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I have made a few different projects using the Arduino or ESP series. I look at the list of example programs (called sketches) and compare what they do to what I want, then copy and paste sections to get close to what I want, then code from there.

All of those parts will work with any Arduino as they all work on 5 volts and low current. Some of them will work with the 3.3 volts of the ESP32, some will not. The Arduinos have a current limit of about 20ma per output pin and a cumulative limit too so you can't necessarily use all the pins...

There are at least 2 kits of modules, a 37 piece one and a 45 piece set. I may be able to get a picture of the 45 piece kit too if some of you want it.

That file downloaded as soon as I clicked on it and went into my download folder. Opening it with Libre Office it looks good.

Can I guess that you bought a sensor kit for Arduino. Mine came without labels too but I found this image on another site. Maybe it will help you.

Merry Christmas. May you have a safe and productive new year.

I won't tell if you don't tell anyone that I came to this forum to learn machining techniques to repair my old farm equipment and don't often even make stuff. I took a single quarter in college on machining but...it was only one quarter and that was over 50 years ago. I may have forgotten some...

I find that the tutorials put out by Mango Jelly Solutions to be quite thorough and easy to follow. https://www.youtube.com/@MangoJellySolutions/videos You can look through his offerings and start anywhere that you have competence for. I had to start at the beginning but I am up to #25 now...

People have tested Mitotoyo calipers against cheap calipers and found that they are about equal for accuracy. Buy a $10 digital with the stainless steel body (not the carbon composite) and use them for casual measuring. Go ahead and use the sharp points to scribe on steel. Then when you need...

In my area of the US, a new MT3 center like that ranges in price from $10 to $30. Buy a new one. Regrinding will likely cost much more.

My local automotive repair shop has been complaining that replacement bearings won't fit the shaft the old one had been removed from. Sometimes it takes a couple tries to get a bearing that fits.

You probably won't be able to cut more threads with a die. There is a substantial difference in the bolt diameter beyond the threads that are already there and a die will not be able to cut threads into this larger diameter. Go to a hardware store and see if you can get concrete anchor bolts...

How do those differ from Heim joints...

In the top left of the picture there are 2 canisters, one of which has a bleed screw at the bottom. Those are filters for diesel fuel and the bleed screw is to expel water. From the top right of the filters, a rubber hose leads to the right and down slightly to the injection pump. On top of...

If you mix iron (steel?) and carbon(diamond) at high enough temperature, the carbon will dissolve into the iron, making it have a slightly higher carbon content. That's how carbon steels are made. You don't want to do that to your diamond wheel. Either run them at low speed and/or with...

You haven't said what the gears are for which might help us guide you into how to make the best use. If the gears are for a lathe to cut threads, that is different from gears to fit into a gearbox to use on a power mower.

In the Arduino IDE, click on tools and then "manage libraries". When that is finished loading, use the search bar at the top right and search for "Keypad". There will be many that show up then. Scroll down until you get to "Keypad" and install that. It should clear up that error message.

Why don't you tell us a little more about the program and the problem you are having with it. How is it programmed? Is the program secret or can you share it here?

I don't have that printer so this might be way off the wall. I changed my mini-mill to CNC and found that sometimes it would skip a step. As far as I could tell, the driver chip was overheating and shutting down for a fraction of a second. My solution was to increase the voltage and decrease...

I apologize, you are right. I had only looked at the first part where is didn't mention that the 29.5 was between centers and hadn't gone down into the rest of the ad where the specs do mention that.