Spring Clean Projects 2025 - All Comments

RE: E-Caliper with USB, LCD and Bluetooth Interfaces

dougw — Mon, 30 Mar 2026 05:26:16 GMT

There is a separate post on the Bluetooth app - because this page has no edit capability....

[mention:3d8654d095b042f9aabde683a1d73712:f7d226abd59f475c9d224a79e3f0ec07]

I do wonder why that blog can be edited, but this one can't.

RE: Vintage Dual Turntable Restoration

Jan Cumps — Thu, 24 Jul 2025 07:33:19 GMT

Vintage packaging [emoticon:c4563cd7d5574777a71c318021cbbcc8]

These are still for sale, under the Knosti brand name. Different box design and not so funky colours though.

RE: Vintage Dual Turntable Restoration

colporteur — Thu, 24 Jul 2025 02:01:57 GMT

I'm impressed with how clean the unit is. It doesn't show any years of grime it should have collected.

RE: Tap Tap Tap

shabaz — Thu, 24 Jul 2025 01:26:42 GMT

Hi Mike,

Wow great work! I don't know how I missed seeing this project earlier. I'm tempted to build one now too, maybe with N connector. Your results with the 50 ohm termination look very good.

Regarding the 100 ohm resistors, as [mention:4f57fc9d538949ad9eb336ddb9469bb8:e9ed411860ed4f2ba0265705b8793d05] mentions, if they can be shortened, it may improve things at the high frequencies. Those two resistors can be small since they don't carry a lot of current, and can then be soldered directly between center pin and the body, rather than to the screw, e.g. if those two resistors were 0603 or 0805 sized. But anyway, the results look extremely usable already.

You mentioned 100dB, 40dB is about the maximum that can be done reliably in a single metal enclosure, at least I've never managed more with DIY attenuation. Now that you have three, you could chain them to achieve 80 or 120 dB : ) I can see the need, I sometimes want 100 dB minimum too, to test radio receivers.

RE: Vintage Dual Turntable Restoration

Jan Cumps — Wed, 23 Jul 2025 16:23:40 GMT

RE: E-Caliper with USB, LCD and Bluetooth Interfaces

Andrew J — Wed, 02 Jul 2025 07:16:42 GMT

Great project Doug. Remote reading is really useful and once you can get readings out further use cases will pop out the woodwork as you go along.

RE: E-Caliper with USB, LCD and Bluetooth Interfaces

shabaz — Wed, 02 Jul 2025 00:59:52 GMT

Hi Doug,

Nice work. I'd been on the lookout for a pair of BLE calipers for ages, and I narrowed it down to two candidates.One was called S_Cal EVO, but I was quoted something ridiculous (approx. 325 USD) or Shahe 5101L (approx 60 USD).

The S_Cal EVO has spectacular BLE capability (it can operate in several modes for future-proofness) whereas the Shahe model only works one way and limited configurability which needs to be done on the instrument, not remotely.

However, despite the simpler capability, I've been really happy with the Shahe model. I was meaning to write a review but I never got around to it.

Anyway, my point was going to be, if you're looking for ideas for your app, it could be worth checking out some of the current apps documentation, in case you see anything of interest to you. For instance, one thing I'm missing (I've been meaning to implement it) is speech output of the measurements, since I'm not always able to look at the display.

RE: Danger Will Robinson: Forearm mounted Command Console

DAB — Tue, 01 Jul 2025 19:54:09 GMT

Nice build.

RE: E-Caliper with USB, LCD and Bluetooth Interfaces

DAB — Tue, 01 Jul 2025 19:48:57 GMT

Great post Douglas.

RE: Danger Will Robinson: Forearm mounted Command Console

kmikemoo — Mon, 30 Jun 2025 02:01:59 GMT

That's going to be one awesome prop when you get it done. [emoticon:1435ff2429184e17bc948e4f19178e1e] I do like the radar screen and sound.

RE: Danger Will Robinson: Forearm mounted Command Console

Matt — Sun, 29 Jun 2025 20:01:54 GMT

It's going to be great to see this project taking shape [emoticon:c4563cd7d5574777a71c318021cbbcc8]

RE: Spring Clean - Sunlight Simulating Window

DAB — Thu, 26 Jun 2025 19:43:26 GMT

Interesting build, well written.

RE: Spring Clean - Sunlight Simulating Window

kmikemoo — Thu, 26 Jun 2025 16:56:45 GMT

[mention:b7cfdb65870b4f8488b5f3b2fc17d32c:e9ed411860ed4f2ba0265705b8793d05] Brilliant. I would call this project "simply elegant". I also like its usefulness. Well done.

RE: Spring Clean - Sunlight Simulating Window

robogary — Wed, 25 Jun 2025 14:08:25 GMT

cool idea and congrats on your first E14 project submission. Its alot of fun. This spring competition has had many creative ideas.

I'm going to suggest something crazy for your next project upgrade, add a little audio to your sunlight window, for example, using a DFplayer module,

https://wiki.dfrobot.com/dfplayer_mini_sku_dfr0299

have some birds chirping at sunrise, crickets at dusk, random wildlife sounds, spooky sounds at night

RE: Spring Clean - Sunlight Simulating Window

dougw — Wed, 25 Jun 2025 05:15:39 GMT

Great idea. Thanks for posting.