's like if I put a light bulb in a socket and it works even with the switch turned off.
You said what voltage you measured but not where!!
Your 2N2222 circuit is not turning the SSR off.
Compare your circuit to the one on page 4, the upper left circuit
The "bulb" you are using in not an LED but a gas discharge tube, we call them neon bulbs in the US.
I'm not sure you can use a neon bulb with an SSR of the type you have.
I'm sorry...
So can it work with a led (not a neom bulb)?
It's a socket. Where I will connect the resistance. Something like this:
I think your relay is always ON because of the incorrect transistor circuit.
The SSR requires a minimum load for it too actually conduct electricity so it looks as though it's OFF and will show 0V, without the nenon bulb connected. Once you connect the Neon bulb it will conduct and show 127V.
It should work correctly if use use the transistor circuit in the data sheet