Handheld Oscilloscope Meter Reviewed

August 14, 2024 by Al Williams 25 Comments

We live in a time where there’s virtually no excuse not to have some kind of oscilloscope. As [IMSAI Guy] shows in a recent video, for what you might expect to pay for a decent meter, you can now get one that includes a scope. There are several options out there but it is hard to know how much to spend to get the best possible product. The Zoyi ZT-702S that he looks at costs under $80. But is it worth it?

Scopes that connect to your PC are often very inexpensive. You can also find little toy scopes that use a microcontroller and a little LCD screen. Even though the specs on these are usually appalling, they will still let you visualize what’s happening in a circuit. Sure, you want an expensive bench scope with lots of channels sometimes, but often, you just need to see a signal in broad strokes. Having a scope and a meter together is very handy.

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Custom Pneumatic Cylinders Lock This Monitor Arm In Place

August 9, 2024 by Dan Maloney 8 Comments

Few consumer-grade PCs are what you’d categorize as built to last. Most office-grade machines are as likely as not to give up the ghost after ingesting a few too many dust bunnies, and the average laptop can barely handle a few drops of latte and some muffin crumbs before croaking. Sticking a machine like that in the shop, especially a metal shop, is pretty much a death sentence.

And yet, computers are so useful in the shop that [Lucas] from “Cranktown City” built this neat industrial-strength monitor arm. His design will look familiar to anyone with a swing-arm mic or desk light, although his home-brew parallelogram arm is far sturdier thanks to the weight of the monitor and sheet-metal enclosure it supports. All that weight exceeded the ability of the springs [Lucas] had on hand, which led to the most interesting aspect of the build — a pair of pneumatic locks. These were turned from a scrap of aluminum rod and an old flange-head bolt; when air pressure is applied, the bolt is drawn into the cylinder, which locks the arm in place. To make it easy to unlock the arm, a pneumatic solenoid releases the pressure on the system at the touch of a button. The video below has a full explanation and demonstration.

While we love the idea, there are a few potential problems with the design. The first is that this isn’t a fail-safe design, since pressure is needed to keep the arm locked. That means if the air pressure drops the arm could unlock, letting gravity do a number on your nice monitor. Second is the more serious problem [Lucas] alluded to when he mentioned not wanting to be in the line of fire of those locks should something fail and the piston comes flying out under pressure. That could be fixed with a slight design change to retain the piston in the event of a catastrophic failure.

Problems aside, this was a great build, and we always love [Lucas]’ seat-of-the-pants engineering and his obvious gift for fabrication, of which his wall-mount plasma cutter is a perfect example.

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All The Air Ducting Parts You Could Ever Need

August 4, 2024 by Jenny List 48 Comments

If you have ever planned an air duct or dust extraction system for your shop, you’ll know just how difficult it can be to accommodate all but the simplest of arrangements. Off the shelf systems are intended for use in home heating or other domestic systems, and offer little flexibility of choice. Of course you could 3D print an adapter or two, but [Fabian] has taken it to the next level with a comprehensive library of 3D-printable pipe system adapters and accessories. We’re not sure we’ve seen such a complete collection.

The pipes are mostly at 125 mm diameter, with the full array of elbows and joints, alongside adapters for fans and smaller pipes, and different splitter options. It becomes particularly interesting in the accessories department though, because he’s also made a set of smart addons, packing ESP32s for sensors, and even valves.

It sometimes shocks us to go into hackerspaces and see nothing in the way of extraction around tools that really need it. Airborne smoke and particulates are a proven hazard, and thus we like this project a lot. If you don’t have adequate ventilation or extraction on your bench, consider printing yourself a solution. Take a look at how one hackerspace did it.

D+ and D- wires from a USB cable connected to GPIO pins on the Pi Pico, using a female header plugged onto the jumper wires

Need A USB Sniffer? Use Your Pico!

August 3, 2024 by Arya Voronova 24 Comments

Ever wanted to sniff USB device communications? The usual path was buying an expensive metal box with USB connectors, using logic analyzers, or wiring devboards together and hacking some software to make them forward USB data.

Now, thanks to [ataradov]’s work, you can simply use a Pi Pico – you only need to tap the D+ and D- pins, wire them to RP2040’s GPIOs, and you can sniff communication between your computer and any low-speed (1.5 Mbps) or full-speed (12 Mbps) devices. On the RP2040 side, plug the Pico into your computer, open the virtual serial port created, and witness the USB packets streaming in – for the price of a Pico, you get an elegant USB sniffer, only a little soldering required.

