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Nothing wrong with working on a component level, heck, @OldMedUser probably makes his own resistors, LOL. You guys talk all the component stuff you want, I'm gone for the evening.

What are you smoking? ;)

Too late now. ;) Glad you found that diode. Really!

Nice work on transformers. I was referring specifically to isolation transformers which can save one's life. @OldMedUser has a variac though I don't know if it isolates the output or not. I hope not to get into mains too much as too much chance of injury. The only transformers I've had to use...

Here's my prototype for the black box shown earlier. On the left of the breadboard, is a self contained 5Vdc and 3.3Vdc power supply and the DHT22. On the right is an ESP8266-12E. In the middle is a multiplexer that allows eight adc devices on the 8266, which only comes with one, and an eight...

Thanks for this great prototyping example and explanation. To be a little more specific, when working with mains power, use an isolation transformer such as this, true isolation transformer. There are a lot of look-alikes that are not true isolation transformers like this, non-isolated...

The difference between a SOC, and SBC. The Pi/Raspbian comes with LibreOffice installed, a suite that includes LibreCalc which you might make use of. Your chart might fit in the Pi a lot easier than in the esp32. You mean a web page hosted by the esp32?

Idk Chief, maybe someone has a suggestion? That's kind of what I'm doing only I'm using a Pi to do the computing required to control everything, as well as data storage on a 32G usb drive, and display and user interface.

Nice kit.

That can make trying to control things really hard to do, having to push a button every time the timer turns on. Or a reset. Maybe a plunger type solenoid over the button... :)

No, you got it right, you do both. On the green boards above, you wire between components, the brownish board has groups of five holes connected together to make interconnections easier. They wire the same way, just uses less wiring. On the full strip board, not shown, you do have to cut the...

Cool (40F) project @spek9. ;) I got it, and I'm the same way...

Thanks and welcome @HolyAngel. No, but I'll take a look... it goes on forever but something to look at guys.

Welcome @spek9 and thanks for that tip. I've used simple voltage dividers while shifting individual 3.3Vdc digital signals to 5Vdc. Thanks, we can use the input/help/expertize. We are all on a path of knowledge leading towards better cannabis cultivation.

Though many years ago I etched my own boards, in the last year, I've used boards like this. You could get a kit of 50, in different sizes, from you know where. Just look at the different sizes, you could use the smallest for your 4 component circuit. I'm going to try this type of board next...

It is good to see more people, isn't it? and thanks, I seldom put the money into the extras like cases and lasered cutouts and labeling, but I want to take this project all the way.

Good to have another Pi fan, welcome @TrippleDip. That's a nice interface, Python? I'm interested but it's probably too early. How many lines of code? Pictures? You must be into this stuff more than I am! Is max595 a 74HC595? and I know what a 555 is... As far as NTP, Network Time Protocol...

Get to know your Mega first and I'll show you. Try an Amazone search for PCB breadboard, I'm going to try these next as I think they will be easier to work with. Node-RED is a programming tool that I use to connect everything wifi, together. It's probably on your Pi.

I'm retired... and my system is simple, ESP8266s instead of Arduinos.

I'm using a DHT22 for temperature and humidity, and a DFRobot Gravity: Analog Infrared CO2 Sensor. I'm using capacitive soil sensors. In progress is adding a PZEM-004T-R3 to each outlet box to track electrical consumption.