Level shifting problem

[Watcher]

oh?

[jim-p]

To improve your average.

[ShermanP]

Is OSHPark a good alternative for boards for people in the US?

[LarryD]

@Watcher

Which ones do you recommend besides the above?

Digital

Share tips you have come across

Use Single or Dual Logic Gates in Your Projects With reference to Post #975 and the Link below: Selection Tables Very often, we need only one or two logic gates to make our circuits work. We can avoid the larger versions of these I.C.s by using small SMD single/dual logic gates. SOT23-5/6 and SOT-353-5/6 form factors are available and can still be managed with manual soldering, as seen in the previous post. Below are gates I often use. [Gates] Many other logic families and g…

Linear

LMV321 Single supply OP Amp
and
TL331 Comparator

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Edit

FYI

[hammy]

@LarryD

Nice LED display plugged into the solderless breadboard.

Yep , use that a lot !!!

Another example here - making an analog speedo with inductive sensor input - to design the signal conditioning - breadboard that part , then the display part , then go to PCB !

It’s not just for hardware , you can checkout if your coding is likely to work

[LarryD]

• Blue breadboard, you have exposed your age

• I’ve started using this old man wiring error protection idea.

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Lets Protect Our Arduino From Us This has been covered a few times. The following will show how we can save our Arduino from ourselves. There are quite a few new Arduino users that damage their Arduinos by accidentally shorting output GPIO pins. Suggest new users (and some of us oldsters too) use the following technique to prevent output GPIOs Arduino pin damage. [A] [B] [C] [D] [E] [F] [G] [H] [I] Edit [LED Display X10 with Prewired Jumpers A] [LED Display X1…

EDIT

I use a prewired header for the LED display PCB:

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OP, You may find this useful:

Share tips you have come across

Magnetic Hold Down Clamp Soldering Method part 2 Make a Fulcrum Assembly to lift the Clamping Arm At its simplest, the Clamping Arm can be lifted with your thumb and index finger. If you use a simple Fulcrum Assembly, you will find the soldering process goes a lot faster and the process is easier on your wrist. Suggest you make an ABS plastic assembly as seen in the images, however, I have used a wooden version for years. See the attached images to see how the Fulcrum Assembly is used…

April 2, 2024

[ShermanP]

It appears that for level shifting in particular, the LV1T parts would be best.

https://www.ti.com/lit/ds/symlink/sn74lv1t34.pdf

[hammy]

@LarryD

Blue breadboard, you have exposed your age

Yep … still the best board I have too🤣
I have used plastic chopping boards or pieces of ply to mount Arduinos, switches bread boards etc to stop it all falling apart .
Those little boards with a row of leds are good

[camsysca]

@hammy

I have used plastic chopping boards or pieces of ply to mount Arduinos, switches bread boards etc to stop it all falling apart .

I've also temporarily hot glued a board on leads to my desktop(two dabs, opposite corners, for the board, so I could plug cables into it without them dragging it to the floor. Secondary components got a dab each. Pries up later without a problem, but in the meantime, not going anywhere!

[Watcher]

New PCB arrived, built and tested. Everything works as expected now.
For the benefit of anyone reading this post later, below is the complete schematic:

[ShermanP]

It's nice when things work.

What is the power input voltage ("DC")?

[Watcher]

@ShermanP

What is the power input voltage ("DC")?

14-20 V

Also made some other changes compared to the original design, for example the RGB Led that emits different colors to indicate different conditions, ie WiFi Connected, A/C online, MQTT server error etc..