[ataradov] also offers us a complete board design with a RP2040 and a USB hub on it, equipped with USB sockets that completely free us from the soldering requirement; it’s an open-source KiCad design, so you can simply order some sniffers made from your favourite fab! This project is a great learning tool, it’s as cheap and easy to make as humanly possible, and it has big potential for things like reverse-engineering old and new systems alike. Just couple this hack with another Pico doing USB device or host duty, maybe get up to date with USB reverse-engineering fundamentals, and you could make a Facedancer-like tool with ease.

Need to reach 480 Mbit/s? [ataradov] has a wonderful board for you as well, that we have covered last year – it’s well worth it if a device of yours can only do the highest speed USB2 can offer, and, it offers WireShark support. Want WireShark support and to use a Pico? Here’s a GitHub project by another hacker, [tana]. By now, merely having a Pi Pico gives you so many tools, it’s not even funny.

We thank [Julianna] for sharing this with us!

Custom Hat Gives Vintage Mitutoyo Calipers A New Lease On Life

August 2, 2024 by Dan Maloney 16 Comments

Metrology fans are usually at least a little bit in love with Mitutoyo, and rightfully so. The Japanese company has been making precision measuring instruments for the better part of 100 years, and users appreciate their precision almost as much as the silky smooth feel of their tools. If you can afford it, a Mitutoyo caliper is quite an addition to your toolbox.

As good as they are, though, they’re not perfect, which is what led to this clever Mitutoyo digital caliper hack by [turbanedengineer]. The calipers in question, a digital set from the early 1980s, happen to have a unique history with a tangential Hackaday angle — they belonged to [Dhaval], mechanical engineer and avid motorcyclist who happens to be the late elder brother of our own [Anool Mahidharia].

The tool, in need of a little TLC, made its way to [turbanedengineer] who first restored the broken battery contacts. Once powered up again, it became apparent that while the caliper’s native metric measurements were spot on, the internal conversion to inches was considerably off. This led [turbanedengineer] to the data port on the tool, which is intended to send serial data to an external computer for logging measurements. After a little experimentation to nail down the data format, he prototyped a tiny circuit using an ATtiny85 and an OLED display that reads the caliper data, converts metric to inches, and displays both measurements on the screen. The prototype led to a more permanent version, which cleverly sits over the original display and taps into the data port without any free wires. The video below shows the very slick results.

Our hearts go out to [Anool] and his family for their loss, and we tip our hats to [turbanedengineer] for his thoughtful and respectful hack of a storied tool. We know that anthropomorphizing tools makes no rational sense, but we think it’s safe to say that a tool like this has a soul, and it’s probably happy to be back in the game.

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USB-C Powered Hotplate Is Not For Food

July 25, 2024 by Lewin Day 18 Comments

Once upon a time, it was deemed mostly silly to try and schlep power from a computer’s ports. Then it was kind of amusing to do so with USB, and before you knew it, we were running whole laptops off what started out as a data connector. These days, it’s not unusual to run a soldering iron off USB-C, or, as [MarkTheQuasiEngineer] has done—a hotplate!

This hotplate is not for quesadillas, nor samosas. Instead, it’s a tiny hotplate for tiny reflow tasks. Given many PCBs are quite small, there’s no need for a huge hot plate to get your circuits assembled.

The device relies on metal ceramic heating elements to provide the warmth. An NTC thermistor is used for monitoring the temperature for accurate control, which is handled by the STM32 microcontroller that’s running the show. It also drives a small display indicating the mode of operation and current temperature. The STM32 controls the power going to the heating element from the USB-C feed with a stout power MOSFET.

Sadly, the project hasn’t been a complete success. With a PCB on the plate, [MarkTheQuasiEngineer] was only able to achieve peak temperatures of around 200 C. That’s not great for doing proper reflow, but it’s a start. He believes upgrading to a more powerful supply to feed the hotplate will help.

We’ve featured some other great reflow hotplates before too.
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Digitally Reading A Micrometer’s Output

July 17, 2024 by Lewin Day 11 Comments

If you’re instrumenting your machine tools, or if you’re just curious, you might want to get granular access to the output of a digital micrometer or the like. [Tommy] set his mind to figuring out the communications protocol of the ClockWise Tools dial indicator for this very purpose. And he succeeded!

Work began by finding the clock and signal lines for the gauge. With those identified, and the signals up on an AD2 logic analyzer, it was determined that once every 40 milliseconds, the device sent a data burst of six nibbles separated by 1.58 milliseconds apiece. The device communicates the absolute position of the gauge, and the data can be readily decoded with the aid of an op-amp to help boost up the 1.5-volt logic to a more reasonable level for a modern commodity microcontroller like the Arduino Nano. From there, the information can be trucked over serial to a PC, or you can do just about anything else with it besides.

We’ve seen similar hacks performed on calipers before, too, making automated measurements a breeze. If you’re working on something that needs precise measurements down to the, well… micrometer… this project might be just the thing you’re looking for.