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Sensor Design
Log from Seismometer
Please forgive me. It's been nearly 4 years since I worked on this problem. A lot of the details have probably been forgotten in the interval. There is a lot of ground to cover, so this might be a very long log entry. Initially I thought that the way...

Camera settings and taking the picture!
Log from Perfect product pictures on a budget
Introduction Let me say a few important things here: your camera doesn't matter (to an extent, see below for details)the software you need is free (famous Photoshop not needed!)correcting your out-of-cam pics is only a matter of a few seconds per pictureonly...

Joules to photons. Finally.
Log from Coin Cell Challenge...
Ok, sorry about the clickbait title; who can resist the promise of LEDs? I promise a photo of a lit LED in this log, so you don't go home empty handed. This log is a quick one to introduce an intriguing potential alternative to coin cells. I have...

First prototype and test hardware
Log from Prism
The basic building blocks of an EVSE are pretty standard. We start, of course, with a power supply for the low voltage circuitry. While this may seem a very simple and straightforward piece to solve, there are a lot of variables to consider: we need...

Revision 1
Log from Interactive Electronic Hockey Targets
HardwareBased on my prototyping and testing, I designed and built a first prototype. This version used an ESP32 as the microcontroller and wireless connectivity, a LIS3DH accelerometer for impact sensing, and a AAA size lithium ion cylindrical cell for...

Post Mortem
Log from My CP/M Version 1A
Post Mortem Well, this is the end of this project. The machine works as expected. One other problem was that I lost my boot sector twice. So I have implemented Boot Sector (for the first 8kb) Software Protection. What caused it? I don't know (other than...

Designing on the run, sourcing parts, 1
Log from DIY 6-digit multimeter
Designing something from existing parts is not as trivial process as it may look. Unlike traditional design, where I start by selecting components I needwhere I identify the main components dictated by important features of things to be designed and...

Extra Ports?
Log from Vintage Z80 palmtop compy hackery (TI-86)
I decided to do a port-read of ports higher than the 8 reverse-engineered and documented by others. I found something interesting... while mostly they seem to repeat after every eight steps (which would make sense if they just used a 3in-8out demux)...

Overclocking and Undervolting the 65C02 Family
Log from Herring 6502 Computer
Herring Backplane 3.3vUntil recently, I have been maintaining two versions of the Herring system - one with 5v-compatible components and another for 3.3v. The backplane regulates the 12v DC input so it's easy enough to install a 5v regulator in one and...

Sometimes You Have To Rebuild Everything
Log from Mackerel 68k Computer
Second handmade revision of Mackerel on a backplane The rat's nest of wires I've been calling the Mackerel 68k has been completely rebuilt. It's now a slightly smaller rat's nest, but it's on a much nicer backplane with more thought given to the bus...

Design thoughts snapshot
Log from Ventbot: warm side cool, cool side warm
This is a recap of my thinking about the design of this project. Some of it I've mentioned or hinted in earlier project logs, and some has lived only in my tiny brain.For the software framework, I plan to use ESPHome. I've used that already for several...

Integrating the ADC
Log from NeoPixel Theremin
In the previous project log I settled on a MUX, an ADC with 8-bit parallel output, and a shift register. Something like this: For the ADC I've selected the ADC1175 by Texas Instruments, an 8-bit, 20 MSPS ADC with parallel output. It's available in a...

Modelling the Pt1000 temperature sensor & building a thermostat
Log from TAST-E, the robot with a sense of taste and smell
The characteristic curve of the Pt1000 is as follows: Fig. 1 It can be assumed to be a good approximation of a straight line. However, we can do little with this, as the microcontroller measures the voltage at the output of the opamp. The microcontroller...

Blackberry Curve USB keyboard
Log from weekend novelty projects
[hooray for vertical videos... ] I had a Blackberry Curve a number of years ago and liked the keyboard. Yay tiny buttons! Sadly, I didn't see @WooDWorkeR's #PIMP (Personal Information Manager & Pager) project until I'd already torn into...

Display Board - Design Notes Part 1
Log from D-DAQ
I've talked at length about the mainboard for D-DAQ because that is where so much has to go right for anything else to be functional. In order to do something with D-DAQ so it's not a lifeless brick, there needs to be a way to see what's going on (duh!)...

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