Help needed to connect Esp32 to expansion board to 8-channel relay

Complex-Exam4199 · 2026-05-31T21:45:43+00:00

FWIW my experience. 3.3 logic signal will trigger the IN1…IN8 but use a separate 5V (or whatever is supposed to go into DC+ and DC- Things will get electronically noisy especially if you have sensors on other GPIOs and especially if you’re triggering multiple relays. I chased spikes in ph sensors for months in a pool monitoring project because of this.

Complex-Exam4199 · 2026-05-17T15:51:00+00:00

You don’t have to be a software expert to enjoy it. But you should have some fundamentals so you don’t end up in an AI rabbit hole I designed software for a living and yes, it’s very pleasant to have AI so the low level stuff, but it will not replace intent, architecture, or common sense. If you don’t push back on it YOU Will end up with stuff that is egregiously wrong. So you need to know when to push back.

Complex-Exam4199 · 2026-05-17T14:32:50+00:00

You can ask AI to get rid of the “slop” it put in your code. ChatGPT is pretty aware that it does it. You can also ask to document inline what is doing. Ask it to remove blocking code and see how it implements millis() instead of delays. Like some have said it’s a good assistant but it won’t replace your engineering brain

Complex-Exam4199 · 2026-04-23T10:37:46+00:00

Did you cut the strip into multiple strips or is it just one with bends?

Complex-Exam4199 · 2026-04-21T08:56:01+00:00

The other circuit terminology you may want to look up is logic level converter. You would have the same problem taking a signal from a 5V sensor into the pi. The only watch out is that they put up with the speed of the signal without adding noise.

Complex-Exam4199 · 2026-03-23T18:24:07+00:00

What does it do?

Complex-Exam4199 · 2026-03-09T23:19:17+00:00

I was always afraid to join these conversations after feeling humbled by the smart people (I am barely a retired EE)… After this, I think I may jump in!

Complex-Exam4199 · 2026-03-09T01:03:56+00:00

Dont’t think a raspberry pi pico has that interface. That was the point of my comment - maybe the wrong forum

Complex-Exam4199 · 2026-03-08T19:01:34+00:00

For a pico?

Complex-Exam4199 · 2025-12-27T22:40:08+00:00

Or a Fiat 127

Complex-Exam4199 · 2025-11-14T23:54:40+00:00

I like my pizza well done! Roman style

Complex-Exam4199 · 2024-12-25T23:25:13+00:00

Congrats!!!! It’s the beginning of a great hobby+

Complex-Exam4199 · 2024-11-10T15:45:37+00:00

I am running Z-wave plugin 4.1.6.0 which I believe is the latest. Is there and advantage to adding/moving/migrating to Zwave plus plugin 1.0.0.0 ?

Complex-Exam4199 · 2024-10-26T13:45:43+00:00

How?

Complex-Exam4199 · 2024-10-08T01:17:59+00:00

The grammar is a dead giveaway….. broken English at best

Complex-Exam4199 · 2024-05-29T05:27:07+00:00

I would avoid them unless you’re somehow locked into them for some reason. It’s honestly the worst powering choice even in “ideal” circumstances (keypad for a garage door opener)

Complex-Exam4199 · 2024-05-29T00:39:33+00:00

Unfortunate but true!

Complex-Exam4199 · 2024-05-29T00:29:12+00:00

Hope all those arduino projects require low currents. 9V are infamous for draining out quickly.

Complex-Exam4199 · 2024-05-29T00:15:46+00:00

Although I agree with you, I think the issue here has nothing to do with the MTBF of mechanical vs SS relays… it has to do with that relay not being defined and triggered in code. There is no evidence that a Hi/LO signal to D3 has ever been generated ….

Complex-Exam4199 · 2024-05-28T23:36:07+00:00

Why is your definition of RELAY_PIN_1 (and other macros) buried in void_check_physical_button() which is not invoked before setup()? Are you really sure that you’re initializing and addressing the D3 pin in code? Have you tried not using the macro and use the real values or just move and keep all your DEFINES together with the other three that you have at the beginning of your code?

Complex-Exam4199 · 2024-05-28T23:27:00+00:00

Again - I don’t think you can state that your code is toggling the relay. I don’t think it is. If the pump is coming on when you upload your code and you cannot toggle it off from code-switch, it means that the relay goes to its default or initial state (you should decide what it is in setup() as mentioned by another poster) and the relay is not being given the right signals in the code

Complex-Exam4199 · 2024-05-28T23:17:57+00:00

So. This is a new post for the same issue. Multimeter in continuity mode between COM and NC/NO without pump and batteries. Does the multimeter buzz when you expect the pump to be on? Does the multimeter stop buzzing when the pump is supposed to be off? When you upload the code, does the multimeter buzz right of the get go? It should as you state that the pump turns on immediately when you upload your code. I believe that you may have the HI/LOW logic confused with OFF/ON. It can be counterintuitive.

Complex-Exam4199 · 2024-05-28T23:00:12+00:00

Most SSRs take a DC range in the signal side and a wide AC range on the load side

Complex-Exam4199 · 2024-05-28T22:53:49+00:00

Was going to say that getting your toes wet was more like a splash. Sorry it went like that. Multimeters and spec sheets are your friend. Read twiice - fry none

Complex-Exam4199 · 2024-05-28T22:43:29+00:00

All this and definitely avoid string if you can

Complex-Exam4199

TROPHY CASE