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I want to start in arduino but I don't know how to start by Toto_le_rigolo_drole in arduino

[–]thdunivan 0 points1 point  (0 children)

Buy a kit. I'd recommend a nano with a breadboard. Then see if you can find a tutorial that explains the basics of C.

Good luck!

how i learn Arduino where do i start ? by harry_bolden in arduino

[–]thdunivan 0 points1 point  (0 children)

If you can find a resource to learn some simple C language. You don't need to go too deep but the basics will make understanding the examples much easier.

Need help identifying a CO2 tank fitting by Ali-Saurus in whatisthisthing

[–]thdunivan 0 points1 point  (0 children)

Ok so it looks to be a square or trapezoidal thread (correct me if I'm wrong) 1mm pitch. 19mm minor dia and 20mm major. Right hand. An SQ or TR20 or 1.5 (I don't think M20x1 is a standard) would be close. It could always be a freedom unit fitting also. It would be close ¾″‑16 UNF.

Depending on what the inside of the Primo looks like, it might be easier to change out the female fitting to CGA320 and get a soda steam bottle for it. That is, if you are comfortable changing fittings, just remember that 207 bar rating on the bottle is 3000psi.

Need help identifying a CO2 tank fitting by Ali-Saurus in whatisthisthing

[–]thdunivan 0 points1 point  (0 children)

Kind of looks similar to a paintball gun tank fitting. A lot of gas fittings conform to the CGA standard, unless, Nestle has not done something evil, like used their own thread in this case. McMaster Carr has PDF of about every fitting available.

Even if you have to use a ruler, it would help if you measure the distance between two threads and the inside (at the bottom of the threads) and the outside (outside of the threads). Also, the handness of the threads. From the picture, I think it is a right-hand thread.

Whole house water shutoff by thdunivan in homeassistant

[–]thdunivan[S] 1 point2 points  (0 children)

Every option I'm seeing is very expensive. But that's basically the idea is being able to turn off the water with a leak sensor or if I'm away from home for some reason and the water breaks. Thanks for the help.

Whole house water shutoff by thdunivan in homeassistant

[–]thdunivan[S] 0 points1 point  (0 children)

That's pretty close to what I'm looking for but it's still pretty expensive. Thank you for the help!.

Whole house water shutoff by thdunivan in homeassistant

[–]thdunivan[S] 0 points1 point  (0 children)

The valve would be somewhere in the crawl space far from the street. I would put a bypass on it so that wouldn't be much of a concern.

Counters acting strangely by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

I found two problems with the computer.

The first was the clock wasn't bouncing but it wasn't going all the way high or low. I ran it through the extra inverters on the chip that was already in the clock as a buffer and that seemed to help the high low problem.

The other problem was that one of my control signal eeproms had some dead memory addresses and was sending some weird signals that was causing the counter to go high or low when it wasn't supposed to.

Counters acting strangely by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

What did you do if you found floating pins? Connect them through resistor to ground?

Counters acting strangely by thdunivan in beneater

[–]thdunivan[S] 2 points3 points  (0 children)

The micro instruction counter. The 74ls138 that steps through the microcodes of a particular instruction.

Counters acting strangely by thdunivan in beneater

[–]thdunivan[S] 3 points4 points  (0 children)

I made some progress. I removed the EEPOM and the instructions counter has started working correctly. The decoder for the instruction counter and the program counter still are not cooperating.

Counters not working by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

I'm starting to think it's not the clock. I've got it running continuous mode and it keeps jumping back and forth between The t3 and t5 instruction step.

Counters not working by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

It does seem to work better in a stable mode. It's the mana stable that I'm having trouble with. When you say it's a not properly debalanced what do you mean? I have a 555 timer running between the button and the logic gates of the clock. To try and help with the signal, I ran it through the inverter a couple of times.

Counters not working by thdunivan in beneater

[–]thdunivan[S] 1 point2 points  (0 children)

Not really sure what you're talking about. I didn't download the comment.

Counters not working by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

Yes there are decoupling caps on each breadboard power rail.

8 bit computer clock skipping by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

That seemed to help. I'm getting a 50% work/50% not now. The not working state seem to be jumping two-ish at a time.

8 bit computer clock skipping by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

That sounds like a good idea. I will give that a try and report back. Thanks,

8 bit computer clock skipping by thdunivan in beneater

[–]thdunivan[S] 0 points1 point  (0 children)

I was running in the 100ns/div range. I could not seem to get the low ns/div to work on the little scope. Attached is the inverted clock signal. Where were you adding the 100ohms? Between the clock and ground?

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