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On the level
Log from The Tile Job
I caught a break on one part of the job. I know how important it is to start tiling with a level first row and adapting for out-of-level tub tops. Many videos have assured me that an existing tub is never level, and I will have to make adjustments. Well,...

GoBoard
Log from The Tile Job
Tiles get applied to some kind of surface, generically called backerboard. For a wet area like a shower, the traditional backerboard material is cementboard. It's a bit like drywall, but it's impregnated with cement (tile people call them "cementitious";...

Return to Niche Mountain
Log from The Tile Job
Finally, I've put a little mortar to work, so the tiling is truly underway. I started with the niches, but first I have to confess. Two of my specialties in projects like this are changing my mind and making obvious blunders. My original plan for...

Reading of 6502/65816 CPU Registers by a PC-based Debugger
Log from X65-SBC
Modern microcontrollers and microprocessors have built-in facilities for external debuggers to read/write registers, set breakpoints and generally fully control the CPU. This is one of the main usecases of the standard JTAG interface. The 6502 and 65816...

"It's really very impressive when you look at the disassembly."
Log from Exploring the Science Fair Microcomputer Trainer
"Decle" wrote the following interesting comment on my second Science Fair video: @decle • 7 hours ago The virtual machine and monitor within the SFMT code is implemented in about 1K (the other 1K of memory is used for the 6 built in games). It's really...

Towers of Hanoi won't fit easily
Log from Exploring the Science Fair Microcomputer Trainer
I spent a few hours trying to fit in the recursive version of Towers of Hanoi (e.g., see here: https://www.cs.cmu.edu/~cburch/survey/recurse/hanoiimpl.html): FUNCTION MoveTower(disk, source, dest, spare): IF disk == 0, THEN: move disk from source to...

ChatGPT 3.5 programs the Science Fair (in assembler)
Log from Exploring the Science Fair Microcomputer Trainer
Not entirely unexpected, and not entirely serious either, but nonetheless - impressive! While it mostly failed to translate its generated assembly code into machine language (It's not a good assembler), the delivered assembly code actually worked in...

Printing... printing... printing and new lens
Log from Modular Pi Cam
I've been printing out the different camera module sliding plates and after I add the screw holes/mounts for the body, will start printing that too. Major dimensions are 5.25" x 1.5" It is quite roomy inside Will add the stenciling last since the letters...

Decision on the Sensors
Log from Automated Rabbit Hutch Door
As mentioned in the last log, Thermopile matrix sensors sound like a very promising idea so did a short search wich ones would be available (see table below). But the would require at least some kind of image recognition which makes them complex to use....

Photos
Log from HP437B power meter teardown
Front view: Rear view: Bottom view, feet; Two screws were hidden under the round calibration labels. Bottom view, two rear screws hidden under the feet: Side view, pull the sticky bits off: Complete top board: Ooh look, a 68B09E. The 63B40 is a programmable...

Laser marking test
Log from Claymore - SLS 3D printer using polymer clay
Kinematic systemRecently (early March 2024), I built the kinematic system to move the laser head and the print bed.The laser moves in X (left-right) axis, and the bed moves in Y (forward-backward) and Z (up-down) axis.All the axes are driven by cheap...

I didn't choose the MCU ... it chose me!
Log from TI-57 Programmable Calculator Hardware Retrofit
I like the STM32 ARM cortex MCU family. They are well documented, readily available, and cheap 'breakout boards' for them abound. The MCU retrofit must fit nicely in the space of a 28-pin 0.6" pitch DIP, so package size is key. The STM32F103 is...

Driving the Display
Log from TI-57 Programmable Calculator Hardware Retrofit
The TI-57 has a multiplexed 12-digit common cathode LED display. The corresponding 8 segments of all 12 digits are connected together; sort of. It turns out that TI economized on IC package pins by ”doubling up” the decimal point segment...

Day 2 (part 1) - Fabric, Access, Workshop and LEDs!
Log from Cultural Integrity (at the Dethrone Hackathon)
The big hacker day was upon us and the gears were in motion! Julia jumped into action during morning solo hacker time. She went to the Mission Fabric Outlet store to find our throne-worthy textiles, as well as coordinating with a participant...

Can I control other GPIOs while OSPi is running?
Log from MQTT hack for OpenSprinkler OSPi
Yes.As I use Debian bookworm with kernel 6.1 I can control the GPIOs without using WiringPi (which as I understand is used by OSPi). I wrote a short python script to blink LEDs on GPIO 16 and 20. These GPIOs are not used by OSPi by default. As I understand...

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