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Welcome @friedguy, sounds like a lot of wiring involved.

I'm working with five Arduino IDE, C/C++, programs on the four ESP8266s and an ESP32, and one Python program on the Pi. I'm running the Pi as a MQTT broker/server and Node-RED to tie everything together.

So are parts of mine. We need to talk about time and how it's handled on the various microcontrollers, SOCs (System On Chip) and SBCs (Single Board Computer).

Welcome @ToFarGone , we've just begun... and eventually I will get to coding.

I understand. But sooner or later you may require one or two.

Much heat coming off those solid state relays? I was thinking about those instead of relays but was concerned about the heat when carrying a 15A load. The ones I considered required large heat sinks.

Think of them as Legos.

The enclosures and cables and labeling can get costly but makes it safer to use.

Not necessarily, there are bidirectional level shifters that convert signals from 3.3Vdc to 5Vdc and back. Signals not voltages.

I got kits mailed to me when I was eight or ten, one a month for several months. Neat projects like a cat's whisker radio, wind your own motor and run it on a lemon, nickel plating a penny, that kind of kit. I hadn't thought about those... I guess that was my first introduction to electricity...

With the Arduino Uno or Mega or other 5Vdc based microcontrollers. The two ESPs that I use and the Pi are 3.3V.

Welcome and thanks, @ChiefRunningPhist

Sampling too fast for the resolution maybe? Here's a guide for DS18B20 temperature sensor with Arduino board... While I've never used one, after some quick reading, it is my understanding that the 4 pin boards use the I2C protocol where as the 6 pin boards use the I2C or SPI protocols. The...

There are a lot of sources of information out there and one of my favorites is Random Nerd Tutorials. From Google: "Random Nerd Tutorials is a blog where we share electronics projects, tutorials and reviews. We help makers, hobbyists and engineers build electronics projects. We make projects...

Thanks and welcome @Dougnsalem. I think this will end up being an informative thread, hopefully deserving of your time.

That tray helps me keep things together when the kitty comes around. Here, she uses my Pi as a heated pillow... until the new dual fan case gets here. She'll learn quick. :) I built a lot of Arduino stuff just on the calendar on the desktop. The tray comes with the screws to mount either an...

I meant to tell you, I believe it's the other way around, Chrome is a commercialized version of open-source Chromium. I'm a firm believer in supporting the local economy but all of the Radio Shacks are gone from my zone. Try to find a PZEM-004T-100A-R3 in your zone. Amazone comes in real handy...

Yeah, I shoulda done that! I didn't know wether to insert the full photo or the thumbnail. What do you think? Too big?

Welcome Mak'er Grow, ilovereggae, OldMedUser and anyone else viewing this. Thanks.

First relays... no mains power (120Vac 15A in my zone) was ever applied to the relay module shown on the Arduino setup above nor will it ever be. While the relays are rated for 10 amps at both 125Vac and 250Vac, and 30Vdc, the electrical connection between the board and mains are rated at less...