Recent Project: The Minimum Viable Voltmeter This design has an isolated differential input and outputs a single-ended valve to your development board. The GUI is via computer or Android app. Project write up: www.oihdesigns.com/the-minimum-...

Prototyping a process controller. I have accomplished using all four outputs on a recently purchased very nice power supply. I think this justifies the cost…

No mistakes. Just “happy little accidents.”

Another example video of my DMM that automatically reports open vs closed leads in a voltmeter circuit. Note that the meter reports continuity when in parallel with the transformer, but then the ~120vac when I flip it on. (No spoken audio)

Video of my DMM showing voltage - floating leads - closed leads measurements. (No spoken audio.) #arduino #electronics

My custom DMM can now report the difference between "0 Volts - they're floating" and "0 Volts - same potential." Pretty stoked to get this working. Should save a lot of "is it off or am I measuring in the wrong place?" when troubleshooting. #arduino #electronics

Just got calibrated voltage references for my DMMs. Now I can official know how accurate they are. I also modded one of my PCBs to work with 3.3vdc boards (level shifting the SDA/SLC lines). Now have an Arduino Giga version, where I can plot the voltage readings. #Arduino #Electronics

Photo day for my most recent Arduino / XIAO board-based DMMs. My very detailed write up on how awesome this DMM is: www.oihdesigns.com/arduino-mult... I have also published my designs on GitHub: github.com/oihdesigns/M... #electronics #instrumentation

Just got the most recent Arduino/ XIAO DMM PCBs. It works! It’s precise! I’m happy! Unlike previous designs, on this one: -All the power rail conversions are done on the board instead of 3rd party breakouts. -Precision voltage references for better accuracy. -Over volt/current protection.

Trying to build a homemade EKG machine. I see a heartbeat! Yay! Now to try and control the noise…

I made a game called “Oscilloscope.” You use a joystick (smoothed by a cap) to try to match a DAC output. Rounds are one minute and it gets harder as you go. Nothing fancy but still fun Hoping it will entertain my toddlers / stealth teach my stepson electronics.

Playing with my new best $10 thermal label printer friend.

I won a trophy at work for being the most competitive.

Preparing the photos for an upcoming update to my Arduino (well, now Seeed Studio, but same MCU) super compact and useful DMM guide.

You know. It would maybe be useful if these SMD components had pre-soldered wires on them. Wait. Umm. I am not smart sometimes.

Experimenting with fancy ADCs.

It works! I'm happy! My emotions are driven by circuits functioning or not in possibly an unhealthy way! But in this case I've discovered an inexpensive IC (MIC4801) that will drive a constant 20mA (or more, but that's what I need) up to 4.8vdc off a 4.9vdc supply. Useful for instrumentation. :D

Figured out how to dim my lights from the TV. Also toggle them on and off. Pretty stoked. (No Internet involved, just an Arduino with a relay and a digital potentiometer to control the power supply.)

New redesigned multimeter PCBs arrived yesterday. The barrel jacks for input, buttons, and screen all mount directly to the board to save space and assembly time. Soldered it up and it works(!). Yay!

Most recent Arduino DMM revisions. Works pretty great. Almost done writing updated documentation on how they work.

Today’s first flight was SAC to DFW. Pretty great geologically. Yosemite, Bryce Canyon / Escalante, and Shiprock, among others. #geology

Sitting at the gate for a flight while maintenance addresses something. …They just turned the plane off and back on again as part of the troubleshooting process.

First official event half marathon* (actually a 0.58 marathon because oops) in the books. I am happy about this. The California hills are as steep as they are pretty. Feel good though.

Cool reverse engineering.

Just ran my first half marathon as training for a formal event in a week. I’ve gotten into running this past year (I’m more normally a cyclist) as a way to get my heart rate up with less overhead prep time compared to riding bikes. I am happy about this. I will now eat all the calories.

This box has the temperature min/max in different units, except the low temp is the only one where degrees don’t matter.

People who think “AI” is theft: Have you thought about where you draw line between “learning / taking inspiration from other people” and “theft” in non-AI related contexts? Is there a good definition of what counts as theft that applies equally to people or AI, beyond verbatim copying?

When you want a screen for your Raspberry Pi and you use to work in video… I think the screen has more processing power than the computer, but it works and I didn’t have to buy another thing.

I'm looking for feedback on an Arduino DMM project. I've put a lot of thought and work into developing it over the past few months and am wondering if there's a market for it if I make more. I'm wondering if there's anyone here into electronics that would be in the market for one? Key features: 1/

New version of my Arduino DMM PCB board arrived. Built the new version and pretty happy with it (~4 stable significant figures of VDC or resistance). I think it’s time to finish scraping for parts the ~5 that came before it.

My Arduino DMM works well on the R4 it was designed for, but I wanted to know if it would work with an R3 since I have some laying around the the prototype shields are piling up. Answer is yes, but only if I remove the screen to make the program smaller. Still, works with the computer GUI.

Simply problem solver electronics and Arduino project du jour: keyboard-emulating Arduino to type special characters into computers.

My Arduino DMM project (it types values into Excel for me, and is reasonably accurate) is coming along. Great project for learning instrumentation, and how to program.

Arduino DMM works! It’s surprisingly accurate! (It only has a few bugs to work out in the code!)

Getting there. No major design errors so far.

PCB I designed for an Arduino DMM shield has arrived.

Hello, I’m Nick, and I make things. My job is testing and fixing old electronics. I use to make geology field tools, and before that I was a science photographer (most people who like chemistry have seen my work). This is a current project, an Arduino that types the values into Excel for me.