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Housing selection
Log from tv-remote-elderly
Requirements Easily found when misplacedBig enough to hold easily but not too big that it's cumbersomeShould have a battery compartment so that unskilled personnel can replace batteries without having to open up the housingRoom enough for the necessary...

Firmware development + Front Lights case
Log from Electric mountainboard with CAN bus + Android app
I modified Android application and Control Unit firmware so that front lights can also be controlled (brightness, blinking mode) via Bluetooth. Previously only rear lights settings were being sent from the phone. Now Control Unit receives all the settings...

Assembly
Log from GNSS module 2.0 - GNSS via Bluetooth
The build of the module was pretty strait forward...with some complications. Except for one all footprints matched the parts I have. The LDO for VCC_USB was the wrong footprint, a SOT-89-3 should have been a SOT-223. I fixed this by soldering cables...

"I Have A Graaand Plan!" -- The 'Universal Formula' for a basic cyberdeck, Part 1 -- Parts, Variations, and Substitutes
Log from A Cyberdeck for the Masses
Sorry for the wait. One of the many phrases my grandmother had -- between her, my grandfather, and my mother, I've got a phrase for dang near everything! -- was... "Life is what happens when you're making other plans..." No kidding. Put differently,...

Replacement LCD and signal adaptor
Log from Toshiba T3200SXC fix/upgrade: new PSU, LCD, WiFi
I wanted to connect replacement LCD to the original LCD connector, with no "ugly hacks" like interfacing with VGA connector and other workarounds. The original LCD used 9-bit TTL RGB interface (3 pins for red, 3 pins for green, 3 pins for red), which...

Z80 Pins and Debugging
Log from 3-Chip Z80 Design
There are two ways to get to the Z80 bus for external operations. RESET* - Clears PC and sets address/data bus to Hi-ZBUSREQ* - input - Address, Data, MREQ*, IORQ*, RD*, WR* to HiZBUSACK* - output indicates that BUSREQ* signal was performed (Hi-Z busses)...

Up to date
Log from Gigatron Forth
[This post brings me up to date with the work I've done so far, and corresponds to the state in commit 0e4b928083ae69bb6ae577197ac016e93a77e80e] I've documented my design for the NEXT routines, which I've committed to Github here. It's a little sketchy,...

FAT32 File Format
Log from OSI SD Card Operating System (OSISDOS)
When you search google for FAT file format you get tons of pages on formatting disks. It's harder to pull out the detailed format of the SD card. Wikipedia to the rescue (Design of the FAT file system). A less technical FAT32 Wikipedia page is File...

ROM checksum code
Log from Re-UD-80 - a larger display for Epson PX-4 / PX-8
The 5.21E ROM works file with the current board, but the 7.11A ROM uses a different pin for the vertical sync signal. This can be fixed, but then the 5.21E ROM results in no display. Rather than fixing the hardware (with a jumper to be changed when the...

Hack Chat Transcript, Page 1
Log from 3D Printing Food Hack Chat
Dan Maloney12:00 PMOK, now that we've whet our appetites, let's dive in. I'm Dan, I'll be modding today along with Dusan as we welcome Ellie Weinstein to the Hack Chat to talk about 3D printing food. Hi Ellie, welcome aboard! Can you tell us how you...

ETTL protocol with the EOS RP & 580 EX II
Log from Wireless ETTL flash conversion
The STM32 board was just a hair bigger than the PIC, but the biggest pieces are still the power switch, channel button, & battery. The plan is just to print an L enclosure which scotch tapes around the hot shoe & sticks up. The antenna will...

Conquering Clocks and Gremlins
Log from Dreamdrive64
PSRAM Challenges The PSRAM presented numerous challenges throughout development. One issue arose from the SSI clock divider, which could only be set to even integers. When the RP2040s were originally clocked at 266MHz to meet N64 SRAM timings and the...

PPS = Picking Pins Sucks
Log from Big Ol' Modular CNC
//PIC32MX370F512H-64TQFP: // * = 5V Tolerant (? Marked Gray) // ! = RF6 Cannot be used as a change-notification! (Table 2, Note 2) // % = Pins 13-18 are programming/debugging pins... // See Note below. // // VDD = V+ // VSS = GND // SDA1 // SCL1|SCK1...

Access SD Cards from the PSoC
Log from 3-Chip Z80 Design
I'm going to create a stand-alone PSoC project to use the PSoC to read SD cards. I'm going to start with the hardware defines for this project (which should leave the Z80 hardware pins unmolested) and just not download code. For the software piece, I...

The Case of Cases
Log from D-DAQ
See Update BelowContext being more that of the puzzle of cases not one case "to rule them all," but I digress. The past week I've been going through a few catalogs to find an enclosure for D-DAQ's mainboard. Previously, the PCB's form factor was based...

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